DDC SVC MAN 0055 MB 900 MBE 926 Manual

User Manual: MB-900

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MBE 900 OPERATOR'S GUIDE

To the Operator

This guide contains instructions on

the safe operation and preventive

maintenance of your Detroit Diesel

MBE 900 engine. Maintenance

instructions cover routine engine

services such as lube oil and ﬁlter

changes in enough detail to permit

self-servicing if desired.

The operator should become familiar

with the contents of this guide before

operating the engine or carrying out

maintenance procedures.

Power-driven equipment is only

as safe as the person operating the

controls. You are urged, as the

operator of this diesel engine, to keep

ﬁngers and clothing away from the

revolving belts, drive shafts, etc. on

engine installation.

Throughout this guide CAUTIONS

regarding personal safety and

NOTICES regarding engine

performance or service life will

appear. To avoid personal injury and

ensure long engine service life, always

heed these instructions.

Whenever possible, it will beneﬁt you

to rely on an authorized Detroit Diesel

service outlet for all your service

needs from maintenance to major

parts replacement. Authorized service

outlets worldwide stock factory

original parts and have the specialized

equipment and experienced, trained

personnel to provide prompt

preventive maintenance and skilled

engine repairs.

The information and speciﬁcations

in this publication are based on the

information in effect at the time of

approval for printing. Contact an

authorized Detroit Diesel service

outlet for information on the latest

revision. The right is reserved to

make changes at any time without

obligation.

NOTICE:

Coolant must be inhibited with

the recommended Supplemental

Coolant Additives (SCA) listed in

this guide. In addition, the engine

can be equipped with a coolant

ﬁlter/inhibitor system as an installed

option or as an after-sale item.

Failure to check and maintain SCA

levels at required concentrations will

result in severe damage corrosion

to the engine cooling system and

related components.

Trademark Information

Detroit Diesel®, DDEC®, and

Diagnostic Link® are registered

trademarks of Detroit Diesel

Corporation. Nexiq™ is a trademark

of Nexiq Technologies, Inc. All other

trademarks are the property of their

respective owners.

All information subject to change without notice. (Rev. 04/08) i

ii All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

TABLE OF CONTENTS

CAUTION SUMMARY .......................................................................... 1

ENGINE OPERATION ..................................................................... 1

PREVENTIVE MAINTENANCE ....................................................... 2

ELECTRICAL SYSTEM ................................................................... 4

COOLING SYSTEM ......................................................................... 6

AIR INTAKE SYSTEM ...................................................................... 6

FUEL SYSTEM ................................................................................ 7

COMPRESSED AIR ......................................................................... 9

LUBRICATING OIL AND FILTERS .................................................. 9

IDENTIFICATION ................................................................................. 10

PERSONNEL REQUIREMENTS ..................................................... 13

ENGINE CONVERSIONS AND MODIFICATIONS .......................... 14

GENERAL VIEW OF THE MBE 900 ENGINE ................................. 14

ENGINE IDENTIFICATION NUMBER ............................................. 21

DESCRIPTION OF THE ENGINE .................................................... 22

EXHAUST GAS RECIRCULATION ............................................. 23

EXHAUST BRAKE/CONSTANT-THROTTLE VALVES,

OPTIONAL ....................................................................................... 24

ELECTRONIC ENGINE CONTROL SYSTEM ................................. 25

DDEC-ECU .................................................................................. 26

DDEC-VCU .................................................................................. 27

SENSOR LOCATIONS .................................................................... 28

OPERATION ........................................................................................ 31

BEFORE STARTING THE ENGINE ................................................ 31

CHECKING THE BATTERIES ..................................................... 31

CHECKING THE OIL LEVEL ....................................................... 32

CHECKING THE COOLANT LEVEL (COLD CHECK) ................ 33

ADDING FUEL ............................................................................. 33

PRIMING THE FUEL SYSTEM ................................................... 33

STARTING THE ENGINE ................................................................ 33

CHECKING THE COOLANT LEVEL (HOT CHECK) .................. 34

STARTING AN ENGINE THAT HAS NOT BEEN RUN FOR AN

EXTENDED PERIOD .................................................................. 35

All information subject to change without notice. (Rev. 04/08) iii

TABLEOFCONTENTS

MONITORING ENGINE OPERATION ............................................. 36

BATTERY CHARGE .................................................................... 36

OIL PRESSURE .......................................................................... 36

EXCESSIVE IDLING ................................................................... 37

CHANGING THE IDLE SPEED ....................................................... 37

SHUTTING DOWN THE ENGINE ................................................... 37

SHUTTING DOWN AFTER HARD OPERATION ........................ 37

EMERGENCY RUNNING MODE .................................................... 38

STOP ENGINE OVERRIDE OPTION .............................................. 38

COLD WEATHER OPERATION ...................................................... 39

WINTER FRONTS ....................................................................... 39

CLEANING AND STORAGE ............................................................... 40

CLEANING THE ENGINE ................................................................ 40

HIGH-PRESSURE CLEANING EQUIPMENT ............................. 40

CLEANING THE COOLING SYSTEM ............................................. 40

DEGREASING ............................................................................. 41

STORAGE ........................................................................................ 42

TROUBLESHOOTING ......................................................................... 43

EMERGENCY STARTING ............................................................... 43

TROUBLESHOOTING THE ELECTRONIC ENGINE CONTROL

SYSTEM .......................................................................................... 43

GENERAL TROUBLESHOOTING ................................................... 43

SERVICE PRODUCTS ......................................................................... 56

DIESEL FUELS ................................................................................ 56

FLOW IMPROVERS .................................................................... 56

KEROSENE ................................................................................. 56

ENGINE OILS .................................................................................. 57

EGR ENGINES ............................................................................ 57

NON-EGR ENGINES ................................................................... 58

SYNTHETIC OILS ....................................................................... 58

COOLANT ........................................................................................ 58

FULLY-FORMULATED ANTIFREEZE ......................................... 58

WATER ........................................................................................ 59

COOLANT SPECIFICATIONS ..................................................... 59

COOLANT CONCENTRATION ................................................... 59

iv All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

SUPPLEMENTAL COOLANT ADDITIVES FOR FULLY

FORMULATED COOLANT .......................................................... 60

DROPOUT ................................................................................... 61

DISPOSAL ................................................................................... 61

COLD WEATHER PRODUCTS ....................................................... 61

WINTER-GRADE DIESEL FUEL ................................................. 61

LOW-VISCOSITY ENGINE OIL ................................................... 62

WINTER COOLANT ANTIFREEZE PROTECTION .................... 62

BATTERIES ................................................................................. 62

TECHNICAL DATA .............................................................................. 64

ENGINE DATA FOR EGR ENGINE ................................................. 65

ENGINE DATA FOR NON-EGR ENGINE ........................................ 66

TESTING AND ADJUSTING VALUES ............................................. 67

MAINTENANCE ................................................................................... 68

SCHEDULED INTERVALS .............................................................. 68

MAINTENANCE SCHEDULE TYPES ......................................... 68

SEVERE SERVICE ................................................................. 68

SHORT-HAUL ......................................................................... 69

LONG-HAUL ........................................................................... 69

OPERATING HOURS VS. FUEL CONSUMPTION (OIL DRAIN

INTERVAL ONLY) ................................................................... 69

UNIMOG .................................................................................. 69

MAINTENANCE SCHEDULE AND INTERVAL

OPERATIONS ......................................................................... 69

MAINTENANCE INTERVALS ................................................. 69

MAINTENANCE OPERATION SETS ...................................... 70

SCHEDULE USE ............................................................................. 70

MAINTENANCE TABLES AND GRAPHS ........................................ 71

REQUIRED MAINTENANCE OPERATIONS ................................... 79

ENGINE INSPECTING ................................................................ 79

VALVE LASH CHECKING AND ADJUSTING ............................. 79

GAINING ACCESS TO THE VALVES ..................................... 80

METHOD ONE: ADJUST EACH CYLINDER IN FIRING

ORDER ................................................................................... 81

METHOD TWO: ADJUST ALL VALVES USING TWO

CRANKSHAFT POSITIONS ................................................... 82

CHECKING VALVE LASH ....................................................... 83

All information subject to change without notice. (Rev. 04/08) v

TABLEOFCONTENTS

ADJUSTING VALVE LASH ...................................................... 83

RESTORING THE VEHICLE TO OPERATING CONDITION .. 84

FUEL PREFILTER ELEMENT CLEANING ...................................... 84

MAIN FUEL FILTER ELEMENT CHANGING .................................. 86

ENGINE OIL AND FILTER CHANGING .......................................... 87

OIL CENTRIFUGE ....................................................................... 90

COOLANT CONCENTRATION CHECKING .................................... 91

COOLANT FLUSHING AND CHANGING ........................................ 93

COOLING SYSTEM INSPECTING .................................................. 95

CUSTOMER ASSISTANCE ................................................................. 96

WORKING WITH DDC SERVICE OUTLETS .................................. 100

STEP ONE ................................................................................... 100

STEP TWO .................................................................................. 100

STEP THREE .............................................................................. 101

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900

ENGINES USED IN ON-HIGHWAY VEHICLE APPLICATIONS ......... 102

TERMS OF COVERAGE ................................................................. 102

USES ........................................................................................... 102

DEFECTS .................................................................................... 102

REPAIRS ..................................................................................... 102

WARRANTY PERIOD .................................................................. 102

LIKE REPLACEMENT ENGINE .................................................. 103

SERVICE SUPPLIES .................................................................. 103

ENGINE REMOVAL AND REINSTALLATION ............................. 103

THIS WARRANTY DOES NOT COVER: ......................................... 103

REPAIRS DUE TO ACCIDENTS, MISUSE, STORAGE DAMAGE,

NEGLIGENCE OR CERTAIN MODIFICATIONS ......................... 103

MAINTENANCE ........................................................................... 104

INCIDENTAL OR CONSEQUENTIAL DAMAGES ...................... 104

OTHER LIMITATIONS ................................................................. 104

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900

ENGINES USED IN SCHOOL BUS APPLICATIONS ......................... 105

TERMS OF COVERAGE ................................................................. 105

USES ........................................................................................... 105

DEFECTS .................................................................................... 105

REPAIRS ..................................................................................... 105

vi All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

WARRANTY PERIOD .................................................................. 105

SERVICE SUPPLIES .................................................................. 106

LIKE REPLACEMENT ENGINE .................................................. 106

ENGINE REMOVAL AND REINSTALLATION ............................. 106

THIS WARRANTY DOES NOT COVER: ......................................... 106

REPAIRS DUE TO ACCIDENTS, MISUSE, STORAGE DAMAGE,

NEGLIGENCE OR CERTAIN MODIFICATIONS ......................... 106

MAINTENANCE ........................................................................... 107

INCIDENTAL OR CONSEQUENTIAL DAMAGES ...................... 107

OTHER LIMITATIONS ................................................................. 107

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE

900 ENGINES USED IN FIRE TRUCK OR CRASH VEHICLE

APPLICATIONS ................................................................................... 108

TERMS OF COVERAGE ................................................................. 108

USES ........................................................................................... 108

DEFECTS .................................................................................... 108

REPAIRS ..................................................................................... 108

WARRANTY PERIOD .................................................................. 108

LIKE REPLACEMENT ENGINE .................................................. 109

SERVICE SUPPLIES .................................................................. 109

ENGINE REMOVAL AND REINSTALLATION ............................. 109

THIS WARRANTY DOES NOT COVER: ......................................... 109

REPAIRS DUE TO ACCIDENTS, MISUSE, STORAGE DAMAGE,

NEGLIGENCE OR CERTAIN MODIFICATIONS ......................... 109

MAINTENANCE ........................................................................... 110

INCIDENTAL OR CONSEQUENTIAL DAMAGES ...................... 110

OTHER LIMITATIONS ................................................................. 110

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900

ENGINES USED IN UNIMOG APPLICATIONS .................................. 111

TERMS OF COVERAGE ................................................................. 111

USES ........................................................................................... 111

DEFECTS .................................................................................... 111

REPAIRS ..................................................................................... 111

WARRANTY PERIOD .................................................................. 111

LIKE REPLACEMENT ENGINE .................................................. 112

SERVICE SUPPLIES .................................................................. 112

ENGINE REMOVAL AND REINSTALLATION ............................. 112

All information subject to change without notice. (Rev. 04/08) vii

TABLEOFCONTENTS

THIS WARRANTY DOES NOT COVER: ......................................... 112

REPAIRS DUE TO ACCIDENTS, MISUSE, STORAGE DAMAGE,

NEGLIGENCE OR CERTAIN MODIFICATIONS ......................... 112

MAINTENANCE ........................................................................... 113

INCIDENTAL OR CONSEQUENTIAL DAMAGES ...................... 113

OTHER LIMITATIONS ................................................................. 113

viii All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

CAUTION SUMMARY

The following cautions must be

observed by the operator of the

vehicle or equipment in which this

engine is installed and/or by those

performing basic engine preventive

maintenance. Failure to read and heed

these cautions and exercise reasonable

care for personal safety and the

safety of others when operating the

vehicle/equipment or performing basic

engine preventive maintenance may

result in personal injury and engine

and/or vehicle/equipment damage.

Engine Operation

Observe the following cautions when

operating the engine.

FIRE

To avoid injury from ﬁre, keep all

potential ignition sources away

from diesel fuel, including open

ﬂames, sparks, and electrical

resistance heating elements. Do

not smoke when refueling.

PERSONAL INJURY

Diesel engine exhaust and some

of its constituents are known to

the State of California to cause

cancer, birth defects, and other

reproductive harm.

□Always start and operate an

engine in a well ventilated

area.

□If operating an engine in

an enclosed area, vent the

exhaust to the outside.

□Do not modify or tamper

with the exhaust system or

emission control system.

All information subject to change without notice. (Rev. 04/08) 1

CAUTION SUMMARY

Preventive Maintenance

Observe the following cautions when

performing preventative maintenance.

HOT OIL

To avoid injury from hot oil, do

not operate the engine with the

rocker cover(s) removed.

PERSONAL INJURY

To avoid injury from slipping and

falling, immediately clean up any

spilled liquids.

USED ENGINE OIL

To avoid injury to skin from

contact with the contaminants in

used engine oil, wear protective

gloves and apron.

PERSONAL INJURY

To avoid injury when working

near or on an operating engine

equipped with an hydraulic

clutch fan, remove loose items

of clothing and jewelry. Tie back

or contain long hair that could

be caught in any moving part

causing injury. The hydraulic fan

may start without warning.

HOT COOLANT

To avoid scalding from the

expulsion of hot coolant, never

remove the cooling system

pressure cap while the engine is

at operating temperature. Wear

adequate protective clothing

(face shield, rubber gloves,

apron, and boots). Remove the

cap slowly to relieve pressure.

2All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

PERSONAL INJURY

To avoid injury from the

projection of tools or other

objects that may fall on or behind

the vibration damper of an

engine, always check and remove

these items before starting the

engine.

PERSONAL INJURY

To avoid injury from contact

with rotating parts when an

engine is operating with the air

inlet piping removed, install an

air inlet screen shield over the

turbocharger air inlet. The shield

prevents contact with rotating

parts.

PERSONAL INJURY

To avoid injury when using

caustic cleaning agents, follow

the chemical manufacturers

usage, disposal, and safety

instructions.

FIRE

To avoid injury from combustion

of heated lubricating-oil vapors,

stop the engine immediately if an

oilleakisdetected.

FIRE

To avoid injury from ﬁre, do not

smoke or allow open ﬂames when

workingonanoperatingengine.

FIRE

To avoid injury from ﬁre from a

buildup of volatile vapors, keep

the engine area well ventilated

during operation.

All information subject to change without notice. (Rev. 04/08) 3

CAUTION SUMMARY

Electrical System

Observe the following cautions when

jump starting an engine, charging a

battery, or working with the vehicle

electrical system.

PERSONAL INJURY

To avoid injury from accidental

engine startup while servicing

the engine, disconnect/disable

the starting system.

Electrical Shock

To avoid injury from electrical

shock, use care when connecting

battery cables. The magnetic

switch studs are at battery

voltage.

Battery Explosion and Acid Burn

To avoid injury from battery

explosion or contact with battery

acid, work in a well ventilated

area, wear protective clothing,

and avoid sparks or ﬂames near

the battery. If you come in contact

with battery acid:

□Flush your skin with water.

□Applybakingsodaorlimeto

help neutralize the acid.

□Flush your eyes with water.

□Get medical attention

immediately.

ELECTRICAL SHOCK

To avoid injury from electrical

shock, do not touch battery

terminals, alternator terminals, or

wiring cables while the engine is

operating.

4All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Electrical Shock Hazard

High voltage can remain inside

the Electrostatic Oil Separator

after removal. Wait 30 minutes

after turning off the ignition

before removing the separator.

Never touch parts through

ventilation openings or impeller

opening with ﬁnger or conductive

items (e.g. screwdriver or wire).

High voltage can remain inside

the Electrostatic Oil Separator for

up to 12 hours after the ignition

is turned off.

All information subject to change without notice. (Rev. 04/08) 5

CAUTION SUMMARY

Cooling System

Observe the following cautions when

servicing the cooling system.

HOT COOLANT

To avoid scalding from the

expulsion of hot coolant, never

remove the cooling system

pressure cap while the engine is

at operating temperature. Wear

adequate protective clothing

(face shield, rubber gloves,

apron, and boots). Remove the

cap slowly to relieve pressure.

PERSONAL INJURY

To avoid injury from slipping and

falling, immediately clean up any

spilled liquids.

Air Intake System

Observe the following cautions when

working on the air intake system.

PERSONAL INJURY

To avoid injury from hot surfaces,

wear protective gloves, or allow

engine to cool before removing

any component.

PERSONAL INJURY

To avoid injury from contact

with rotating parts when an

engine is operating with the air

inlet piping removed, install an

air inlet screen shield over the

turbocharger air inlet. The shield

prevents contact with rotating

parts.

6All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Fuel System

Observe the following cautions when

fueling the vehicle or working with

the fuel system.

PERSONAL INJURY

To avoid injury from fuel spills,

do not overﬁll the fuel tank.

FIRE

To avoid injury from ﬁre, contain

and eliminate leaks of ﬂammable

ﬂuids as they occur. Failure to

eliminate leaks could result in

ﬁre.

PERSONAL INJURY

To prevent the escape of high

pressure fuel that can penetrate

skin, ensure the engine has

been shut down for a minimum

of 10 minutes before servicing

any component within the high

pressure circuit. Residual high

fuel pressure may be present

within the circuit.

FIRE

To avoid injury from ﬁre, keep all

potential ignition sources away

from diesel fuel, including open

ﬂames, sparks, and electrical

resistance heating elements. Do

not smoke when refueling.

All information subject to change without notice. (Rev. 04/08) 7

CAUTION SUMMARY

FIRE

To avoid injury from ﬁre caused

by heated diesel-fuel vapors:

□Keep those people who are not

directly involved in servicing

away from the engine.

□Stop the engine immediately if

a fuel leak is detected.

□Do not smoke or allow open

ﬂames when working on an

operating engine.

□Wear adequate protective

clothing (face shield,

insulated gloves and apron,

etc.).

□To prevent a buildup of

potentially volatile vapors,

keeptheengineareawell

ventilated during operation.

8All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Compressed Air

Observe the following cautions when

using compressed air.

EYE INJURY

To avoid injury from ﬂying debris

when using compressed air, wear

adequate eye protection (face

shield or safety goggles) and do

not exceed 276 kPa (40 psi) air

pressure.

Lubricating Oil and Filters

Observe the following cautions when

replacing the engine lubricating oil

and ﬁlters.

PERSONAL INJURY

To avoid injury from slipping and

falling, immediately clean up any

spilled liquids.

FIRE

To avoid injury from combustion

of heated lubricating-oil vapors,

stop the engine immediately if an

oil leak is detected.

FIRE

To avoid injury from ﬁre, do not

smoke or allow open ﬂames when

workingonanoperatingengine.

FIRE

To avoid injury from ﬁre from a

buildup of volatile vapors, keep

the engine area well ventilated

during operation.

All information subject to change without notice. (Rev. 04/08) 9

IDENTIFICATION

The MBE 900 engine is built in

accordance with sound technological

principles and based on state-of-the-art

technology. It complies with all United

States Environmental Protection

Agency (USEPA) and California Air

Resources Board (CARB) emission

standards. An emission label is

attached to the cylinder head cover, as

required by law. See Figure 1 for the

emission label for the 6-cylinder EGR

model and Figure 2 for the 4-cylinder

EGR model.

Figure 1 Emission Label, 6–Cylinder EGR Engine

10 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Figure 2 Emission Label, 4–Cylinder EGR Engine

All information subject to change without notice. (Rev. 04/08) 11

IDENTIFICATION

See Figure 3 for the emission label for

the 6-cylinder non-EGR model. .

Figure 3 Emission Label, Non–EGR 6-Cylinder

12 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

SeeFigure4forthe4-cylinder

non-EGR model

Figure 4 Emission Label, Non–EGR 4-Cylinder

Despite this, the engine may constitute

a risk of damage to property or

injury to persons under the following

conditions:

□It is not used for its intended

purpose.

□It is modiﬁed or converted in an

incorrect manner.

□The safety instructions included in

this manual are disregarded.

Personnel Requirements

Work on the engine should be carried

out only by skilled technicians who

have been instructed in the speciﬁc

skills necessary for the type of work

being performed.

All information subject to change without notice. (Rev. 04/08) 13

IDENTIFICATION

Engine Conversions and

Modiﬁcations

The function and safety of the engine

could be affected if unauthorized

modiﬁcations are made. Detroit

Diesel will not accept responsibility

for any resulting damage.

Tampering with the fuel injection

system and engine electronics could

also affect the engine's power output or

exhaust emission levels. Compliance

with the manufacturer's settings

and with statutory environmental

protection regulations cannot then be

guaranteed.

General View of the MBE

900 Engine

The 2004 on-highway MBE 900

engine is equipped with an Exhaust

Gas Recirculation (EGR) system to

reduce engine exhaust gas emissions

in accordance with EPA regulations.

See Figure 5 for a right front view of

the MBE 900 EGR engine, 6-cylinder

model, and Figure 6 for a left rear

view.

The off-highway engine used

in construction and industrial

applications does not have an EGR

system. See Figure 7 for a front view

of the MBE 900 non-EGR engine,

6-cylinder model, and Figure 8 for

a side view of the 6-cylinder model

(right-hand side).

SeeFigure9forafrontviewofthe

MBE 900 non-EGR engine, 4-cylinder

model, and Figure 9 for a rear view of

the 4-cylinder model.

14 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

1. Turbocharger 7. EGR Mixer

2. Starter Motor 8. Oil Fill Cap

3. Flywheel Housing 9. Oil Filter

4. Exhaust Manifold 10. Turbocharger Compressor Out

5. EGR Cooler 11. Belt Tensioner Assembly

6. Cylinder Head Cover 12. Oil Pan

Figure 5 Right Front View of the MBE 900 EGR Engine

All information subject to change without notice. (Rev. 04/08) 15

IDENTIFICATION

1. Air Compressor 6. Oil Centrifuge

2. DDEC-ECU 7. EGR Mixer

3. Fuel Filter 8. Cylinder Head Cover

4. Thermostat Housing 9. Flywheel Housing

5. Oil Fill Cap 10. Oil Pan

Figure6 LeftRearViewoftheMBE900EGREngine

16 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

1. Fan 10. Cylinder Head Cover

2. Belt Tensioner 11. Fuel Filter

3. Alternator Pulley 12. Fuel Preﬁlter

4. Oil Filter 13. DDEC-ECU

5. Turbo Compressor Out 14. Air Compressor (optional)

6. Intake Manifold Inlet 15. Power-Steering Pump

7. Crankcase Breather 16. Oil Dipstick

8. Oil Fill Cap 17. Coolant Pump Pulley

9. Intake Manifold

Figure 7 Front View of 6–Cylinder MBE 900 Non-EGR Engine

All information subject to change without notice. (Rev. 04/08) 17

IDENTIFICATION

1. Cylinder Head Cover 7. Alternator

2. Intake Manifold 8. Turbocharger

3. Exhaust Manifold 9. Starter Motor

4. Intake Manifold Inlet 10. Flywheel Housing

5. Oil Fill Cap 11. Exhaust Brake (optional)

6. Turbo Compressor Out

Figure 8 Side View of a 6–cylinder MBE 900 Non-EGR Engine

18 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

1. Cylinder Head Cover 9. Belt Tensioner

2. DDEC-ECU Control Unit 10. Alternator Pulley

3. Fuel Preﬁlter 11. Intake Manifold Inlet

4. Air Compressor (optional) 12. Turbo Compressor Out

5. Power-Steering Pump 13. Crankcase Breather

6. Oil Dipstick 14. Oil Fill Cap

7. Fuel Filter 15. Intake Manifold

8. Fan

Figure 9 Front View of 4–Cylinder MBE 900 Non-EGR Engine

All information subject to change without notice. (Rev. 04/08) 19

IDENTIFICATION

1. Oil Fill Cap 7. Starter Motor

2. Turbo Compressor Outlet 8. Exhaust Brake (optional)

3. Intake Manifold Inlet 9. Flywheel Housing

4. Oil Filter 10. Exhaust Manifold

5. Alternator 11. Intake Manifold

6. Turbocharger

Figure 10 Rear View of 4–Cylinder MBE 900 Non-EGR Engine

20 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Engine Identiﬁcation

Number

Theengineidentiﬁcation numbers are

lasered in large font onto an enlarged

labeling surface on the rear right

crankcase. See Figure 11.

Figure 11 Location of Engine

Identiﬁcation Number

See Figure 12 for an example of the

numbers as they appear on the engine.

Figure 12 Engine Identiﬁcation

Number

The last six numbers are the serial

numbers (310187 in Figure 12).

See Figure 13 for an explanation of

the ﬁrst six numbers found in the

engine identiﬁcation number.

Figure 13 Engine Identiﬁcation

All information subject to change without notice. (Rev. 04/08) 21

IDENTIFICATION

NOTE:

In addition to the fourteen digit number

etched on the crankcase, there is a

ten digit number used for warranty

and service that is found on the

DDEC-ECU label. The ten digit

number is derived from the fourteen

digit number (see Figure 14).

Description of the Engine

All MBE 900 engines are

water-cooled, four-stroke,

direct-injection diesel engines.

The cylinders are arranged inline on

both the 6-cylinder and 4-cylinder

models. Each has a separate fuel

injection pump (unit pump) with a

short injection line to the injection

nozzle, which is located in the center

of the combustion chamber. The unit

pumps are attached to the crankcase

and are driven from the camshaft.

Each cylinder has two intake valves

and one exhaust valve.

Charge-air cooling and an exhaust gas

turbocharger are standard equipment

on all MBE 900 engines (charge

pressure limitation is optional).

The engine has a fully electronic

control system, which regulates the

fuel injection quantity and timing

using solenoid valves, allowing

extremely low-emission operation.

The control system consists of an

engine-resident pump and nozzle

control unit (the DDEC-ECU) and a

vehicle control unit (the DDEC-VCU).

The two are connected by a proprietary

datalink.

Engine braking is controlled by a

pneumatic and hydraulic (6-cylinder)

operated exhaust brake on the

turbocharger and by a constant-throttle

system (optional).

Figure 14 Engine Serial Number

22 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

The cylinder block has integrated

oil and water channels. The upper

section of the cylinder bore is

induction-hardened. The single-piece

cylinder head is made of cast

iron. The cylinder head gasket is a

medal-elastomere, adjustment-free

seal with Viton® sealing elements.

The pistons are made of aluminum

alloy with a shallow combustion

chamber recess. The pistons are

cooled by oil spray nozzles.

The crankshaft is precision-forged

with seven main bearings (ﬁve on

the 4-cylinder engine), six of which

have custom-forged counterweights

(four on the 4-cylinder engine), and a

vibration damper at the front end.

The camshaft is made of

case-hardened steel and has seven

main bearings (ﬁve on the 4-cylinder

engine). Each cylinder has cams for

intake and exhaust valves and a unit

pump.

The valves are controlled by

mushroom tappets, pushrods, and

rocker arms. The intake valves are

opened and closed by a valve-guided

bridge.

There is a force-feed lubricating oil

circuit supplied by a rotary oil pump.

This pump is positioned at the front

of the crankcase and driven by gears

from the crankshaft.

The oil cooler is located near the front

of the crankcase on the right-hand side

near the water pump.

The gear-type fuel pump is bolted to

the front of the crankcase. The pump

is driven from the forward end of the

camshaft.

The air compressor, with a

power-steering pump attached,

is driven by a gear on the camshaft

(optional).

The vehicle is cooled by a closed

system using recirculated coolant;

temperature is regulated automatically

by a thermostat.

The alternator and coolant pump (and

any other accessories) are driven by a

belt with automatic belt tensioner.

Electrical equipment includes a starter

and an alternator.

Exhaust Gas Recirculation

The purpose of the Exhaust Gas

Recirculation (EGR) System is to

reduce engine exhaust gas emissions

in accordance with EPA regulations.

The EGR system consists of an EGR

cooler, EGR valve, reed valves (on the

MBE904/924/926 only), and an EGR

mixer.

The MBE 900 engines for on-highway

EPA 2004 regulation applications use

a cooled EGR system.

All information subject to change without notice. (Rev. 04/08) 23

IDENTIFICATION

Exhaust gases from the front three

cylinders on six cylinder engines

(all four cylinders on four cylinder

engines) are routed from the exhaust

manifold through the EGR cooler,

past control and reed valves, and

mixed with the intake manifold charge

air. The addition of cooled exhaust

gases back into the combustion

airﬂow reduces the peak in cylinder

combustion temperature. Less oxides

of nitrogen (NOx) are produced at

lower combustion temperatures.

Exhaust

Brake/Constant-Throttle

Valves, Optional

To increase braking performance,

the engine can be equipped with an

exhaust brake on the turbocharger

in conjunction with constant-throttle

valves in the cylinder head. See Figure

15.

Figure 15 Constant — Throttle

Activation

The two systems operate

independently of each other and

in combination.

Exhaust back pressure is used by the

exhaust brake to increase braking

performance. The constant-throttle

valves use the air that escapes through

them on the compression stroke to

provide braking force.

The constant-throttles valves are

small valves which are built into the

cylinder head and positioned opposite

the exhaust valve. When open, a link

is created between the combustion

chamber and the exhaust port.

When the engine brake is switched

on, the constant-throttle valves are put

under pressure, which in turn opens

the valves.

On the 6-cylinder model, the

constant-throttle valves are activated

by engine oil pressure. On 4-cylinder

engines, the constant-throttle valves

are activated by compressor air

pressure.

The engine brake is activated by the

DDEC-VCU and can be activated

only at engine speeds up to 2700 rpm.

24 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Below 900 rpm, the engine brake

is always turned off to prevent the

engine from stalling. Also, the engine

brake is automatically turned off when

the accelerator pedal is pressed.

NOTE:

When in emergency running mode

(constant rpm), the engine brake can

be activated only when the engine is

in overrun. When constant rpm has

been attained, the engine brake is

automatically turned off.

Electronic Engine Control

System

The engine is equipped with a fully

electronic control system. Besides the

engine and its related sensors, this

system is composed of the following:

□The DDEC-ECU (engine control

unit)

□The DDEC-VCU (vehicle control

unit) located under the right-hand

dash panel

The two control units are connected by

a proprietary datalink through which

all necessary data and information can

be exchanged. See Figure 16.

The DDEC-VCU then broadcasts all

information on the J1587 and J1939

datalinks, where it can be read by

the Nexiq™ Diagnostic Data Reader

(DDR), Detroit Diesel Diagnostic

Link® (DDDL) PC-based software or

minidiag2.

The engine control system monitors

both the engine and the datalink.

When a malfunction or other problem

is detected, the system selects an

appropriate response; for example,

the emergency running mode may be

activated.

All information subject to change without notice. (Rev. 04/08) 25

IDENTIFICATION

Figure 16 Electronic Engine Control System

DDEC-ECU

TheDDEC-ECU(seeFigure17)is

located on the left-hand side of the

engine.

The DDEC-ECU processes the data

received from the DDEC-VCU, for

example the position of the accelerator

pedal, engine brake, etc.

Figure 17 DDEC-ECU

26 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

These data are evaluated together

with the data from the sensors on

the engine, such as coolant and

fuel temperature and oil and charge

pressure.

Thedataisthencomparedtothe

characteristic maps or lines stored in

the DDEC-ECU. From these data,

quantity and timing of injection are

calculated and the unit pumps are

actuated accordingly through the

solenoid valves.

NOTE:

To obtain a replacement DDEC-ECU,

all the data given on the DDEC-ECU

label are required.

The DDEC-ECU data label has the 10

digit engine serial number (see Figure

14), the engine horse power and

torque.

DDEC-VCU

The DDEC-VCU communicates

with any other electronic control unit

installed on the vehicle over the J1587

data link. See Figure 18.

Data for speciﬁc applications is stored

in the DDEC-VCU. These include idle

speed, maximum running speed, and

speed limitation.

Figure 18 DDEC-VCU

The DDEC-VCU receives data from

the following sources:

□The operator (accelerator pedal

position, engine brake switch)

□Other electronic control units

(for example, the anti-lock brake

system)

□The DDEC—ECU (oil pressure

and coolant temperature)

From these data, instructions are

computed for controlling the engine

andtransmittedtotheDDEC-ECUvia

the proprietary datalink.

The DDEC-VCU controls

various systems, for example,

communications with the datalink, the

engine brake, and the constant-throttle

valves.

All information subject to change without notice. (Rev. 04/08) 27

IDENTIFICATION

Sensor Locations

See Figure 19 and Figure 20 for

sensor locations on the MBE 900

EGR engine. See Figure 21 for sensor

locations on the MBE 900 non-EGR

engine.

CHEMICAL BURNS

To avoid injury from chemical

burns, wear a face shield and

neoprene or PVC gloves when

handling sensor hoses.

1. Intake Manifold Pressure/Temper-

ature Sensor 3. Engine Oil Pressure Sensor

2. Engine Oil Temperature Sensor

Figure 19 Sensor Location on the Right Side of the MBE 900 EGR Engine

28 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

1. EGR Temperature Sensor 4. Barometric Pressure Sensor

(integrated into DDEC-ECU)

2. Engine Coolant Temperature

Sensor 5. Camshaft Position Sensor (on

camshaft)

3. Supply Fuel Temperature Sensor 6. Crankshaft Position Sensor (on

timing case)

Figure 20 Sensor Location on the Left Side of the MBE 900 EGR Engine

NOTE:

The 6-cylinder engine is shown;

sensor locations are similar on the

4-cylinder engine.

NOTE:

The Barometric Pressure Sensor is

integrated into the DDEC-ECU.

All information subject to change without notice. (Rev. 04/08) 29

IDENTIFICATION

1. Engine Oil Pressure/Temperature

Sensor 5. Barometric Pressure Sensor

(integrated into DDEC-ECU)

2. Engine Coolant Temperature

Sensor 6. Camshaft Position Sensor (on

camshaft)

3. Intake Manifold Pressure/Temper-

ature Sensor 7. Crankshaft Position Sensor (on

timing case)

4. Supply Fuel Temperature Sensor

Figure 21 Sensor Location on the MBE 900 Non-EGR Engine

NOTE:

The 6-cylinder engine is shown;

sensor locations are similar on the

4-cylinder engine.

NOTE:

The Engine Oil Level Sensor, if used,

is located at the bottom of the oil pan.

30 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

OPERATION

Important: Before starting the engine,

do all the recommended pretrip

inspections and daily maintenance.

Check the engine oil and fuel levels,

and drain contaminants from the

fuel/water separator (optional).

Before Starting the Engine

NOTE:

If you drain the fuel/water separator

completely, you may have to prime the

fuel system.

Be sure you are familiar with all of

the instruments, gauges and controls

which are needed to operate the

engine.

Note especially the location and

function of the following:

□Oil Pressure Gauge

□Coolant Temperature Gauge

□Low Oil Pressure/High Coolant

Temperature Warning Light

□Water In Fuel Warning Light

□Tachometer

□Air Restriction Indicator

When starting the engine, and while

driving, watch for any signs of engine

problems. If the engine overheats,

uses excessive fuel or lubricating

oil, vibrates, misﬁres, makes unusual

noises, or shows an unusual loss of

power, turn the engine off as soon

as possible and determine the cause.

Frequently, engine damage may be

avoided by a quick response to early

indications of problems.

If you are starting the engine in cold

weather, refer to "Cold Weather

Products" in the “Service Products”

section of this manual.

Checking the Batteries

Use only batteries that have been

correctly ﬁlled and serviced. To

provide corrosion protection, apply

dielectric grease, part number

48-02349-000, liberally to the

terminal pads. Approved suppliers are

listed in Table 1.

Manufacturer Lubricant or

Part Number

Shell Oil, Co. No. 71032; No.

71306

Texaco, Inc. No. 955

Quaker State No. NYK-77

Table 1 Approved Electrical

Lubricants

All information subject to change without notice. (Rev. 04/08) 31

OPERATION

Battery Explosion and Acid Burn

To avoid injury from battery

explosion or contact with battery

acid, work in a well ventilated

area, wear protective clothing,

and avoid sparks or ﬂames near

the battery. If you come in contact

with battery acid:

□Flush your skin with water.

□Apply baking soda or lime to

help neutralize the acid.

□Flush your eyes with water.

□Get medical attention

immediately.

Checking the Oil Level

Check the oil level as follows:

1. Check the oil level using the oil

dipstick (see Figure 22).

PERSONAL INJURY

To avoid injury from slipping and

falling, immediately clean up any

spilled liquids.

Figure 22 Oil Dipstick

2. If necessary, top off by ﬁlling

engine oil through the oil ﬁll

collar (see Figure 23) until the

maximum ﬁll level on the oil

dipstick (see Figure 22) has been

reached. For detailed procedures,

refer to the ”Maintenance”

section. Do not overﬁll.

Figure 23 Oil Fill Collar

32 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Checking the Coolant Level

(Cold Check)

Check the coolant level as follows:

1. Ensure that all coolant plugs in

the bottom of the radiator and on

the radiator outlet pipe are secure

and tight.

2. Check the coolant level. The

cooling system is correctly ﬁlled

when the coolant is between the

maximum and minimum marks

on the surge tank.

NOTE:

For more information, refer to the

”Maintenance” section.

Adding Fuel

Note the following when adding fuel:

□Addwinterorsummergradefuel

according to the season of the

year.

□Work in the cleanest conditions

possible.

□Prevent water from entering the

fuel tank. For further information

refer to “Diesel Fuels” in “Service

Products.”

Priming the Fuel System

Prime the fuel system as follows:

NOTICE:

Correct torque on the high pressure

lines is critical. Incorrect torques

could result in leaks or lack of power

due to restricted fuel ﬂow.

1. Make sure that all high-pressure

and low-pressure lines are

securely tightened.

2. If equipped with a hand pump on

the fuel/water separator, work the

hand pump 50 times.

3. Crank the engine for 30 seconds

at a time, but no longer. Before

cranking the engine again, wait

at least two minutes. The engine

should start within six 30-second

attempts.

Starting the Engine

Before operating the engine, follow

the steps described in the “Before

Starting the Engine” section. Start the

engine as follows:

NOTE:

As a safety function, the electronic

engine control system may be wired to

start the engine only if the transmission

is in neutral. This is vehicle application

speciﬁc.

All information subject to change without notice. (Rev. 04/08) 33

OPERATION

NOTICE:

Never attempt to start the

Mercedes-Benz MBE 900 engine

using ether or any other starting

ﬂuid. Serious engine damage could

result.

1. Turn on the ignition switch.

2. With the accelerator pedal in the

idle position, start the engine.

PERSONAL INJURY

To avoid injury when working

near or on an operating engine,

remove loose items of clothing

and jewelry. Tie back or contain

long hair that could be caught in

any moving part causing injury.

3. Check the engine for leaks.

[a] Check all hoses, hose clamps,

and pipe unions on the engine

for tightness. Shut down the

engine and tighten them if

necessary.

[b] Check the oil feed and return

lines at the turbocharger for

tightness. Shut down the

engine and tighten them if

necessary.

4. Shut down the engine.

5. Approximately ﬁve minutes after

shutdown, check the engine oil

level. If necessary, add oil up to

the maximum ﬁll level on the oil

dipstick (see Figure 24). Do not

overﬁll.

Figure 24 Oil Dipstick

6. Check all the mounting fasteners

and belts on the engine for

tightness.

Checking the Coolant Level (Hot

Check)

Check coolant level as follows:

1. Allow the engine to run for

approximately ﬁve minutes at a

moderate speed.

34 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

HOT COOLANT

To avoid scalding from the

expulsion of hot coolant, never

remove the cooling system

pressure cap while the engine is

at operating temperature. Wear

adequate protective clothing

(face shield, rubber gloves,

apron, and boots). Remove the

cap slowly to relieve pressure.

2. Then, with the coolant

temperature above 50°C (122°F),

recheck the coolant level.

3. Add more coolant if necessary.

Open the heater valves before

adding coolant.

4. Do not close the heater valves

until the engine has been run

brieﬂy and the coolant level

again checked and corrected as

necessary.

Starting an Engine That Has

Not Been Run for an Extended

Period

Before starting an engine which has

not been run for an extended period,

certain special work must be carried

out. Refer to “Storage,” under

“Cleaning and Storage.”

Important: At outside temperatures

below –20°C (– 4°F), a coolant

preheater is recommended.

1. Chock the tires, place the

transmission in neutral, and set

the parking brake.

2. Turn on the ignition switch and

start the engine

3. If the engine doesn't start after

20 seconds, stop. Try again after

waiting about one minute.

NOTICE:

Do not rev the engine if the oil

pressure gauge indicates no

oil pressure. To avoid engine

damage, shut down the engine

if no oil pressure appears within

approximately ten seconds. Check

to determine the cause of the

problem.

4. Monitor the oil pressure gauge

immediately after starting the

engine.

NOTE:

Do not place the engine under full load

until it reaches operating temperature.

All information subject to change without notice. (Rev. 04/08) 35

OPERATION

Monitoring Engine

Operation

While the engine is operating, monitor

the battery charge indicator light,

the oil pressure and avoid excessive

idling.

Battery Charge

The battery charge indicator light

(see Figure 25) must go out once the

engine starts.

Figure 25 Battery Charge Indicator

Light

If the indicator light comes on

while the engine is running, do the

following:

FIRE

To avoid injury from ﬁre, keep all

potential ignition sources away

from diesel fuel, including open

ﬂames, sparks, and electrical

resistance heating elements. Do

not smoke when refueling.

1. Shut down the engine.

2. Check the poly-V belt for

tightness.

3. Do a load test on the batteries.

Charge or replace the batteries as

needed.

4. If necessary, visit the nearest

authorized dealer to have the

alternator voltage and output

checked.

Oil Pressure

When the engine has reached its

normal operating temperature, the

engine oil pressure must not drop

below the following values:

□36 psi (250 kPa) at rated speed

□7psi(50kPa)atidlingspeed

If oil pressure drops below these

values, stop the engine and determine

the cause.

36 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Excessive Idling

Never allow the engine to idle for

more than 30 minutes. Excessive

idling can cause oil to leak from the

turbocharger.

Changing the Idle Speed

The rpm range of the MBE 900

engine is 600 rpm to 850 rpm if the

parameters in the DDEC-VCU are set

to the default range.

Change the idling speed as follows:

1. Turn the cruise control switch to

the OFF position.

2. To increase the idle speed, push

the "Resume" switch until the idle

is fast enough.

3. To decrease the idle speed, push

the "Decel" switch until the idle

is slow enough.

Shutting Down the Engine

If the engine has been running at full

output or the coolant temperature has

been high, allow the engine to idle

for one to two minutes without load.

Then turn off the ignition key switch.

If any the following occur, shut down

the engine immediately.

□The oil pressure swings back and

forth or falls sharply.

□Engine power and rpm fall, even

though the accelerator pedal

remains steady.

□The exhaust pipe gives off heavy

smoke.

□The coolant and/or oil temperature

climb abnormally.

□Abnormal sounds suddenly occur

in the engine or turbocharger.

Shutting Down After Hard

Operation

NOTICE:

After hard operation, if the engine

has been running at full output or the

coolant temperature has been high,

allow the engine to idle for one to

two minutes without load. Shutting

down the engine without idling may

cause damage to the turbocharger.

Turn off the ignition switch and shut

down the engine.

All information subject to change without notice. (Rev. 04/08) 37

OPERATION

Emergency Running Mode

The engine is equipped with the

electronic engine control system,

which monitors the engine as it is

running.

As soon as a fault is detected, it is

evaluated and one of the following

measures is initiated.

NOTICE:

To prevent possible serious engine

damage, have any faults corrected

without delay by an authorized

dealer.

□In conjunction with the

instrumentation control unit

(ICU),thecodefortheelectronic

control unit reporting the fault

can be read immediately on the

display.

□Complete fault codes are

transmitted and can be read using

ServiceLink at any authorized

dealer.

□If the fault is serious enough to

impair normal operation, the

electronic engine system switches

over to emergency running mode.

When in emergency running

mode, the engine operates at a

constant 1300 rpm. This allows

you to move the vehicle to a

service location.

Stop Engine Override

Option

TheStopEngineOverrideOptionis

used for a momentary override. The

DDEC-ECU will record the number

of times the override is activated after

a fault occurs.

Momentary Override –AStop

Engine Override (SEO) switch

is used to override the shutdown

sequence (see Figure 26). This

override resets the 60 second (30

seconds for oil pressure) shutdown

timer, restoring power to the level

when the Red Stop Lamp (RSL) was

illuminated. The switch must be

recycled after ﬁve seconds to obtain a

subsequent override.

Figure 26 Typical SEO Switch and

Warning Lamps

NOTE:

The operator has the responsibility to

take action to avoid engine damage.

38 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Cold Weather Operation

Special precautions must be taken

during cold weather. To protect

your engine, special cold weather

handling is required for fuel, engine

oil, coolant, and batteries. For detailed

information, refer to the service

manual.

Winter Fronts

Awinterfrontmaybeusedtoimprove

cab heating while idling. At least 25%

of the grill opening should remain

open in sectioned stripes that run

perpendicular to the charge air cooler

tube ﬂow direction. This assures even

cooling across each tube and reduces

header to tube stress and possible

failure. Winter fronts should only be

used when the ambient temperature

remains below –12.2° C (10° F).

All information subject to change without notice. (Rev. 04/08) 39

CLEANING AND STORAGE

When an engine is to be stored for a

period of time, special precautions

should be taken to protect the interior

and exterior of the engine.

Cleaning the Engine

Important: Observe all environmental

protection regulations.

High-Pressure Cleaning

Equipment

Note the equipment manufacturer's

operating instructions.

NOTICE:

To prevent damage to engine

components during the cleaning

process, keep the water moving

at all times. Never direct water

onto electrical components, plug

connectors, seals or ﬂexible hoses.

Comply with the minimum working

distance between the high-pressure

nozzle and the surface being cleaned:

□Approximately 700 mm (28 in.)

for circular pattern jets

□Approximately 300 mm (12 in.)

for 25-degree ﬂat jets and dirt

cutters

After cleaning, and especially

when using a high-pressure jet or

grease-removing agent, lubricate

the engine. Information on suitable

cleaning and protective products is

available from any authorized dealer.

Cleaning the Cooling

System

Important: Collect the used coolant,

cleaning solutions, and washing

liquids. Dispose of them in accordance

with applicable laws regarding the

protection of the environment.

NOTICE:

Clean at moderate pressures only;

otherwise the ﬁns of the radiator

grille could be damaged.

40 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Clean as follows:

EYE INJURY

To avoid injury from ﬂying debris

when using compressed air, wear

adequate eye protection (face

shield or safety goggles) and do

not exceed 276 kPa (40 psi) air

pressure.

1. Remove debris (dust, insects,

etc.) from the ﬁns of the radiator

grille by blowing them through

with compressed air or spraying

them out with water. Work from

the rear of the radiator (in the

opposite direction of the normal

cooling air ﬂow).

2. Drain the coolant when

the engine is cold. For

detailed procedures, see the

vehicle/chassis maintenance

manual. For types of coolant,

refer to “Coolant” in the “Service

Products” section.

3. If the HVAC unit is connected

to the cooling system, open the

regulating valves all the way.

Degreasing

Degrease as follows:

1. Fill the cooling system with a 5%

solution (1.6 ounces per quart of

water—50 grams per liter) of a

mildly alkaline cleaning agent,

such as sodium carbonate.

2. Run the engine at moderate speed

until the thermostat starts to open,

at an operating temperature of

approximately 80°C (176°F).

Then run it for about ﬁve minutes

longer. Shut down the engine and

allowittocooltoapproximately

50°C (112°F).

HOT COOLANT

To avoid scalding from the

expulsion of hot coolant, never

remove the cooling system

pressure cap while the engine is

at operating temperature. Wear

adequate protective clothing

(face shield, rubber gloves,

apron, and boots). Remove the

cap slowly to relieve pressure.

3. Drain all the cleaning solution.

4. Flush the cleaning solution from

the cooling system.

[a] Immediately after draining

the cleaning solution, ﬂush

the system with clean water.

[b] Once the clean water has

drained, ﬁll the system again

with clean water.

All information subject to change without notice. (Rev. 04/08) 41

CLEANING AND STORAGE

[c] Run the engine. Allow

the engine to warm up to

approximately 80°C (176°F),

and then run it about ﬁve

minutes longer.

[d] Drain the hot water.

5. Fill the cooling system with new

coolant. For detailed procedures,

see the vehicle/chassis

maintenance manual. For types

of coolant, refer to “Coolant” in

the “Service Products” section.

Storage

Required protective measures for

the MBE 900 engine depend on the

following:

□The length of time that the engine

will be out of service

□The climate and conditions where

the engine is stored

After cleaning, engines should,

whenever possible, be placed in a dry,

well-ventilated area.

In all cases, protect the engine

against direct exposure to moisture

(rain/splash water).

If the engine is to be out of service

for 12 months or less, anticorrosion

measures are not necessary, provided

that the place of storage are dry and

well-ventilated as described above.

If the engine is to be out of service

forover12months,orunder

extraordinary storage or transportation

conditions, then special protective

measures are necessary. Information

is available from any authorized

dealer. It is strongly recommended

that you request this information.

Important: If the engine is to be out

of service for over 18 months, the oil

must be changed before the engine

can be brought back into service.

42 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

TROUBLESHOOTING

In addition to operating the engine

carefully and maintaining it properly,

make sure to correct any malfunction

promptly.

Emergency Starting

For emergency starting procedures

(jump starting), see the

driver's/operator's manual under

the heading "Emergency Starting With

Jumper Cables."

Troubleshooting the

Electronic Engine Control

System

Whentheelectronicenginecontrol

system detects a fault, it broadcasts

a message on the datalink. The dash

display will show the code "ECU

128," indicating there is an engine

fault.

Important: To read the complete

fault code, bring the vehicle to an

authorized dealer. Complete fault

codes can be read using ServiceLink.

For fault codes and their meanings,

see the service/workshop manual.

General Troubleshooting

The tables that follow are designed

to identify the causes of common

problems, suggest further checks and

appropriate remedies. When dealer

service is necessary, it is mentioned

in the table.

NOTE:

Remember to follow all cautions when

troubleshooting the engine.

All information subject to change without notice. (Rev. 04/08) 43

TROUBLESHOOTING

Problem - The Engine Will Not Crank

Cause Remedy

The batteries are damaged or weak. Test the batteries. Replace them, if

needed.

The ignition switch is damaged. Replace the ignition switch.

The battery cables are damaged

and/or corroded. Replace the battery cables.

The starter is damaged and/or worn. Have an authorized dealer replace the

starter.

Theclutchortransmissionis

damaged. Bringthevehicletoanauthorized

dealer for service.

There is internal damage to the

engine. Bringthevehicletoanauthorized

dealer for service.

Problem—The Engine Turns Over Slowly

Cause Remedy

The batteries are damaged or weak. Test the batteries. Replace them, if

needed.

The ignition switch is damaged. Replace the ignition switch.

The battery cables are damaged

and/or corroded Replace the battery cables.

The starter is damaged and/or worn. Have an authorized dealer replace the

starter.

The engine oil does not meet the

correct speciﬁcations. Change the engine oil, using the

correct type of oil.

The transmission ﬂuid does not meet

the correct speciﬁcations. Change the transmission ﬂuid, using

the correct type of ﬂuid.

44 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Problem—The Engine Cranks, But Won't Start

Cause Remedy

The batteries are damaged or weak. Test the batteries. Replace them, if

needed.

The cranking speed is not set correctly. Bringthevehicletoanauthorized

dealer for service.

No intake air preheater is installed,

and it is too cold to start without one. Install an intake air preheater.

The intake air preheater is

malfunctioning. Check the intake air preheater, and

replace it, if necessary.

The camshaft TDC sensor and/or the

crank angle position sensor are out of

adjustment.

Push both sensors into their holes as

far as they will go. If this does not

solve the problem, bring the vehicle to

an authorized dealer for service.

The camshaft TDC sensor and/or

the crank angle position sensor are

damaged.

Bringthevehicletoanauthorized

dealer for service.

There is air in the fuel system.

Check the fuel lines for leaks. Bleed

the fuel system and start the engine

according to the instructions in the

service manual.

The air ﬁlter is clogged. Clean or replace the air ﬁlter.

The fuel ﬁlter is clogged. Replace the ﬁlter element.

The exhaust brake valve is

malfunctioning. Have an authorized dealer check the

operation of the valve.

The valves are not adjusted properly. Check the valve lash.

There are other problems in the fuel

system. Bringthevehicletoanauthorized

dealer for service.

Coolant level is too low. Check for leaks, add coolant to correct

level.

All information subject to change without notice. (Rev. 04/08) 45

TROUBLESHOOTING

Problem—The Engine Starts Only After Cranking for a Long Time

Cause Remedy

The fuel tank is low or empty. Add fuel and bleed the fuel system, if

necessary.

There are leaks in the fuel lines. Check the fuel lines for leaks and

repair them, if necessary.

The fuel ﬁlter is clogged. Replace the ﬁlter element.

The fuel line, the fuel preﬁlter, or the

screen in the fuel tank is blocked.

Clean and bleed the system. Have

the fuel lines and ﬁlters checked by an

authorized dealer.

The camshaft TDC sensor and/or the

crank angle position sensor are out of

adjustment.

Push both sensors into their holes as

far as they will go. If this does not

solve the problem, bring the vehicle to

an authorized dealer for service.

The camshaft TDC sensor and/or

the crank angle position sensor are

damaged.

Bringthevehicletoanauthorized

dealer for service.

There are other problems in the fuel

system. Bringthevehicletoanauthorized

dealer for service.

46 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Problem—The Engine Starts, But Dies

Cause Remedy

The fuel tank is low or empty. Add fuel and bleed the fuel system, if

necessary.

The fuel ﬁlter is clogged. Replace the ﬁlter element.

The fuel line, the fuel preﬁlter, or the

screen in the fuel tank is blocked.

Clean and bleed the system. Have

the fuel lines and ﬁlters checked by an

authorized dealer.

The camshaft TDC sensor and/or the

crank angle position sensor are out of

adjustment.

Push both sensors into their holes as

far as they will go. If this does not

solve the problem, bring the vehicle to

an authorized dealer for service.

The camshaft TDC sensor and/or

the crank angle position sensor are

damaged.

Bringthevehicletoanauthorized

dealer for service.

The constant-throttle valves are

malfunctioning. Bringthevehicletoanauthorized

dealer for service.

There are other problems in the fuel

system.

Bringthevehicletoanauthorized

dealer for service.

Problem—The Engine Fan Doesn't Work

Cause Remedy

The fan hub is damaged. Replace the fan hub.

The fan wiring is damaged. Repair the fan wiring.

The parameter settings in the

DDEC-ECU or DDEC-VCU are

incorrect.

Have an authorized dealer reprogram

the control unit.

All information subject to change without notice. (Rev. 04/08) 47

TROUBLESHOOTING

Problem—The Engine Fan Is Constantly On

Cause Remedy

The fan override switch is on. Check the operation of the fan override

switch.

The fan hub is damaged. Replace the fan hub

The parameter settings in the

DDEC-ECU or DDEC-VCU are

incorrect.

Have an authorized dealer reprogram

the control unit.

Problem—Fuel Consumption Is Too High

Cause Remedy

The tires are not properly inﬂated. Check all tires for correct pressure.

The air ﬁlter and/or intake air system

is clogged.

Check the air restriction indicator.

Clean the intake air system and

replace the air ﬁlter if necessary.

The fuel ﬁlter is clogged. Replace the ﬁlter element.

The exhaust brake valve is

malfunctioning. Have an authorized dealer check the

operation of the valve.

The engine performs poorly, or does

not develop full power.

The remedies are listed in -48"The

Engine Performs Poorly, Does Not

Develop Full Power” in this section.

48 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Problem—The Engine Performs Poorly, Does Not

Develop Full Power

Cause Remedy

The air ﬁlter and/or intake air system

is clogged.

Check the air restriction indicator.

Clean the intake air system and

replace the air ﬁlter if necessary.

The exhaust brake valve is

malfunctioning. Have an authorized dealer check the

operation of the valve.

The fuel ﬁlter is clogged. Replace the ﬁlter element.

There are other problems with the fuel

system.

Bringthevehicletoanauthorized

dealer for service.

The valves are not adjusted properly Check the valve lash.

The coolant temperature sensor is

damaged or reading incorrectly. Bringthevehicletoanauthorized

dealer for service.

The fuel temperature sensor is

damaged or reading incorrectly. Bringthevehicletoanauthorized

dealer for service.

Theengineoiltemperaturesensoris

damaged or reading incorrectly. Bringthevehicletoanauthorized

dealer for service.

The charge-air temperature sensor is

damaged or reading incorrectly. Bringthevehicletoanauthorized

dealer for service.

There are problems with the

DDEC-ECU or DDEC-VCU. Bringthevehicletoanauthorized

dealer for service.

There is internal damage to the

engine. Bringthevehicletoanauthorized

dealer for service.

All information subject to change without notice. (Rev. 04/08) 49

TROUBLESHOOTING

Problem—The Engine Is in Emergency Running Mode

(constant speed 1,300 rpm)

Cause Remedy

The DDEC-ECU or DDEC-VCU

or sensor(s), solenoids and other

electronic parts are damaged.

Bringthevehicletoanauthorized

dealer for service.

Problem—The Coolant Temperature Is Above Normal

Cause Remedy

The coolant level is too low. Check for coolant leaks, and repair as

needed.

The poly-V belt is loose. Tighten or replace the poly-V belt.

The coolant temperature gauge and/or

sensor is not reading correctly.

Bringthevehicletoanauthorized

dealer for service.

The radiator is damaged or dirty. Clean the radiator. Repair or replace

the radiator if necessary.

The coolant pump is damaged. Have an authorized dealer replace the

coolant pump.

The thermostat is damaged. Have an authorized dealer replace the

coolant pump.

The fan is not operating properly.

Bringthevehicletoanauthorized

dealer and have the fan hub checked.

Bringthevehicletoanauthorized

dealer and have the parameter

settings reprogrammed in the

DDEC-ECU or DDEC-VCU.

50 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Problem—The Coolant Temperature Is Below Normal

Cause Remedy

The coolant temperature gauge and/or

sensor is not reading correctly.

Bringthevehicletoanauthorized

dealer for service.

The thermostat is damaged. Have an authorized dealer replace the

thermostat.

The fan is not operating properly.

Bringthevehicletoanauthorized

dealer and have the fan hub checked.

Bringthevehicletoanauthorized

dealer and have the parameter

settings reprogrammed in the

DDEC-ECU or DDEC-VCU.

Problem—The Cooling System Is Losing Coolant

Cause Remedy

There is an external coolant leak. Repair the leaking component.

The radiator cap is leaking. Replace the radiator cap.

The air compressor head is damaged. Have an authorized dealer replace the

air compressor.

The cylinder head gasket is leaking. Have an authorized dealer replace the

head gasket.

Top tank is leaking. Bringthevehicletoanauthorized

dealer.

EGR system has an internal leak. Bringthevehicletoanauthorized

dealer.

All information subject to change without notice. (Rev. 04/08) 51

TROUBLESHOOTING

Problem—There Is Coolant in the Engine Oil

Cause Remedy

The cylinder head gasket is damaged. Have an authorized dealer replace the

head gasket.

The oil/water heat exchanger is

leaking.

Have an authorized dealer replace the

heat exchanger.

There is an internal coolant leak. Bringthevehicletoanauthorized

dealer for service.

Problem—There Is Foam in the Engine Oil

Cause Remedy

The oil level is too low or too high. Correct the oil level.

The oil has not been changed within

the recommended interval. Change the oil.

The oil is not of the recommended

quality. Change the oil.

Problem—The Engine Oil Pressure Is Low

Cause Remedy

The oil pressure gauge and/or sensor

is not reading correctly. Bringthevehicletoanauthorized

dealer for service.

There is fuel in the oil. Bringthevehicletoanauthorized

dealer for service.

The oil ﬁlter is clogged. Replace the ﬁlter element.

The oil ﬁlter bypass valve is damaged. Replace the bypass valve.

The oil pump and/or relief valve is

damaged. Have an authorized dealer replace the

oil pump.

52 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Problem—The Engine Exhaust Is White

Cause Remedy

The fuel is of poor quality. Add fuel of the right quality.

The intake air preheater is

malfunctioning. Check the intake air preheater, and

replace it, if necessary.

The valves are not adjusted properly. Check the valve lash.

Problem—The Engine Exhaust Is Black

Cause Remedy

The air ﬁlter and/or intake air system

is clogged.

Check the air restriction indicator.

Clean the intake air system and

replace the air ﬁlter if necessary.

The exhaust brake valve is

malfunctioning. Have an authorized dealer check the

operation of the valve.

The intake air preheater is

malfunctioning. Check that the heater is not staying on

all of the time.

The valves are not adjusted properly. Check the valve lash.

There is damage to the fuel system:

the fuel pump, one or more fuel

injectors, or one or more unit pumps

are damaged.

Bringthevehicletoanauthorized

dealer for service.

The charge-air temperature sensor is

damaged. Bringthevehicletoanauthorized

dealer for service.

There is internal damage to the

engine. Bringthevehicletoanauthorized

dealer for service.

All information subject to change without notice. (Rev. 04/08) 53

TROUBLESHOOTING

Problem—The Engine Exhaust Is Blue

Cause Remedy

The engine oil level is too high

(engine oil is reaching the combustion

chamber).

Adjusttheoillevel,andthenhavethe

oil level checked by an authorized

dealer.

The turbocharger is leaking oil. Have an authorized dealer replace the

turbocharger

The valve stem seals are loose or

damaged. Have an authorized dealer replace the

seals.

Thepistonringsareworn. Have an authorized dealer replace the

piston rings.

Problem—Engine Brake Performance Is Poor

Cause Remedy

Theenginebrakecontrolswitchis

damaged. Replace the switch

The exhaust brake is not operating

properly. Have an authorized dealer check the

operation of the valve.

The constant-throttle valves are

malfunctioning. Bringthevehicletoanauthorized

dealer for service.

Components of the DDEC-ECU and/or

DDEC-VCU are damaged. Bringthevehicletoanauthorized

dealer for service.

Problem—Cruise Control Is Not Working

Cause Remedy

One or more of the cruise control

switches are damaged. Replace the damaged switch.

Components of the DDEC-ECU and/or

DDEC-VCU are damaged or not

working properly.

Bringthevehicletoanauthorized

dealer for service.

54 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Problem—The Battery Charge Indicator Light Does Not

Come On When the Engine Is Not Running

Cause Remedy

The bulb is damaged. Change the bulb.

The circuit is broken. Repair the break in the circuit.

Problem—The Battery Charge Indicator Light Comes

On When the Engine is Running

Cause Remedy

The poly-V belt is too loose. Check the belt tension; if necessary,

have an authorized dealer replace the

belt tensioner.

The belt tensioner is damaged. Have an authorized dealer replace the

belt tensioner.

The poly-V belt is worn or damaged. Replace the belt.

The alternator is damaged (has a

damaged rectiﬁer or voltage regulator).

Have an authorized dealer replace the

alternator.

All information subject to change without notice. (Rev. 04/08) 55

SERVICE PRODUCTS

Use only the DDC recommended

lubricants discussed in this section.

Additional information is available

from any authorized dealer.

Do not use special lubricant additives.

None are needed, and the use of

additives could affect warranty

coverage.

Important: Dispose of service

products in an environmentally

responsible manner. This includes any

parts which have been in contact with

them (for example, ﬁlters). Reclaim

them or recycle them, if possible,

and be sure to comply with all legal

disposal requirements.

Diesel Fuels

Use only commercially available

vehicle diesel fuel. Grades such as

marine diesel fuel, heating oil, and

others are not permissible.

Do not use fuel additives. Using fuel

additives could affect your warranty.

Only low sulfur diesel fuel should

be used for EGR engines (sulfur

content = 0.05 percent by weight).

For non-EGR engines if you are

using diesel fuel with a high sulphur

content, exceeding 0.5 percent by

weight, change the engine oil at

shorter intervals. Comply with the

instructions in the service manual.

Fuel added from drums or cans could

be contaminated. This could lead

to malfunctions in the fuel system.

Always ﬁlter the fuel before adding it

to the tank. Ensure there is no water

in the fuel.

For information about fuel in cold

weather operation, refer to the section

“Winter-Grade Diesel Fuel" later in

this chapter.

Flow Improvers

The effectiveness of ﬂow improvers is

not guaranteed with all fuels. Comply

with the product manufacturer's

recommendations. Any authorized

dealer can provide information on

approved ﬂow improvers.

Kerosene

Keep the quantity added as low as

possible, bearing in mind the outside

temperature.

The addition of ﬁve percent by

volume of kerosene will improve

the fuel's resistance to cold by about

1°C (1.8°F). Never add more than 50

percent kerosene to the fuel.

56 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

NOTICE:

For safety reasons, add the

kerosene to the diesel only in the

fuel tank. Add the kerosene ﬁrst,

then the diesel. Run the engine for

a short time to allow the mixture to

reach all parts of the fuel system.

Engine Oils

The engine is delivered from the

factory ﬁlled with an approved engine

oil.

NOTICE:

The use of non-approved engine

oils could affect warranty rights, and

cause engine damage.

To ensure long and trouble-free

service, it is important to select oil

of the correct viscosity and service

designation.

EGR Engines

Only multigrade oils of American

Petroleum Institute (API) service

designation CI-4 will achieve proper

performance for the cooled EGR

engines. Detroit Diesel POWER

GUARD oils meet this speciﬁcation

and are recommended. Look for

the service mark printed on the oil

container. See Figure 27.

Figure 27 API Lubricant Service

Mark

When maintenance work is performed,

record engine oil changes including

details of the brand used, the

quality category, and the Society

of Automotive Engineers (SAE)

viscosity rating of the oil. When

topping off, use only engine oils

of the correct API designation

and SAE rating. Detroit Diesel

POWER GUARD oils meet these

speciﬁcations.

For information about oil in cold

weather operation, see the heading

"Low-Viscosity Engine Oil" later in

this chapter.

All information subject to change without notice. (Rev. 04/08) 57

SERVICE PRODUCTS

Non-EGR Engines

API CI-4 or CH-4 oils are

recommended for use in all non-EGR

engines. These oils are intended for

engines with open breather systems.

Detroit Diesel POWER GUARD

oils meet these speciﬁcations and are

recommended.

Synthetic Oils

SyntheticoilmaybeusedinMBE

900 engines, provided they are of the

correct API designation and viscosity,

as required for non-synthetic oil.

Synthetic oil offers improved

low-temperature ﬂow properties

and high-temperature resistance to

oxidation. However, it is generally

more costly than non-synthetic oil.

Review carefully the product

information published by the synthetic

oil manufacturer. Performance

additive systems often respond

differently in synthetic oil. Use of

synthetic oil does not change the

recommended oil change service

interval.

Coolant

Coolant is a mixture of water and

antifreeze. Under normal conditions,

it is a mixture of 50 percent water

and 50 percent antifreeze, but under

extreme cold weather conditions, as

much as 60 percent antifreeze can be

added. For reasons of anticorrosion

protection and to raise the boiling

point, the coolant with a minimum

50% of antifreeze must remain in the

cooling system all year round.

Regardless of mileage, replace

the coolant every two years since

the degree of corrosion protection

gradually drops with time.

Fully-Formulated Antifreeze

Antifreeze approved for use in the

MBE 900 engine is a mixture of

glycol compounds (either ethylene

glycol or propylene glycol), and

corrosion inhibitors. Antifreeze

containing glycol compounds and

corrosion inhibitors is known as

fully-formulated antifreeze.

Fully-formulated antifreeze has the

following properties:

□It protects the radiator and engine

from freezing.

□It provides protection against

corrosion and cavitation for all

components in the cooling system.

□It raises the boiling point of the

coolant. This slows the rate of

evaporation, avoiding coolant loss

at high temperatures.

58 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Water

Water containing no additives is

not suitable as a coolant, even if no

antifreeze protection is needed.

The water used in the coolant must

comply with certain requirements,

which are not always satisﬁed by

drinking water. If water quality is

inadequate, the water must undergo

suitable treatment.

The following types of water are

preferred for use in coolant:

□Distilled water

□Water puriﬁed by reverse osmosis

□De-ionized water

NOTICE:

In some areas, tap water can

contain high levels of dissolved

chlorides, sulfates, magnesium, and

calcium, causing scale deposits,

sludge deposits and/or corrosion.

These deposits can damage the

coolant pump and allow the engine

to overheat.

Coolant Speciﬁcations

To avoid damage to the cooling

system, use only an approved

corrosion-inhibiting antifreeze.

Approved antifreeze must be

fully-formulated and comply with

the requirements of the Truck

Maintenance Council (TMC). Coolant

speciﬁcations are listed in Table

2. Detroit Diesel POWER COOL

products meet these speciﬁcations

and are recommended.

Coolant Concentration

When topping off the cooling system

after a drop in the coolant level, the

concentration of corrosion-inhibiting

antifreeze in the coolant must be

50 percent by volume. This affords

protection down to a temperature of

–37°C(–34°F). The cooling mixing

ratio is listed in Table 3.

Type of Coolant Requirement

Fully-Formulated Ethylene Glycol TMC RP-329 Type "A"

Fully-Formulated Propylene Glycol TMC RP-330 Type "A"

Water plus Corrosion Inhibitors Temperature Must Not Fall Below

0°C (32°F)

Table 2 Coolant Speciﬁcations

All information subject to change without notice. (Rev. 04/08) 59

SERVICE PRODUCTS

Antifreeze Protection

Down to °C (°F)

Water %

by Volume

Corrosion - Inhibiting

Antifreeze % by Volume

–37 (–34) 50 50 minimum

–52 (–62) 40 ThecoolingmixratioisMax.60

Table 3 Coolant Mixing Ratio

Important: If the concentration

is too low, there is risk of

corrosion/cavitation in the cooling

system.

For information about coolant in

cold weather operation, see the

heading "Winter Coolant Antifreeze

Protection" later in this chapter.

Supplemental Coolant Additives

for Fully Formulated Coolant

The concentrations of some inhibitors

will gradually deplete during normal

engine operation. SCAs replenish

the protection for cooling system

components. The coolant must

be maintained with the proper

concentration of SCA. Detroit Diesel

POWER COOL maintenance SCAs

are recommended.

NOTICE:

Failure to properly maintain coolant

with SCA can result in damage

to the cooling system and its

related components. Conversely,

over-concentration of SCA inhibitor

can result in poor heat transfer,

leadingtoenginedamage.

Always maintain concentrations at

recommended levels. Do not use

traditional SCAs with NOAT coolant.

The proper application of SCA will

provide:

□pH control

□Restored inhibitor levels to prevent

corrosion

□Water-softening to deter formation

of mineral deposits

□Cavitation protection to protect

wet sleeve cylinder liners

60 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Dropout

Excessive amounts of some corrosion

inhibitors can cause a gel or crystalline

deposit that reduces both heat transfer

and coolant ﬂow. This deposit is

called "dropout."

Dropout takes the color of the coolant

when wet, but becomes a white or gray

powder when dry. It can pick up solid

particles in the coolant and become

gritty. It will cause premature wear

of the coolant pump seals and other

components of the cooling system.

The wet gel can be removed using an

alkaline (non-acid) cleaner containing

either sodium nitrite or sodium

tetraborate.

If the gel is allowed to dry, it is

necessary to disassemble the engine

and clean it with a caustic solution,

or physically clean the individual

components.

Disposal

Coolants are biologically degradable

substances.

When disposing of used coolant,

comply with local legal requirements

and waste water regulations.

Consult the local water supply

authorities to determine the best

method of disposal.

A modern engine coolant has complex

tasks to perform. Do not allow any

form of "reprocessing" which consists

only of mechanical puriﬁcation.

Cold Weather Products

Special precautions must be taken

during cold weather. To protect your

engine, take the following special

measures in cold weather:

□Use special cold weather fuel and

engine oil.

□Check the concentration of

antifreeze in your coolant.

□Take special care of your batteries.

Winter-Grade Diesel Fuel

At low outside temperatures, parafﬁn

may separate from the diesel and

affect its ability to ﬂow freely.

Avoid breakdowns caused by this

problem (for example, blocked

ﬁlters) by using cold-resistant

winter-grade diesel fuel with improved

low-temperature ﬂow characteristics.

In most cases, winter-grade fuel can

be used without problems at cold

outside temperatures.

If using summer-grade fuel or a less

cold-resistant winter grade, a ﬂow

improver or kerosene can be added

with caution. The amount needed

depends on the outside temperature.

All information subject to change without notice. (Rev. 04/08) 61

SERVICE PRODUCTS

FIRE

To avoid increased risk of a fuel

ﬁre, do not mix gasoline and

diesel fuel.

Flow improver or petroleum spirit

must be mixed with diesel fuel

before its ﬂow characteristics have

been adversely affected by parafﬁn

separation. If changes have already

been caused by parafﬁn separation,

they can be corrected only by

heating the entire fuel system. Do

not add anything to cold-resistant

winter-grade diesel fuels. The fuel's

low-temperature ﬂow characteristics

could actually deteriorate with

additives.

Low-Viscosity Engine Oil

When changing the engine oil,

estimate the interval before your

next oil change. Choose an oil

from the SAE viscosity class

which corresponds to the outside

temperatures anticipated during this

period of operation. See Figure 28.

Figure 28 Engine Oil Temperature

Ranges

Winter Coolant Antifreeze

Protection

Before the temperature dips below

freezing, check the concentration of

antifreeze in the coolant. If necessary,

increase it.

Do not increase the proportion

(mixing ratio) of corrosion-inhibiting

antifreeze beyond 55 percent by

volume (this gives the maximum

antifreeze protection). Further

increases in the mixing ratio would

reduce the level of antifreeze

protection and adversely affect the

coolant's ability to dissipate heat.

Batteries

Batteries should receive more frequent

maintenance and recharging during

the cold season of the year.

62 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Careful maintenance and low current

consumption will help to maintain the

full battery charge. Starting capacity

drops severely in cold weather. For

example, at –10°C (14°F) starting

capacity is only about 60 percent

of normal. If the engine is shut

down or out of use for an extended

period of time, store the batteries

out of the vehicle in a heated area

if possible. Ensure good ventilation

when recharging.

All information subject to change without notice. (Rev. 04/08) 63

TECHNICAL DATA

General technical information is

listed in Table 4.

4-Cylinder Engines 6-Cylinder Engines

Description 904 924 906 926

Engine Type Vertical, inline cylinder block with turbocharger

and charge-air cooler

Cooling System Liquid Circuit

Combustion Principle 4-Stroke direct-injection diesel

Number of Cylinders 46

Bore 4.02 in

(102 mm) 4.17 in

(106 mm) 4.02 in

(102 mm) 4.17 in

(106 mm)

Stroke 5.11 in

(130 mm) 5.35 in

(136 mm) 5.11 in

(130 mm) 5.35 in

(136 mm)

Displacement (total) 259 in³

(4.25 liters) 262 in³

(4.8 liters) 389 in³

(6.37 liters) 439 in³

(7.2 liters)

Compression Ratio 18.0:1 17.5:1

Starting Speed Approximately 100 rpm

Direction of Engine

Rotation (viewed from

ﬂywheel) Counterclockwise

Starter Electric Motor

Cold-Start

Temperature Limit

(Without starting aids

and with battery 75%

charged)

The engine starts quickly without additional cold start

device in temperatures down to -15°C (+5°F).

An optional grid heater provides easy starting in

extreme temperatures down to -25°C (-13°F).

For temperatures below -25°C (-13°F) an optional

grid heater with preheating for coolant and lube oil is

available.

Table 4 General Technical Information

64 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Engine Data for EGR

Engine

The engine weights are listed in Table

5. The engine dimensions are

listed in Table 6. Also see Figure 29

and Figure 30. Coolant and lubricating

oil capacities are listed in Table 7

Engine Engine Dry

Weight

4-Cylinder 420 kg 926 lb)

6-Cylinder 560 kg (1235 lb)

Table 5 Engine Weights

4-Cylinder 6-Cylinder

A = 1025 mm

(40.4 in.) A = 1219 mm

(48 in.)

B=686mm

(27 in.) B=810mm

(31.9 in.)

C = 1000 mm

(39.4 in.) C = 1060 mm

(41.7 in.)

Table 6 Engine Dimensions

Figure 29 Engine Measurements

(Side View)

Figure 30 Engine Measurements

(Front View)

Description 4-Cylinder Engine 6-Cylinder Engine

Coolant Capacity* Max. 8 L (8.5 qt) Max. 12.5 L (13.2 qt.)

Lubricating Oil

Capacity** Max. 15.8 L (16.7 qt) Max. 29 L (30.6 qt)

*Does not include capacity of cooling system.

**For standard oil pan.

Table 7 Coolant and Lubricating Oil Capacity

All information subject to change without notice. (Rev. 04/08) 65

TECHNICAL DATA

Engine Data for Non-EGR

Engine

The engine weights are listed in Table

8. The engine dimensions are

listed in Table 9. Also see Figure 31

and Figure 32. Coolant and lubricating

oil capacities are listed in Table 10.

Engine Engine Dry

Weight

4-Cylinder 395 kg (871 lb)

6-Cylinder 530 kg (1169 lb)

Table 8 Engine Weights

4-Cylinder 6-Cylinder

A = 1025 mm

(40.4 in.) A = 1219 mm

(48.0 in.)

B=686mm

(27.0 in.) B=810mm

(31.9 in.)

C=925mm

(36.4 in.) C=940mm

(37.0 in.)

Table 9 Engine Dimensions

Figure 31 Engine Measurements

(Side View)

Figure 32 Engine Measurements

(Front View)

Description 4-Cylinder Engine 6-Cylinder Engine

Coolant Capacity* Max. 8.5 L (9.0 qt.) Max. 12.5 L (13.2 qt.)

Lubricating Oil

Capacity Max. 15.8 L (16.7 qt) Max. 29.0 L (30.6 qt)

*Does not include capacity of cooling system.

**For standard oil pan

Table 10 Coolant and Lubricating Oil Capacity

66 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Testing and Adjusting

Values

Valve lash checking and adjustments

are listed in Table 11. Engine

Oil Pressure is listed in Table 12.

Coolant thermostat conditions are

listed in Table 13. Injector pressures

are listed in Table 14.

Valve Type Check For:

mm ( in.)

Adjust To:

mm ( in.)

Intake 0.30 to 0.60 (0.012 to 0.024) 0.016 (0.40)

Exhaust 0.50 to 0.80 (0.020 to 0.032) 0.60 (0.024)

Table 11 Valve Lash Checking and Adjustment

Engine Speed Minimum Pressure

At idling rpm 50 kPa (7 psi)

At maximum rpm 250 kPa (36 psi)

Table 12 Engine Oil Pressure

Condition Speciﬁcation

Starts to open 81 to 85°C (177 to 185°F)

Fully open 95°C (203°F)

Minimum lift 8 mm ( 0.3 in.)

Table 13 Coolant Thermostat

Opening Pressure Value in kPa (psi)

Minimum opening pressure 24,497 (3,553)

Maximum opening pressure 25,697 (3,727)

Table 14 Injector Pressure

All information subject to change without notice. (Rev. 04/08) 67

MAINTENANCE

When performed on a regular basis,

changing the engine oil and ﬁlters is

the least costly way of obtaining safe

and reliable vehicle operation. Added

beneﬁts and savings occur when you

check that the valves, fuel injectors,

and oil and cooling circuits are in good

working order during oil changes.

The maintenance section of this

manual explains when you should

change your oil and what to look for

when checking for wear or damage.

For additional information, please

contact your regional ofﬁce.

Scheduled Intervals

All service intervals and maintenance

operations are based on the parts and

accessories expressly approved for

your engine.

The scope and frequency of

maintenance work are determined

by the engine's operating conditions:

severe duty, short haul, long haul or

operating hours vs. fuel consumption

(oil drain interval only).

Evidence of regular maintenance is

essential if a warranty claim has to be

submitted.

If optional equipment is installed, be

sure to comply with the maintenance

requirements for these extra items.

Important: If the engine is stored for

more than 18 months, the oil must

be changed before the engine can be

brought into service.

Maintenance Schedule Types

There are ﬁve types of maintenance

schedule:

□Schedule I (Severe Service)

□Schedule II (Short Haul)

□Schedule III (Long Haul)

□Operating Hours vs. Fuel

Consumption (Oil Drain Interval

Only)

□UNIMOG Service Schedule

To determine which schedule to use,

ﬁnd the distance traveled by the

vehicle in a year, regardless of vehicle

type.

Severe Service — Applies to

vehicles that annually travel up to

100,000 kilometers (60,000 miles) or

that operate under severe conditions.

Examples of Severe Service usage

include: operation on extremely poor

roads or where there is heavy dust

accumulation; constant exposure

to extreme hot, cold, salt-air, or

other extreme climates; frequent

short-distance travel; construction-site

68 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

operation; city operation (ﬁre truck,

garbage truck); or farm operation.

Short-Haul — Applies to vehicles

that annually travel up to 100,000

kilometers (60,000 miles) and operate

under normal conditions. Examples

of Short-Haul usage are: operation

primarily in cities and densely

populated areas; local transport with

infrequent freeway travel; or high

percentage of stop-and-go travel.

Long-Haul — Long Haul

(over-the-road transport) is for

vehicles that annually travel more than

100,000 kilometers (60,000 miles),

with minimal city or stop-and-go

operation. Examples of Long-Haul

usage are: regional delivery that

is mostly freeway miles; interstate

transport; or any road operation with

high annual mileage.

Operating Hours vs. Fuel

Consumption (Oil Drain Interval

Only) — Operating hours vs. fuel

consumption is for operators who

want an oil drain interval based on

hours of operation instead of miles

traveled. See Figure 33.

UNIMOG — The UNIMOG engine

has long maintenance intervals.

Maintenance Schedule and

Interval Operations — The three

different schedules of vehicle usage

(severe, short haul, and long haul) are

listed in Table 15. For each schedule,

the appropriate distance interval

(in miles and kilometers) is given

for performing and repeating each

maintenance operation.

The descriptions of all maintenance

operations, indicating all maintenance

operation sets at which each operation

must be performed are listed in Table

15.

Maintenance Intervals — The

three maintenance interval tables show

which maintenance operation must

be performed at the actual distances

(in miles or kilometers) for each

maintenance operation (M1–M3). The

schedule of actual distances is based

on the intervals listed in Table 15. The

UNIMOG maintenance intervals for

replacement of ﬂuids and ﬁlters are

listed by operating hours.

The maintenance interval tables are:

□Maintenance Interval Table,

Severe Service (information

listed in Table 16)

□Maintenance Interval Table, Short

Haul (information listed in Table

17)

□Maintenance Interval Table, Long

Haul (information listed in Table

18)

All information subject to change without notice. (Rev. 04/08) 69

MAINTENANCE

□The UNIMOG maintenance

intervals for replacement of ﬂuids

and ﬁlters are listed in Table 21,

Table 22, Table 23, and Table 24.

Maintenance Operation Sets —

Each Maintenance Operations

Sets Table (M1 through M3) lists the

descriptions of only those maintenance

operations that must be performed

at that maintenance operation set.

Each maintenance operation set is

listed in Table 19 and Table 20.

Schedule Use

Before placing your new vehicle

in service, determine the correct

maintenance intervals that apply to

your intended use of the vehicle. Refer

to the Maintenance Schedule Table

to determine the distance interval at

which each maintenance operation

must be performed to comply with

your vehicle's schedule. A detailed

description of maintenance operations

can be found later in this section

When the vehicle reaches the actual

distance given for an interval, refer

to the Maintenance Interval Tables

to ﬁnd the Maintenance Operation

Set that applies to that interval. Then

perform the maintenance operations

listed in the applicable Maintenance

Interval Operation Table.

Complete each Maintenance

Operation Set at the required interval.

For example, when you have

completed Maintenance Operation

Set M3 under the 16th maintenance

number listed in the Maintenance

Interval Table, repeat the pattern. For

the 17th maintenance, do Maintenance

Operation Set M1, under the ﬁrst

maintenance number listed in the

Maintenance Interval Table.

NOTE:

For Severe Service, the pattern

repeats after 15 maintenance

numbers, not 16 (as for Short Haul

andLongHaul).

70 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Maintenance Tables and

Graphs

Maintenance Intervals

Maintenance

Schedule

Maint.

Interval

Operation

Frequency Miles Km

Maint. 1

(M1) every 6,000

(904/906/926) 9,650

(904/906/926)

Schedule I

(Severe Service)

vehicles that

annually travel

up to 6,000 miles

(9,650 km)

Maint. 2

(M2) every 18,000 29,000

Maint. 1

(M1) every 15,000

(904/906/926) 24,000

(904/906/926)

Maint. 2

(M2) every 60,000 96,500

Schedule II

(Short Haul)

vehicles that

annually

travel up to

60,000 miles

(96,500 km) Maint. 3

(M3) every 75,000 121,000

Maint. 1

(M1) every 20,000

(904/906/926) 32,000

(904/906/926)

Maint. 2

(M2) every 60,000 96,500

Schedule III

(Long Haul)

vehicles that

annually travel

more than

60,000 miles

(96,500 km)

Maint. 3

(M3) every 80,000 129,000

Table 15 Maintenance Schedule Table

All information subject to change without notice. (Rev. 04/08) 71

MAINTENANCE

Maint. No Maintenance

Interval Miles Km

1M1* 6,000 9,650

2 M1 12,000 18,000

3 M1 and M2 18,000 30,000

4 M1 24,000 40,000

5M1 30,000 50,000

6 M1 and M2 36,000 60,000

7M1 42,000 70,000

8 M1 48,000 80,000

9 M1 and M2 54,000 90,000

10 M1 60,000 96,500

11 M1 66,000 110,000

12 M1 and M2 72,000 120,000

13 M1 78,000 130,000

14 M1 84,000 140,000

15 M1 and M2 90,000 150,000

* 6-cylinder engines use a oil centrifuge ﬁlter to meet the above intervals,

the cartridge in the centrifuge has the same interval as the primary

ﬁlter. 4-cylinder engines will not use the oil centrifuge.

Table 16 Maintenance Intervals for Schedule I, Severe Service

72 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Maint. No. Maintenance

Interval Miles Km

1M1* 15,000 24,000

2 M1 30,000 48,000

3 M1 45,000 72,000

4 M1 and M2 60,000 96,500

5M1 and M3 75,000 120,000

6 M1 90,000 144,000

7M1 105,000 168,000

8 M1 and M2 120,000 192,000

9 M1 135,000 216,000

10 M1 and M3 150,000 241,000

11 M1 165,000 265,000

12 M1 and M2 180,000 289,000

13 M1 195,000 314,000

14 M1 210,000 338,000

15 M1 and M3 225,000 362,000

16 M1, M2 and M3 240,000 386,000

* 6-cylinder engines use a oil centrifuge ﬁlter to meet the above intervals,

the cartridge in the centrifuge has the same interval as the primary

ﬁlter. 4-cylinder engines will not use the oil centrifuge.

Table 17 Maintenance Intervals for Schedule II, Short Haul

All information subject to change without notice. (Rev. 04/08) 73

MAINTENANCE

Maint. No Maintenance

Interval Miles Km

1M1* 20,000 32,000

2 M1 40,000 64,000

3 M1 and M2 60,000 96,500

4 M1 and M3 80,000 128,000

5M1 100,000 160,000

6 M1 and M2 120,000 193,000

7M1 140,000 225,000

8 M1 and M3 160,000 257,000

9 M1 and M2 180,000 290,000

10 M1 200,000 322,000

11 M1 220,000 354,000

12 M1, M2 and M3 240,000 386,000

13 M1 260,000 418,000

14 M1 280,000 450,000

15 M1 and M2 300,000 482,000

16 M1 and M3 320,000 515,000

* 6-cylinder engines use a oil centrifuge ﬁlter to meet the above intervals,

the cartridge in the centrifuge has the same interval as the primary

ﬁlter. 4-cylinder engines will not use the oil centrifuge.

Table 18 Maintenance Intervals for Schedule III, Long Haul

74 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Figure 33 Oil Drain Interval — Operating Hours vs. Fuel Consumption

All information subject to change without notice. (Rev. 04/08) 75

MAINTENANCE

Operation Description M1 M2

Engine Inspecting

Fuel Preﬁlter Element Cleaning —

Main Fuel Filter Element Changing —

Valve Checking and Adjusting —

Engine Oil and Filter Changing, Replace 906 and 926 Oil

Centrifuge Cartridge

Coolant Concentration Checking

Coolant Flushing and Changing —

Cooling System Inspecting

Table 19 Required Maintenance Operations Sets, Schedule I

Maintenance Operation Description M1 M2 M3

Engine Inspecting —

Valve Lash Checking and Adjusting ——

Fuel Preﬁlter Element Cleaning —

Main Fuel Filter Element Changing —

Engine Oil and Filter Changing, Replace 906 and 926 Oil

Centrifuge Cartridge

Coolant Concentration Checking —

Coolant Flushing and Changing ——

Cooling System Inspecting —

Table 20 Required Maintenance Operations Sets, Schedule II and III

NOTE:

If oil drain intervals are measured by

operating hours, an extension of the

oil drain interval may be possible.

Refer to DDC publication Lubricating

Oil, Fuel and Filters Requirements

(7SE270) available on the DDC

extranet.

76 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

NOTE:

The engine oil and oil ﬁlter MUST be

changed EVERY 200 operating hours.

Operating Hours

Component Maintenance 200 700 1,400

Engine Change oil and oil ﬁlter Every 200 hours

Fuel System Change ﬁlter and vent system ——

Transmission Change oil ———

PTO Transmission Change oil and oil ﬁlter ———

Axle Gear Change oil ——

Change oil ﬁlter ——

Working Hydraulics Change oil and oil ﬁlter ———

Table 21 UNIMOG Service Intervals, 200 - 1400 Operating Hours

Operating Hours

Component Maintenance 2,100 2,800 3,500

Engine Change oil and oil ﬁlter Every 200 hours

Fuel System Change ﬁlter and vent system

Transmission Change oil ——

PTO Transmission Change oil and oil ﬁlter ——

Axle Gear Change oil —

Change oil ﬁlter ——

Working Hydraulics Change oil and oil ﬁlter ———

Table 22 UNIMOG Service Intervals, 2100 - 3500 Operating Hours

All information subject to change without notice. (Rev. 04/08) 77

MAINTENANCE

Operating Hours

Component Maintenance 4,200 4,900 5,600

Engine Change oil and oil ﬁlter Every 200 hours

Fuel System Change ﬁlter and vent system —

Transmission Change oil ——

PTO Transmission Change oil and oil ﬁlter ——

Axle Gear Change oil ——

Change oil ﬁlter —— —

Working

Hydraulics Change oil and oil ﬁlter ——

Table 23 UNIMOG Service Intervals, 4200 - 5600 Operating Hours

Operating Hours

Component Maintenance 6,300 7,000

Engine Change oil and oil ﬁlter Every 200 hours

Fuel System Change ﬁlter and vent system

Transmission Change oil —

PTO Transmission Change oil and oil ﬁlter —

Axle Gear Change oil —

Change oil ﬁlter ——

Working Hydraulics Change oil and oil ﬁlter —

Table 24 UNIMOG Service Intervals, 6300 - 7000 Operating Hours

78 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Required Maintenance

Operations

The following sections describe the

required maintenance operations

listed in Table 19 and 20.

Engine Inspecting

Inspect the engine as follows:

1. Visually check the engine for

signs of leakage. A slight

dampness at the sealing points is

no cause for alarm.

NOTE:

More severe leaks, combined with a

continual loss of oil, must be corrected

without delay.

2. Visually inspect all lines and

hoses. Listen for any sound of

leaking. Make sure all pipes and

hoses are undamaged, correctly

positioned to avoid chaﬁng, and

properly secured.

Valve Lash Checking and

Adjusting

Important: Adjust the valve lash

when the engine is cold. Wait at least

30 minutes after shutdown, even if the

engine ran only a short time.

The special tool listed in Table 25 is

required for this procedure.

Tool Description Manufacturer Part Number

Engine Cranking

Tool Kent-Moore J-46392

Table 25 Special Tool

All information subject to change without notice. (Rev. 04/08) 79

MAINTENANCE

Gaining Access To The Valves —

Gain access to the valves as follows:

NOTE:

Clean the cylinder head cover before

removing it.

1. Remove the cylinder head cover

(see Figure 34).

Figure 34 Cylinder Head Cover

2. Remove the inspection cover on

the timing case.

3. Fit the cranking device

listed in Table 25 into the

inspection hole on the timing case

(see Figure 35).

Figure 35 Inspection Hole in the

Timing Case

4. Select a method for adjusting the

valve lash. See Figure 36 for

the valve layout on both four-

and six-cylinder engines. There

are two acceptable methods for

adjusting valve lash:

• In order, according to the

timing sequence used for fuel

injection ("Method One”)

• By type of valve, depending on

crankshaft position ("Method

Two”)

80 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Figure 36 Cylinder and Valve

Layout

Method One: Adjust Each

Cylinder In Firing Order —

Method One allows you to adjust

each cylinder in the order in which

fuel is injected. The crankshaft must

be repositioned after each cylinder is

adjusted as listed in Table 26.

1. For each cylinder, use the

cranking device to rotate the

crankshaft until the piston is

exactly at top dead center (TDC)

in the compression stroke. The

valves must be closed and it must

be possible to turn the push rods

without effort.

NOTE:

Whenthepistonincylinder#1isat

ignition TDC, the valves of cylinder

#6 (cylinder #4 on the four-cylinder

engine) will overlap, meaning that both

intake and exhaust valves are partially

open, and show no measurable play

when tested with a feeler gauge.

2. Check each valve and adjust it (if

necessary), using the procedures

under the headings "Checking

Valve Lash" and "Adjusting Valve

Lash" in this section.

Engine Crankshaft

Position Cylinders

Ignition

Sequence 1 3 4 2 NA NA

4-Cylinder

Valve Overlap 4 2 1 3 NA NA

Ignition

Sequence 1536 2 4

6-Cylinder

Valve Overlap 6241 5 3

Table 26 Valve Adjustment- Method One

All information subject to change without notice. (Rev. 04/08) 81

MAINTENANCE

Method Two: Adjust All

Valves Using Two Crankshaft

Positions — Method two allows

you to adjust all the valves using just

two crankshaft positions.

1. Using the cranking device, turn

the crankshaft until cylinder #1 is

at the ignition TDC position (all

valves are closed) and cylinder #6

(cylinder #4 on the four-cylinder

engine) is at the valve overlap

position (all valves are open).

2. Check the valves listed in Table

27 in the "Ignition TDC" row

and adjust them (if necessary),

using the procedures under the

headings "Checking Valve Lash"

and "Adjusting Valve Lash."

3. Using the cranking device, turn

the crankshaft until cylinder #6

(cylinder #4 on the four-cylinder

engine) is at the ignition TDC

position (all valves are closed)

and cylinder #1 is at the valve

overlap position (valves are

open).

4. Using the same procedure, check

the valves listed in Table 27 in the

"Valve Overlap" row and adjust

them (if necessary), using the

procedures under the headings

"Checking Valve Lash" and

"Adjusting Valve Lash."

Cylinders/Valve Types*

Engine

Cylinder #1

Crankshaft

Position 1234 56

Ignition TDC I/E IE

—NA NA

4-Cylinder Valve Overlap —EII/E NA NA

Ignition TDC I/E IEI E

—

6-Cylinder Valve Overlap —EIE II/E

* I = Intake Valve and E = Exhaust Valve

Table 27 Valve Adjustment - Method Two

82 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Checking Valve Lash — Check

valve lash as follows:

1. For each valve, measure the valve

lash with a feeler gauge between

the rocker arm and valve stem

(exhaust valve) or valve bridge

(intake valve). It should be

possible to pull the feeler gauge

throughwithnomorethanlight

resistance.

2. If the value measured is within

the range listed in Table 28 in the

"Check For" column, check the

next valve.

If the value measured is outside the

range listed in Table 28 in the "Check

For" column, adjust the valve lash.

Adjusting Valve Lash — Adjust

valve lash as follows:

1. If adjustment is needed, loosen

the locknut. See Figure 37 for

intake valves and Figure 38 for

exhaust valves. Use the exact

settingslistedinTable28inthe

"Adjust To" column.

Figure 37 Intake Valves

Figure 38 Exhaust Valves

Valve Type Check For: Adjust to:

Intake 0.30 to 0.60 mm (0.012 to 0.024 in.) 0.40 mm (0.016 in.)

Exhaust 0.50 to 0.80 mm (0.020 to 0.032 in.) 0.60 mm(0.024 in.)

Table 28 Valve Lash Checking and Adjustment

All information subject to change without notice. (Rev. 04/08) 83

MAINTENANCE

2. Turn the adjusting screw until the

valve lash is correct using the

exact settings listed in Table 28.

Use the range only for checking

adjustment.

3. Tighten the locknut 25 N·m (18

lb·ft ).

4. Check the valve lash again.

Adjust again if necessary.

Restoring The Vehicle To

Operating Condition — Restore to

operating condition as follows:

1. Install the cylinder head cover.

SeeFigure39.

2. Remove the cranking device from

the inspection hole in the timing

case.

3. Replace the end cover on the

inspection hole and tighten the

bolts 25 N·m (18 lb·ft).

Fuel Preﬁlter Element

Cleaning

Clean the fuel preﬁlter element as

follows:

1. Open the fuel ﬁller cap to release

pressure in the fuel system.

Replace and tighten the cap.

2. Clean the outside of the preﬁlter

housing. Keep fuel away from

hoses or pipes located beneath the

ﬁlter. See Figure 40.

Figure 39 Cylinder Head Cover

Figure 40 Fuel Filters

3. Unscrew the cap on the fuel

preﬁlter. Pull the cap and ﬁlter

84 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

element out of the preﬁlter

housing. See Figure 41.

4. Clean the cap and the ﬁlter

element. If the ﬁlter element

is heavily soiled or damaged,

replace it.

5. Check the O-ring on the cap and

replace it if necessary.

6. Insert the ﬁlter element into the

preﬁlter housing and screw the

cap onto the housing. Tighten the

cap 25 N·m (18 lb·ft ).

Figure 41 Fuel Preﬁlter

7. Bleed the fuel system.

NOTICE:

Correct torque on the high pressure

lines is critical. Incorrect torques

could result in leaks or lack of power

due to restricted fuel ﬂow.

[a]Makesurethatall

high-pressure lines have

been tightened to 25 N·m (18

lb·ft) and all banjo bolts to 40

N·m (30 lb·ft).

[b] If equipped with a hand pump

on the fuel/water separator,

work the hand pump 50 times.

[c] Crank the engine for 30

seconds at a time, but no

longer. Before cranking the

engine again, wait at least two

minutes. The engine should

start within four 30-second

attempts.

All information subject to change without notice. (Rev. 04/08) 85

MAINTENANCE

Main Fuel Filter Element

Changing

Change the main fuel ﬁlter element as

follows:

1. Open the vehicle fuel tank ﬁller

cap to release pressure in the fuel

system. Replace and tighten the

cap.

2. Clean the outside of the fuel ﬁlter

housing. See Figure 40.

3. Using a 36-mm socket wrench

insert, unscrew the cap on the

fuel ﬁlter and remove it, along

with the ﬁlter element. Pull both

the cap and the ﬁlter element a

short distance out of the ﬁlter

housing. See Figure 42. Allow

the fuel to drain off the ﬁlter into

the housing.

4. Remove the cap with the ﬁlter

element. To release the ﬁlter

element, twist the lower edge of

the ﬁlter element to one side.

NOTICE:

To prevent damage to the ﬁlter

housing, do not allow dirt to get into

the ﬁlter housing. Do not empty the

dirt collector into the ﬁlter case.

5. Pull the dirt collector out of the

ﬁlter housing using the tabs on

either side.

Figure 42 Main Fuel Filter

6. Clean the cap and the dirt

collector.

7. Replace the O-ring.

8. Install the new ﬁlter element

in the cap. Make sure the ﬁlter

element is securely in place.

9. Insert the dirt collector into the

ﬁlter housing. Make sure the dirt

collector is positioned properly in

the ﬁlter housing.

10. Screw on the cap with the ﬁlter

element. Tighten the cap 25 N·m

(18 lb·ft).

86 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

NOTICE:

Correct torque on the high pressure

lines is critical. Incorrect torques

could result in leaks or lack of power

due to restricted fuel ﬂow.

11. Bleed the fuel system.

[a] Make sure that all

high-pressure lines have

been tightened to 25 N·m (18

lb·ft)) and all banjo bolts to

40 N·m (30 lb·ft).

[b] If equipped with a hand pump

on the fuel/water separator,

workthehandpump50times.

[c] Crank the engine for 30

seconds at a time, but no

longer. Before cranking the

engine again, wait at least two

minutes. The engine should

start within four 30-second

attempts.

12. Start the engine. Check the fuel

ﬁlter for leaks.

Engine Oil and Filter

Changing

FIRE

To avoid injury from ﬁre, keep

open ﬂames, sparks, electrical

resistance heating elements, or

other potential ignition sources

away when draining lubrication

oil. Do not smoke when draining

lubricating oil.

NOTE:

Select the SAE class (viscosity) on the

basis of the average air temperature

for the season. See Figure 43. View

the temperature ranges for the various

SAE classes as guidelines which can

be exceeded for only a short time.

Figure 43 SAE Oil Viscosity

Classes

All information subject to change without notice. (Rev. 04/08) 87

MAINTENANCE

To insure the engine is protected

and the oil stays clean until the next

oil change, use only oils of API

classiﬁcation CI4.

The six-cylinder EGR engines have

an oil centrifuge and an oil ﬁlter.

Non-EGR engines have only an oil

ﬁlter.

NOTICE:

Both the primary lube oil ﬁlter (front

of engine) and the oil centriguge

cartridge (side of engine) must be

replaced at each oil drain interval.

Change the oil ﬁlter as follows:

1. Chock the tires, place the

transmission in neutral, and set

the parking brake.

NOTE:

Change the engine oil only when the

engine is at an operating temperature

of approximately 82°C (180°F).

2. Using a 36-mm socket, unscrew

the oil ﬁlter cap. See Figure 44.

Figure 44 Oil Filter Cap

3. Place a suitable receptacle

beneath the oil drain plug on the

underside of the oil pan. Carefully

unscrew the oil drain plug on the

oil pan and allow the oil to drain

out. See Figure 45. Discard the

O-ring on the oil drain plug.

Figure 45 Engine Oil Drain Plug,

Oil Pan

4. Remove both the ﬁlter cap and

the ﬁlter element. To release the

88 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

ﬁlter element, twist the lower

edge of the ﬁlter element to the

side. See Figure 46.

Figure 46 Cap with Oil Filter

Element

NOTICE:

To prevent damage to the ﬁlter

housing, ensure that no foreign

objects get inside it. Do not wipe

clean the ﬁlter housing.

5. Replace the O-ring on the cap.

SeeFigure46.

6. Install the new ﬁlter into the cap.

Make sure the ﬁlter element is

securely in place.

7. Screw the cap onto the oil ﬁlter

housing. Tighten the cap 25 N·m

(18 lb·ft).

8. Install the oil drain plug, using a

new O-ring. Tighten the plug 65

N·m (48 lb·ft).

9. Add new engine oil through the

oil ﬁll (see Figure 47).

Figure 47 Oil Fill

PERSONAL INJURY

To avoid injury from slipping and

falling, immediately clean up any

spilled liquids.

NOTE:

Engine oil ﬁll capacity with a standard

oil pan for the six-cylinder engine

is 30.6 quarts (29.0 L). For the

four-cylinder engine with a standard oil

pan, ﬁll capacity is 16.7 quarts (15.8

L).

10. Fill until the maximum ﬁll level

on the oil dipstick has been

reached. Do not overﬁll.

All information subject to change without notice. (Rev. 04/08) 89

MAINTENANCE

NOTICE:

Keep the engine running at idling

speed until an oil pressure reading is

obtained. If no oil pressure is shown

after approximately 10 seconds,

stop the engine and determine the

cause. Failure to do so could result

in engine damage.

11. Start the engine with the

accelerator pedal in the idle

position. Monitor the oil pressure

gauge.

12. Check the ﬁlter and oil drain plug

for signs of leakage.

13. Stop the engine.

14. Check the oil level again after

approximately ﬁve minutes.

If necessary, add oil up to the

maximum ﬁll level on the oil

dipstick. Do not overﬁll.

Oil Centrifuge

The MBE six-cylinder engines

(906/926) have an oil centrifuge.

NOTICE:

Both the primary lube oil ﬁlter (front

of engine) and the oil centriguge

cartridge (side of engine) must be

replaced at each oil drain interval.

Change the oil centrifuge cartridge as

follows:

1. Remove the cover of the oil

centrifuge. See Figure 48.

Figure 48 Oil Centrifuge

2. Lift out the dirty cartridge and

replace it with a clean one

(see Figure 49).

Figure 49 Centrifuge Cartridge

3. Replace the centrifuge cover,

tighten the cap 40 Nm (30 lb·ft).

90 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Coolant Concentration

Checking

Check coolant concentration as

follows:

HOT COOLANT

To avoid scalding from the

expulsion of hot coolant, never

remove the cooling system

pressure cap while the engine is

at operating temperature. Wear

adequate protective clothing

(face shield, rubber gloves,

apron, and boots). Remove the

cap slowly to relieve pressure.

1. Open the cap on the surge tank

slowly, to allow excess pressure

to escape. Set the cap aside.

NOTE:

Check and correct the coolant level

only when the coolant temperature is

below 50°C (122°F).

2. Before adding coolant,

use a suitable tester to

check the concentration of

corrosion-inhibiting antifreeze. If

the concentration is lower than

50% by volume, drain coolant/add

antifreeze until the concentration

is correct. The coolant mixing

ratio is listed in Table 29.

NOTE:

Concentrations of more than 55% by

volume should not be used, as this is

the level which affords the maximum

antifreeze protection, down to –45°C

(–49°F). Higher concentrations

adversely affect heat dissipation.

Antifreeze

Protection Down

to°C (°F)

Water Percentage

by Volume

Corrosion-Inhibiting

Antifreeze

Percentage by

Volume

–37 (–347) 50 50

–45 (–49) 45 Maximum 55

Table 29 Coolant Mixing Ratio

NOTICE:

If the concentration of antifreeze is

too low, there is a risk of corrosion

or cavitation in the cooling system.

NOTE:

When topping off, use only a

pre-prepared coolant mixture

containing a 50% concentration

All information subject to change without notice. (Rev. 04/08) 91

MAINTENANCE

by volume of corrosion-inhibiting

antifreeze.

3. Check the coolant level and add

more coolant if necessary.

4. Close and tighten the cap on the

surge tank.

92 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Coolant Flushing and

Changing

HOT COOLANT

To avoid scalding from the

expulsion of hot coolant, never

remove the cooling system

pressure cap while the engine is

at operating temperature. Wear

adequate protective clothing

(face shield, rubber gloves,

apron, and boots). Remove the

cap slowly to relieve pressure.

Flush and change the coolant as

follows:

1. Open the cap on the surge tank

slowly, to allow excess pressure

to escape. Set the cap aside.

2. Open the water regulating valve

for the heating system.

3. Drain the coolant from the engine.

See Figure 50. Coolant system

capacity is listed in Table 30.

[a] Place a receptacle underneath

the coolant drain plug.

Choose one that is large

enough to hold the expected

quantity of coolant.

Figure 50 Coolant Drain Plug

NOTE:

Make sure the coolant can ﬂow

unobstructed into the receptacle.

[b] Open the coolant drain plug

on the bottom of the radiator.

4. Flush the radiator.

NOTICE:

When ﬂushing the radiator, do not

apply more than 140 kPa (20 psi) air

pressure. Excessive pressure can

damage the radiator or heater core.

[a] Attach a ﬂushing gun nozzle

to the radiator outlet.

[b] Run water in until the radiator

is full.

All information subject to change without notice. (Rev. 04/08) 93

MAINTENANCE

EYE INJURY

To avoid injury from ﬂying debris

when using compressed air, wear

adequate eye protection (face

shield or safety goggles) and do

not exceed 276 kPa (40 psi) air

pressure.

[c] Apply no more than

140 kPa (20 psi) air pressure

intermittently to help dislodge

sediment buildup in the core.

5. Drain the radiator, and ﬂush the

radiator until clean water ﬂows

from the radiator. Remove the

ﬂushing gun.

6. When the coolant has drained,

install the coolant drain plug on

the radiator.

7. Add coolant in the speciﬁed

concentration until the maximum

mark on the surge tank is reached.

Coolant system capacity is

listed in Table 30.

Description 4-Cylinder 6-Cylinder

Engine Coolant Capacity (all vehicles) L (Qt)

Engine capacity 8 (8.5) 12 (12.7)

Business Class Coolant System Capacity L (Qt)

Total capacity 19.8 (21) 23.6 (25)

Antifreeze quantity at 50% 9.9 (10.5) 11.8 (12.5)

Antifreeze quantity at 55% 10.8 (11.5) 13.1 (13.8)

Table 30 Coolant System Capacity

8. Start the engine and run it for

about one minute at varying

speeds to release air pockets in

the cooling system. Make sure

the heater valve is still open.

Check the coolant level and add

more coolant if necessary.

9. Shut down the engine.

10. Add coolant if necessary.

94 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Cooling System Inspecting

HOT COOLANT

To avoid scalding from the

expulsion of hot coolant, never

remove the cooling system

pressure cap while the engine is

at operating temperature. Wear

adequate protective clothing

(face shield, rubber gloves,

apron, and boots). Remove the

cap slowly to relieve pressure.

NOTE:

Before doing this inspection, make

sure to do either maintenance

operation, "Coolant Concentration

Checking," or maintenance operation,

"Coolant Flushing and Changing."

Inspect the cooling system as follows:

1. Inspect the radiator, the

condenser, the coolant pump,

the engine oil cooler, the freeze

plugs, and the heat exchanger for

damage and leaks.

2. Check all pipes and hoses in the

cooling system for damage and

leaks. Make sure all pipes and

hoses are properly positioned to

avoid chaﬁng, and are securely

fastened.

3. Check the outside of the radiator

and condenser for blockage by

dirt or debris. Make sure the ﬁns

are not damaged, and straighten

them if necessary.

All information subject to change without notice. (Rev. 04/08) 95

CUSTOMER ASSISTANCE

The satisfaction and good will of the

owners of Detroit Diesel engines are

of primary concern to Detroit Diesel

Corporation and its distributor/dealer

organizations.

96 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

DDC NORTH AMERICAN NAFTA ON-HIGHWAY OFFICES

EASTERN REGION 1

Suwanee, Georgia

3325 Paddocks Parkway

Suwanee, GA 30024

Telephone: 678-341-6100

Fax: 678-341-6150

EASTERN REGION 2

Detroit, Michigan

13400 Outer Drive West

Detroit, MI 48239-4001

Telephone: 313-592-5420

Fax: 313-592-5887

WESTERN REGION 1

Irvine, California

7700 Irvine Center, Suite 275

Irvine, CA 92618

Telephone: 949-753-7710

Fax: 949-753-7711

WESTERN REGION 2

Irvine, California

7700 Irvine Center, Suite 275

Irvine, CA 92618

Telephone: 949-753-7710

Fax: 949-753-7711

CANADIAN REGION

London, Ontario

Detroit Diesel of Canada, Ltd.

150DufferinAve.,Suite701

London, ON N5A 5N6

Phone: 519-661-0149

Fax: 519-661-0171

All information subject to change without notice. (Rev. 04/08) 97

CUSTOMER ASSISTANCE

MTU DETROIT DIESEL OFF-HIGHWAY SALES AND

CUSTOMER ASSURANCE CENTERS

CONSTRUCTION, INDUSTRIAL

AND MINING SALES (BX7)

13400 Outer Drive, West

Detroit, MI 48239-4001

Phone: 313-592-5608

Fax: 313-592-5625

MARINE SALES (BX6)

13400 Outer Drive, West

Detroit, MI 48239-4001

Phone: 313-592-7806

Fax: 313-592-5137

POWERGEN AND OIL FIELD SALES

(BX11)

13400 Outer Drive, West

Detroit, MI 48239-4001

Phone: 313-592-5708

Fax: 313-592-5158

GOVERNMENT SALES (BX9)

13400 Outer Drive, West

Detroit, MI 48239-4001

Phone: 313-592-5875

Fax: 313-592-5158

CUSTOMER ASSURANCE (M24)

13400 Outer Drive, West

Detroit, MI 48239-4001

Phone: 313-592-5550

Fax: 313-592-5717

98 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

DDC INTERNATIONAL REGIONAL OFFICE LOCATIONS

DETROIT DIESEL DISTRIBUTION

CENTER B.V. (On/Off-Highway)

The Netherlands

Ridderpoort 9

2984 Ridderkerk

The Netherlands

Phone: (31) 180-442-900

Fax: (31) 180-462-062

LATIN AMERICAN REGION

(Off-Highway)

Miami, Florida

2277 N.W. 14th Street

Latin America Building

Miami, FL 33125-0068

Phone: 305-637-1555

Fax: 305-637-1580

MTU DETROIT DIESEL AUSTRALIA

PTY. LTD. (On/Off-Highway)

Victoria – Melbourne

488 Blackshaws Road

Altona North, Victoria. 3025

Australia

Phone: (61) 3 9243-9292

Fax: (61) 3 9243-9271

MTU ASIA PTE. LTD. (Off-Highway)

Singapore

No. 1 Benoi Place

Singapore 629923

Phone: (65) 6861-5922

Fax: (65) 6861-3615 Sales Marine,

Rail, C & I, Electronics

Fax: (65) 6860–9959 Sales

PowerGen, Defense

MEXICO (On/Off-Highway)

Detroit Diesel Allison de Mexico, S.A.

Av. Santa Rosa 58

Col. Ampliacion Norte

San Juan Ixtacala, Tlanepantla

C.P. 54160, Edo de Mexico

Phone: 52 55-5333-1803

Fax: 52 55-5333-1875

All information subject to change without notice. (Rev. 04/08) 99

CUSTOMER ASSISTANCE

Working with DDC Service

Outlets

As the owner of a Detroit Diesel

product you have a complete network

of over 1,000 Detroit Diesel service

outlets in the U.S. and Canada, plus

many outlets worldwide that are

prepared to meet your parts and

service needs:

□Service by trained personnel

□Sales teams to help determine your

speciﬁc power requirements

□In many areas, emergency service

24 hours a day

□Complete parts support including

reliabilt® remanufactured parts

□Product information and literature

We recognize however, that despite

the best intentions of everyone

concerned, misunderstandings may

occur. Normally, any situation

that arises in connection with the

sale, operation, or service of your

product will be handled by the

authorized service outlet in your area

(in the U.S. and Canada check the

Yellow Pages or service locator at

www.detroitdiesel.com for the Detroit

Diesel service outlet nearest you).

To further assure your complete

satisfaction, we have developed the

following procedure to use if you have

a problem that has not been handled

satisfactorily.

Step One

Discuss your problem with a member

of management from the authorized

service outlet. Frequently, complaints

are the result of a breakdown in

communication and can quickly be

resolved by a member of management.

If you have already discussed the

problem with the Sales or Service

Manager, contact the General

Manager. If your complaint originates

with a dealer, explain the matter

to a management member of the

distributorship with whom the dealer

has his service agreement.

Step Two

When it appears that your problem

cannot readily be resolved at the

distributor level without additional

assistance, contact the Detroit

Diesel Regional Product Support or

Operations Manager responsible for

your local distributor. You will be

assisted by a member of the Manager's

staff, depending upon the nature of

your problem.

Prior to this contact, have the

following information available:

□Engine model and serial number*

□Name and location of authorized

service outlet

□Type and make of equipment

100 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

□Engine delivery date and

accumulated miles or hours

of operation

□Nature of problem

□Chronological summary of

engine's history

Step Three

If you are still not satisﬁed, present the

entire matter in writing or by phone to:

Sr. Vice President, Parts, Service

and Customer Assurance

Detroit Diesel Corporation

13400 Outer Drive, West

Detroit, Michigan 48239–4001

Phone: 1–313–592–5000

Fax: 1–313–592–7244

When contacting the regional or

home ofﬁce, please keep in mind that

ultimately your problem will likely

be resolved at the distributorship or

dealership, utilizing their facilities,

equipment, and personnel. Therefore,

it is suggested that you ﬁrst follow

the previously mentioned steps

in sequence when experiencing a

problem.

All information subject to change without notice. (Rev. 04/08) 101

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900 ENGINES USED

IN ON-HIGHWAY VEHICLE APPLICATIONS

LIMITED WARRANTY ON NEW DETROIT DIESEL

MBE900ENGINESUSEDINON-HIGHWAYVEHICLE

APPLICATIONS

Terms of Coverage

Uses

This warranty applies to the ﬁrst retail

purchaser and subsequent owners

during the WARRANTY PERIOD of

new Detroit Diesel MBE 900 Engines

(referred to as Engine) manufactured

by Detroit Diesel Corporation and/or

suppliedbyDetroitDiesel Corporation

or Detroit Diesel of Canada Limited

(which are collectively referred to as

DDC) for use in on-highway vehicle

applications operated in the United

States or Canada.

Defects

This warranty covers Engine

REPAIRS to correct any malfunction

occurringduringtheWARRANTY

PERIOD resulting from defects in

material or workmanship.

Repairs

To obtain warranty repairs, you must

request the needed repairs within

theWARRANTYPERIODfroman

authorized DDC service outlet. Only

new genuine parts or remanufactured

parts or components supplied or

approved by DDC will be used. DDC

may, at its discretion, replace rather

than repair components. A reasonable

time must be allowed to perform

the warranty repair after taking the

engine to the authorized service outlet.

The owner is responsible for the

percentage of repair costs shown in

the warranty period chart. Repairs will

be performed during normal business

hours.

Warranty Period

The WARRANTY PERIOD begins

on the date the engine is delivered to

the ﬁrst retail purchaser or put in use

prior to sale at retail, whichever date

occurs ﬁrst, and ends at the time or

mileage/kilometer limits shown in the

WARRANTYPERIODchart.

102 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Warranty Period

Warranty Limitations

(Whichever Occurs First)

Repair Charges to be

Paid by Owner

Item

Months Miles/

Kilometers Parts Labor

Engine 0-36 0-150,000 mi

0-240,000 km No Charge No Charge

Accessories 0-24 0-100,000 mi

0-160,000 km No Charge No Charge

Table 31 Warranty Period Chart — On-highway Vehicle Applications

Like Replacement Engine

Engine(s) supplied by DDC as a

replacement for an engine still under

warranty will assume the identity

of the engine being replaced and be

entitled to the remaining warranty

coverage.

Service Supplies

The cost of service supplies such

as coolant, oil and ﬁlters which are

not reusable due to needed warranty

repairs is covered by this warranty.

Engine Removal and

Reinstallation

Reasonable labor costs for engine

removal and reinstallation, when

necessary to make a warranty repair,

are covered by this warranty.

This Warranty Does Not

Cover:

Repairs Due to Accidents,

Misuse, Storage Damage,

Negligence or Certain

Modiﬁcations

Repairs due to an accident, misuse,

misapplication, storage damage,

negligence or modiﬁcation exceeding

DDC speciﬁcations are not covered by

this warranty.

All information subject to change without notice. (Rev. 04/08) 103

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900 ENGINES USED

IN ON-HIGHWAY VEHICLE APPLICATIONS

Maintenance

DDC is not responsible for the

cost of maintenance or repairs

due to lack of performance of

required maintenance services as

recommended by DDC, or the

failure to use fuel, oil, lubricants and

coolant meeting DDC-recommended

speciﬁcations. Performance of the

required maintenance and use of

proper fuel, oil, lubricants and coolant

are the responsibility of the owner.

Incidental or Consequential

Damages

Detroit Diesel Corporation is

not responsible for incidental or

consequential costs or expenses which

the owner may incur as a result of

a malfunction or failure covered by

this warranty, such as communication

expenses, meals, lodging, overtime,

towing, loss of use of the engine or

vehicle (“downtime”), loss of time,

inconvenience, cargo loss or damage,

and other similar costs and expenses.

Other Limitations

Performance of REPAIRS is the

exclusive Owner's remedy under this

warranty. Detroit Diesel Corporation

does not authorize any person to

assume or create for it any other

obligation or liability in connection

with the engine or the accessories.

THIS WARRANTY AND

THE EMISSIONS CONTROL

WARRANTY ARE THE ONLY

WARRANTIES APPLICABLE

TOTHEENGINEASUSED

IN ON-HIGHWAY VEHICLE

APPLICATIONS. DETROIT DIESEL

CORPORATION MAKES NO

OTHER WARRANTIES EXPRESS

OR IMPLIED, INCLUDING

ANY IMPLIED WARRANTY

OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR

PURPOSE. DETROIT DIESEL

CORPORATION SHALL NOT BE

LIABLE FOR ANY INCIDENTAL

OR CONSEQUENTIAL DAMAGES

AS DESCRIBED ABOVE.

Some states do not allow the limitation

of how long this warranty may last

or the limitation or exclusion of

incidental or consequential damages,

so the above may not apply to you.

This warranty gives you speciﬁc legal

rights, and you may also have other

rights which may vary from state to

state.

104 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900

ENGINES USED IN SCHOOL BUS APPLICATIONS

Terms of Coverage

Uses

This warranty applies to the ﬁrst retail

purchaser and subsequent owners

during the WARRANTY PERIOD of

new Detroit Diesel MBE 900 Engines

(referred to as Engine) manufactured

by Detroit Diesel Corporation and/or

suppliedbyDetroitDiesel Corporation

or Detroit Diesel of Canada Limited

(which are collectively referred

to as DDC) for use in school bus

applications operated in the United

States or Canada.

Defects

This warranty covers Engine

REPAIRS to correct any malfunction

occurringduringtheWARRANTY

PERIOD resulting from defects in

material or workmanship.

Repairs

To obtain warranty repairs, you must

request the needed repairs within

theWARRANTYPERIODfroman

authorized DDC service outlet. Only

new genuine parts or remanufactured

parts or components supplied or

approved by DDC will be used. DDC

may, at its discretion, replace rather

than repair components. A reasonable

time must be allowed to perform

the warranty repair after taking the

engine to the authorized service outlet.

The owner is responsible for the

percentage of repair costs shown in

the warranty period chart. Repairs will

be performed during normal business

hours.

Warranty Period

The WARRANTY PERIOD begins

on the date the engine is delivered

to the ﬁrst retail purchaser or put in

use prior to sale at retail, whichever

date occurs ﬁrst, and ends at the

time or mileage/kilometer limits

listed in Table 32, the WARRANTY

PERIOD chart.

All information subject to change without notice. (Rev. 04/08) 105

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900 ENGINES USED

IN SCHOOL BUS APPLICATIONS

Warranty Period

Warranty Limitations

(Whichever Occurs First)

Repair Charges to be

Paid by Owner

Item

Months Miles/

Kilometers Parts Labor

Engine 0-60 0-150,000 mi

0-240,000 km No Charge No Charge

Accessories 0-24 0-100,000 mi

0-160,000 km No Charge No Charge

Table 32 Warranty Period Chart — School Bus Applications

Service Supplies

The cost of service supplies such

as coolant, oil and ﬁlters which are

not reusable due to needed warranty

repairs is covered by this warranty.

Like Replacement Engine

Engine(s) supplied by DDC as a

replacement for an engine still under

warranty will assume the identity

of the engine being replaced and be

entitled to the remaining warranty

coverage.

Engine Removal and

Reinstallation

Reasonable labor costs for engine

removal and reinstallation, when

necessary to make a warranty repair,

are covered by this warranty.

This Warranty Does Not

Cover:

Repairs Due to Accidents,

Misuse, Storage Damage,

Negligence or Certain

Modiﬁcations

Repairs due to an accident, misuse,

misapplication, storage damage,

negligence or modiﬁcation exceeding

DDC speciﬁcations are not covered by

this warranty.

106 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Maintenance

DDC is not responsible for the

cost of maintenance or repairs

due to lack of performance of

required maintenance services as

recommended by DDC, or the

failure to use fuel, oil, lubricants and

coolant meeting DDC-recommended

speciﬁcations. Performance of the

required maintenance and use of

proper fuel, oil, lubricants and coolant

are the responsibility of the owner.

Incidental or Consequential

Damages

Detroit Diesel Corporation is

not responsible for incidental or

consequential costs or expenses which

the owner may incur as a result of

a malfunction or failure covered by

this warranty, such as communication

expenses, meals, lodging, overtime,

towing, loss of use of the engine or

vehicle (“downtime”), loss of time,

inconvenience, cargo loss or damage,

and other similar costs and expenses.

Other Limitations

Performance of REPAIRS is the

exclusive Owner's remedy under this

warranty. Detroit Diesel Corporation

does not authorize any person to

assume or create for it any other

obligation or liability in connection

with the engine or the accessories.

THIS WARRANTY AND

THE EMISSIONS CONTROL

WARRANTY ARE THE ONLY

WARRANTIES APPLICABLE

TOTHEENGINEAS

USED IN SCHOOL BUS

APPLICATIONS. DETROIT DIESEL

CORPORATION MAKES NO

OTHER WARRANTIES EXPRESS

OR IMPLIED, INCLUDING

ANY IMPLIED WARRANTY

OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR

PURPOSE. DETROIT DIESEL

CORPORATION SHALL NOT BE

LIABLE FOR ANY INCIDENTAL

OR CONSEQUENTIAL DAMAGES

AS DESCRIBED ABOVE.

Some states do not allow the limitation

of how long this warranty may last

or the limitation or exclusion of

incidental or consequential damages,

so the above may not apply to you.

This warranty gives you speciﬁc legal

rights, and you may also have other

rights which may vary from state to

state.

All information subject to change without notice. (Rev. 04/08) 107

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900 ENGINES USED

IN FIRE TRUCK OR CRASH VEHICLE APPLICATIONS

LIMITED WARRANTY ON NEW DETROIT DIESEL

MBE 900 ENGINES USED IN FIRE TRUCK OR CRASH

VEHICLE APPLICATIONS

Terms of Coverage

Uses

This warranty applies to the ﬁrst retail

purchaser and subsequent owners

during the WARRANTY PERIOD of

new Detroit Diesel MBE 900 Engines

(referred to as Engine) manufactured

by Detroit Diesel Corporation and/or

suppliedbyDetroitDiesel Corporation

or Detroit Diesel of Canada Limited

(which are collectively referred to as

DDC) for use in ﬁre truck or crash

vehicle applications operated in the

United States or Canada.

Defects

This warranty covers Engine

REPAIRS to correct any malfunction

occurringduringtheWARRANTY

PERIOD resulting from defects in

material or workmanship.

Repairs

To obtain warranty repairs, you must

request the needed repairs within

theWARRANTYPERIODfroman

authorized DDC service outlet. Only

new genuine parts or remanufactured

parts or components supplied or

approved by DDC will be used. DDC

may, at its discretion, replace rather

than repair components. A reasonable

time must be allowed to perform

the warranty repair after taking the

engine to the authorized service outlet.

The owner is responsible for the

percentage of repair costs shown in

the warranty period chart. Repairs will

be performed during normal business

hours.

Warranty Period

The WARRANTY PERIOD begins

on the date the engine is delivered

to the ﬁrst retail purchaser or put in

use prior to sale at retail, whichever

date occurs ﬁrst, and ends at the

time or mileage/kilometer limits

listed in Table 33, the WARRANTY

PERIOD chart.

108 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Warranty Period

Warranty Limitations

(Whichever Occurs First)

Repair Charges to be

Paid by Owner

Item

Months Miles/

Kilometers Parts Labor

Engine 0-60 0-150,000 mi

0-240,000 km No Charge No Charge

Accessories 0-24 0-100,000 mi

0-160,000 km No Charge No Charge

Table 33 Warranty Period Chart — Fire Truck/Crash Vehicle

Applications

Like Replacement Engine

Engine(s) supplied by DDC as a

replacement for an engine still under

warranty will assume the identity

of the engine being replaced and be

entitled to the remaining warranty

coverage.

Service Supplies

The cost of service supplies such

as coolant, oil and ﬁlters which are

not reusable due to needed warranty

repairs is covered by this warranty.

Engine Removal and

Reinstallation

Reasonable labor costs for engine

removal and reinstallation, when

necessary to make a warranty repair,

are covered by this warranty.

This Warranty Does Not

Cover:

Repairs Due to Accidents,

Misuse, Storage Damage,

Negligence or Certain

Modiﬁcations

Repairs due to an accident, misuse,

misapplication, storage damage,

negligence or modiﬁcation exceeding

DDC speciﬁcations are not covered by

this warranty.

All information subject to change without notice. (Rev. 04/08) 109

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900 ENGINES USED

IN FIRE TRUCK OR CRASH VEHICLE APPLICATIONS

Maintenance

DDC is not responsible for the

cost of maintenance or repairs

due to lack of performance of

required maintenance services as

recommended by DDC, or the

failure to use fuel, oil, lubricants and

coolant meeting DDC-recommended

speciﬁcations. Performance of the

required maintenance and use of

proper fuel, oil, lubricants and coolant

are the responsibility of the owner.

Incidental or Consequential

Damages

Detroit Diesel Corporation is

not responsible for incidental or

consequential costs or expenses which

the owner may incur as a result of

a malfunction or failure covered by

this warranty, such as communication

expenses, meals, lodging, overtime,

towing, loss of use of the engine or

vehicle (“downtime”), loss of time,

inconvenience, cargo loss or damage,

and other similar costs and expenses.

Other Limitations

Performance of REPAIRS is the

exclusive Owner's remedy under this

warranty. Detroit Diesel Corporation

does not authorize any person to

assume or create for it any other

obligation or liability in connection

with the engine or the accessories.

THIS WARRANTY AND

THE EMISSIONS CONTROL

WARRANTY ARE THE ONLY

WARRANTIES APPLICABLE

TOTHEENGINEASUSEDIN

FIRE TRUCK OR CRASH VEHICLE

APPLICATIONS. DETROIT DIESEL

CORPORATION MAKES NO

OTHER WARRANTIES EXPRESS

OR IMPLIED, INCLUDING

ANY IMPLIED WARRANTY

OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR

PURPOSE. DETROIT DIESEL

CORPORATION SHALL NOT BE

LIABLE FOR ANY INCIDENTAL

OR CONSEQUENTIAL DAMAGES

AS DESCRIBED ABOVE.

Some states do not allow the limitation

of how long this warranty may last

or the limitation or exclusion of

incidental or consequential damages,

so the above may not apply to you.

This warranty gives you speciﬁc legal

rights, and you may also have other

rights which may vary from state to

state.

110 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900

ENGINES USED IN UNIMOG APPLICATIONS

Terms of Coverage

Uses

This warranty applies to the ﬁrst

retail purchaser and subsequent

owners during the WARRANTY

PERIOD of new Detroit Diesel

MBE 900 Engines (referred to as

Engine) manufactured by Detroit

Diesel Corporation and/or supplied by

Detroit Diesel Corporation or Detroit

Diesel of Canada Limited (which are

collectively referred to as DDC) for

use in UNIMOG applications operated

in the United States or Canada.

Defects

This warranty covers Engine

REPAIRS to correct any malfunction

occurringduringtheWARRANTY

PERIOD resulting from defects in

material or workmanship.

Repairs

To obtain warranty repairs, you must

request the needed repairs within

theWARRANTYPERIODfroman

authorized DDC service outlet. Only

new genuine parts or remanufactured

parts or components supplied or

approved by DDC will be used. DDC

may, at its discretion, replace rather

than repair components. A reasonable

time must be allowed to perform

the warranty repair after taking the

engine to the authorized service outlet.

The owner is responsible for the

percentage of repair costs shown in

the warranty period chart. Repairs will

be performed during normal business

hours.

Warranty Period

The WARRANTY PERIOD begins

on the date the engine is delivered

to the ﬁrst retail purchaser or put in

use prior to sale at retail, whichever

date occurs ﬁrst, and ends at the

time or mileage/kilometer limits

listed in Table 34, the WARRANTY

PERIOD chart.

All information subject to change without notice. (Rev. 04/08) 111

LIMITED WARRANTY ON NEW DETROIT DIESEL MBE 900 ENGINES USED

IN UNIMOG APPLICATIONS

Warranty Period

Warranty Limitations

(Whichever Occurs First)

Repair Charges to

be Paid by Owner

Item

Months Hours Miles/

Kilometers Parts Labor

Engine 24 Unlimited Unlimited No Charge No

Charge

Accessories 24 Unlimited Unlimited No Charge No

Charge

Table 34 Warranty Period Chart — UNIMOG Applications

Like Replacement Engine

Engine(s) supplied by DDC as a

replacement for an engine still under

warranty will assume the identity

of the engine being replaced and be

entitled to the remaining warranty

coverage.

Service Supplies

The cost of service supplies such

as coolant, oil and ﬁlters which are

not reusable due to needed warranty

repairs is covered by this warranty.

Engine Removal and

Reinstallation

Reasonable labor costs for engine

removal and reinstallation, when

necessary to make a warranty repair,

are covered by this warranty.

This Warranty Does Not

Cover:

Repairs Due to Accidents,

Misuse, Storage Damage,

Negligence or Certain

Modiﬁcations

Repairs due to an accident, misuse,

misapplication, storage damage,

negligence or modiﬁcation exceeding

DDC speciﬁcations are not covered by

this warranty.

112 All information subject to change without notice. (Rev. 04/08)

MBE 900 OPERATOR'S GUIDE

Maintenance

DDC is not responsible for the

cost of maintenance or repairs

due to lack of performance of

required maintenance services as

recommended by DDC, or the

failure to use fuel, oil, lubricants and

coolant meeting DDC-recommended

speciﬁcations. Performance of the

required maintenance and use of

proper fuel, oil, lubricants and coolant

are the responsibility of the owner.

Incidental or Consequential

Damages

Detroit Diesel Corporation is

not responsible for incidental or

consequential costs or expenses which

the owner may incur as a result of

a malfunction or failure covered by

this warranty, such as communication

expenses, meals, lodging, overtime,

towing, loss of use of the engine or

vehicle (“downtime”), loss of time,

inconvenience, cargo loss or damage,

and other similar costs and expenses.

Other Limitations

Performance of REPAIRS is the

exclusive Owner's remedy under this

warranty. Detroit Diesel Corporation

does not authorize any person to

assume or create for it any other

obligation or liability in connection

with the engine or the accessories.

THIS WARRANTY AND

THE EMISSIONS CONTROL

WARRANTY ARE THE ONLY

WARRANTIES APPLICABLE

TOTHEENGINEASUSED

IN UNIMOG APPLICATIONS.

DETROIT DIESEL CORPORATION

MAKES NO OTHER

WARRANTIES EXPRESS

OR IMPLIED, INCLUDING

ANY IMPLIED WARRANTY

OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR

PURPOSE. DETROIT DIESEL

CORPORATION SHALL NOT BE

LIABLE FOR ANY INCIDENTAL

OR CONSEQUENTIAL DAMAGES

AS DESCRIBED ABOVE.

Some states do not allow the limitation

of how long this warranty may last

or the limitation or exclusion of

incidental or consequential damages,

so the above may not apply to you.

This warranty gives you speciﬁc legal

rights, and you may also have other

rights which may vary from state to

state.

All information subject to change without notice. (Rev. 04/08) 113

DDC SVC MAN 0055 MB 900 MBE 926 Manual

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