965 0250 Onan BF (spec A F) Engine Service & Parts Manual (12 1987)

User Manual: 965-0250 Onan BF (spec A-F) Engine Service & Parts Manual (12-1987)

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Service
and
Parts
Manual

965-0250
12-87 (SPEC A-F)
Printed in U S A

Safety Precautions
It is recommendedthat you read your engine manual and

become thoroughly acquainted with your equipment before you start the engine.

DO NOT smoke or use an open flame in the vicinity of
the engine or fuel tank. Internal combustion engine
fuels are highly flammable.

Fuel lines must be of steel piping, adequately secured.
and free from leaks. Piping at the engine should be
approved flexible line. Do not use copper piping for
flexible lines as copper will work harden and become
brittle enough to break.
0

Be sure all fuel supplies have a positiveshutoff valve.

Exhswt System
0

Fuels, electrical equipment, batteries, exhaust gases and
moving parts present potentialhazardsthat could resultin
serious, personal injury. Take care in following these
recommended procedures.
Safety cadar
0 All local, state and federal codes should be consulted
and complied with.
0

This engine is not designed or intended for use in
aircraft. Any such use is at the owner's sole risk.
'

General
Provide appropriate fire extinguishersand installthem
inconvenientlocations. UseanextinguisherratedABC
by NFPA.
Make sure that all fasteners on the engine are secure
and accurately torqued. Keep guards in position over
fans, driving belts, etc.
If it is necessaryto makeadjustmentswhiletheengineis
running, use extreme caution when close to hot exhausts, moving parts, etc.
Protect Against Moving Parb
Do not wear loose clothing in the vicinity of moving
parts, such as PTO shafts, flywheels, b;lowers, coup
lings, fans, belts, etc.

Keep your hands away from moving parts.
B8tterler
Beforestarting work on the engine, disconnect batteries to prevent inadvertent starting of the engine.

DO NOT SMOKE while servicing batteries. Lead acid
batteriesgiveoffahighly explosivehydrogengaswhich
can be ignitedbyflame,electrical arcingor by smoking.
0

Verify batterypolarity before connecting batterycables.
Connect negative cable last.

Fuel System
0

DO NOT fill fuel tanks while engine is running.

Exhaust products of any internal combustion engine
are toxic andcan cause injury, or death if inhaled. All
engine applications, especially those within a confined
area, should be equipped with an exhaust system to
discharge gases to the outside atmosphere.

Do not use exhaust gases to heat a,compartment
Make sure that your exhaust system is free of leaks.
Ensure that exhaust manifolds are secure and are not
warped by bolts unevenly torqued.

Exhaust Gas is Deadly!
Exhaust gases contain carbon monoxide, a poisonousgas
that might cause unconsciousness and death. It is an
odorless and colorless gas formed during combustion of
hydrocarbon fuels. Symptoms of carbon monoxide poisoning,are:
Dizziness
0 'vomiting
0 Headache
0 Muscular Twitching
0 Weakness and Sleepiness
0 Throbbing in Temples
c

If you experienceany of thesesymptoms, get out intofresh
air immediately, shut down the unit and do not use until it
has been inspected.
The best protectionagainstcarbon monoxide inhalationis
properinstallationand regular, frequent inspections of the
complete exhaust system. If you notice a change in the
sound orappearanceof exhaustsystem, shut the unitdown
immediatelyand have it inspectedand repairedat oncebya
competent mechanic.

'Coonng System.
Coolants under pressure have a higher boiling point
than water. DO NOTopena radiatorpressurecap when
coolant temperature is above 212OF (lOO°C) or while
. engine is running.
K e e p the Unit and Surrounding Area Clean
Make sure that oily rags'are not left on or'near the
engine.
0

Remove all unnecessary grease and oil from the unit.
Accumulated grease and oil can causeoverheatingand
'subsequentengine damageand presenta potentialfire
hazard.
Redistribution or publication of this document,
by any means, is strictly prohibited.

. E4

TABLE

SERVICE MANUAL
FOR

OF
CONTENTS
GENERAL
I N FOR M A T I O N

I3
w

SPECIFICATIONS

GARDEN TRACTOR ENGINES

bIMENSIONS AND
CLEARANCES
ASS EMBLY
TORQUES

iNGlNE TROUBLE
SHOOTING
OIL S Y S T E M

FUEL S Y S T E M

BATTERY
CHARGING

STARTING
SYSTEM
ENGINE
DISASSEMBLY

PARTS CATALOGl2!
WE SUGGEST THIS BOOK BE KEPT HANDY FOR READY
REFERENCE, EITHER FOR ORDERING PARTS OR MAKING
ADJUSTMENTS.

ENGINE WIRING

Redistribution or publication of this document,
by any means, is strictly prohibited.

GENERAL INFORMATION

This manual contains proper information for the servicing and overhaul of your Onan engine. Use the parts
catalog in the rear portion of this book to help you with
disassembly and assembly procedures.

ENGINEMODELREFERENCE
Identify your model by referring to the MODEL and
SPEC (specification) NO. a s shown on the unit nameplate. Always use this number and the engine serial
number when making reference to your engine.

NOTE: Flywheel end of engine is considered the front.
Leif and righf sides are determined looking a t front
of engine.

How to interpret MODEL and SPEC NO.

If it is necessary to contact your dealer or the factory
about this engine, always supply the complete Model
and Spec Number a s well as the Serial Number shown
on the engine nameplate. The engine nameplate is
located on left side of blower housing (end opposite
oil filter).

3 4

I. Factory code for general identlfrcation purposes.
2. Specific Type:
S -MANUAL STARTING
MS ELECTRIC STARTING
3. Factory cbde for optional equipment supplied.
4. Specification (Spec Letter) advances with factory
production modification.

Refer to the Troubleshooting Guide for assistance in
locating and correcting troubles which may occur.
If a major repair or overhaul becomes necessary, the
erlgine should be carefully checked and necessary
repairs made by a competent mechanic. Maintain factory
limits and clearances as shown, replacing worn parts
when necessary.

0 AVOID POSSIBLE PERSONAL INJURY OR
QUIPMENT DAMAGE, AN AUTHORIZED SERW E REPRESENTATIVE MUST PERFORM A t 1
iERVlCE.

Redistribution or publication of this document,
by any means, is strictly prohibited.

SPEC1FICATIONS

.........................................
Onan
..............................
Four Cycle, AirGooled, Two Cylinder
........................................
16
.............................................
403 cu. in.
3-1/8inch
.................................................
2-5/8 inch
.......................................... 7 to 1
.......................................
Horizontal, Ductile Iron
...........................................
Yechanical,Poppet
....................................... Sleeve
...........................................
w/o filler
............................ 1 2 v o ~ , l 5 5 a m p4Fpints
lywheel~&~t~

Engine Manufacturer.
Engine Design.
Horsepower at 3600rpm
Displacement
Bore..................................................
Stroke
Compression Ratio
Crankhaft.
Valves
Bearings (yain and Rod)
Oil Capacity
BatteryuSystem

--UP

spEcIF1UTIOIIs

.....................................
.....................
........................................
......................

Tapeets(C0WLntake
Exhaust..........................-.....-...
Breaker Point Gap (Full Separation and Engine Cold)
SparkPlugCap
Ignition Timing (Engine Not Rruming, Cold Setting)

-005
.013

-025
.OS

* =om

* - Preferred setting.

Redistribution or publication of this document,
by any means, is strictly prohibited.

DIMENSIONS AND CLEARANCES
.

All dimensions and clearances given at room temperature of 7OoF
All values in inches unless otherwise specified

Minimum

CAMSHAFT AND CRANKSHAFT
Crankshaft Main Bearing Journal to Bearing Clearance
*Crankshaft End Play
Camshaft Bearing to Camshaft
Camshaft End Play
*Crankshaft Rod Journal t o Rod Bearing
Cqnnecting Rod End Play
Timing Gear Backlash
Oil Pump Gear Backlash

...............
.................................
............................
..................................
.......................
..............................
..................................
...............................

PISTON AND CYLINDER
'
Piston Pin in Piston . . . . . . . . . . . . . .

:..................
..................................
.............................

Piston Pin in Rod
*Piston Ring Gap in Cylinder
Piston Clearance 51 Cylinder.. Measured -10Below Oil
Control Ring. 90' from Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cylinder Bore - Standard Size
Crankshaft Main Bearing Journal - Standard Size . . . . . . . . . . . . . . . . . .
Crankshaft Rod Bearing Journal Standard Size
.. .. .. .. . . .. . . ... . . . . . . . . .
TAPPETS AND VALVES
*Valve Seat Width
*Valve Face Angle
*Valve Seat Angle
Valve Stem t o Guide Intake
:'
Valve Stem'to Guide Exhaust
;.
Tappet'to Cylinder Block Clearance
Tappet Adjustment (Cold)
*Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

............................
..................
E

Maximum

0.0015

0.0038
0.012
0.0030

0.003
0.0020
0.002
0.002
0.002

0.0033
0.016
0.003
0.005

0.0025
0.006

0.0002

0.0002
0.010

0.0004
0.0007
0.020

0.001
3.1245
1.9992
1.6252

0.003
3.1255
2.0000
1.6260

...Y....

...................................
...................................
...................................
.......................
....
.........................
.........................

1/32
'

440 .

1/8.

.. '450
0.0010
0.0025
0.0035
. 0.0040
0.0015
. 0.0030,
0.005
0.01 3

* .Frequently used overhaul values .

ASSEMBLY TORQUES AND SPECIAL TOOLS
BOLT TORQUE

...................

Gearcase Cover
Cylinder Head Stud Nuts (Cold) .........
Rear Bearing Plate Screws ............
Starter Mounting Bolts
Connecting Rod Bolt
Flywheel Cap Screw
Other 5/16 "Cylinder Block
Stud and Nuts
OilBase
Manifoid Mounting Screws
Oilhunp

...............
................
................
..................
.......................
.............
.......................

FT..LB .
8 .10
14 .16
25 .27
18 .20
14 .16
50 .55

The following special tools are available from Onan.
for further information see Tool Catalog 900-0019

Valve Seat Driver
Valve Guide Driver
Oil Guide and Driver
Combination Bearing Remover (Main and Cam)
Combination Bearing Driver (Main and Cam)
Flywheel Puller

8 .10
18-23
6 10
7- 9

Redistribution or publication of this document,
by any means, is strictly prohibited.

ENGINE TROUBLESHOOTING

Redistribution or publication of this document,
by any means, is strictly prohibited.

OIL SYSTEM
c

CRANKCASE 01L
Change crankcase oil every 50 operating hours and
only when engine is warm. (Exception: Drain initial
oil fill at 25 operating hours.)

.Do not overfill crankcase. Do not use
service DS oil. Do not mix brands
or grades of motor oil. Engine damage could result
from mixing non-compafible oils.

To drain, remove the 1/2 inch pipe plug on the rear
corner of the oil base. After oil drains, replace the
pipe plug and refill crankcase with 4 pints (4-1/2 if
equipped with filter) of a good quality detergent oil.
Oil must meet or exceed the API (American Petroleum
Institute) designation SE or SE/CC; this oil was
formerly designated a s MS, MS/DG or MS/DM (Figures
1 and 2).
For temperatures above 30"F, use SAE 30 oil; for
temperatures below 30 O F , use 5W30 or 1OW.
In extremely dusty conditions or in very cold weather,
change oil at least every 25 hours of operation.

01L DRAIN

- BO7TOM SIDE

REMOVE I/2 INCH PIPE
PLUG TO DRAIN

FIGURE 2. OIL DRAIN LOCATION

OIL FILTER (OPTIONAL)
Change the crankcase oil filter every 200 hours; change
more frequently in extremely dusty conditions. Remove
the filter by turning counterclockwise with a filter
wrench. Before installing a new filter, coat the gasket
on the filter base with a light fih of new oil. Install
by turning clockwise until a light friction is noted,
then turn an additional 1/2 turn.

N0TE:When checking oil, pull
out dipstick and wipe clean.
Replace and remove after 20
sec. or low reading may occur.

Crankcase Breather: This engine uses a crankcase
breather valve for maintaining crankcase vacuum. No
maintenance is generally required. If the crankcase
becomes pressurized a s evidenced by oil leaks at the
seals, clean baffle and valve in a suitable solvent.
See Figure 3.
Redistribution or publication of this document,

FIGURE I. CRANKCASE OIL FILL

by any means, is strictly prohibited.

HEX HEAD
CAP SCREW

O I L PUMP IN

CRANKCASE TURN

ON LEFT SIDEUNSCREW OIL PUMP
FROM INTAKE CU
To reassemble revers

I
OIL PUMP ASSEHB

.,,A /
FIGURE 4. OIL PUMP ASSEMBLY

Check the oil pump thoroughly for worn parts. Oil the
pump to prime it before reinstalling. Except for gaskets
and suction cup, the component parts of the pump are
not available individually. Install a new pump assembly
if required.
W A S H E R -.

If new oil pump gaskets are installed, they should be
the same thickness as those removed. A gasket kit with
various thickness gaskets is available.

cfJ

REEDVALVE

ATHER BAFFLE

OIL BY-PASS VALVE
The by-pass valve (located to the right and behind gear
cover), controls oil pressure by allowing excess oil to
flow directly back to the crankcase. Normally the valve
begins to open about 3Opsi.
The valve is non-adjustable and normally does not need
maintenance. To determine if valve is not working
'

correctly, caused by a sticky plunger, inspect as
follows:

1. Remove 3/8 x 24 x 1 cap screw located behind gear

GASKET HAS A
CORRECTWAY
AND
AN INCORRECT WAY
T O INSTALL. CHECK
CLOSELY FOR PROPER

cover and under governor ann.
2. Remove spring and plunger with a magnet tool.
Clean plunger and spring with a suitable solvent
and reinstall.

ElTl

FIGURE 3. CRANKCASE BREATHER

PRESSURE LUBRlCATlON

Pressure lubricated engines use

an oil pump to lubricate engine parts. If oil pressure is low, the pump

should be checked.

To remove the oil pump, it is necessary to detach the
intake cup assembly, as illustrated in Figure 4.

Redistribution or publication of this document,
by any means, is strictly prohibited.

FUEL SYSTEM
e

CARBURETOR CLEANING AND INSPECTION
To clean the carburetor, soak all components thoroughly
in a good carburetor cleaner, following the manufacturer’s instructions. B e sure to remove all carbon from
carburetor bore, especially in the area of the throttle
valve. After soaking, clean out all passages with
filtered, compressed air.

Check the adjusting needles and nozzle for damage. If
float is loaded with fuel or damaged, replace it. The
float should fit freely on its pin without binding.
Check the choke and throttle shafts for excessive side
Play and replace if necessary.
Note: Carburetor repair and gaskef kits are available
from your nearest Onan Parts Center.

CHOKE FLY
CHOKE SHAFT
AND LEVER

SLEEVE
ASSEMBLY

NOTE

FLOAT VALVE
ASSEMBLY

O N SOME MODELS ENGINES FUEL
PUMP !S MOUNTED DIRECTLY TO
CARBU R E T 0R.

FLOAT AND LEVER

MAIN ADJUSTING
NEEDLE

FLOAT LEVER
SHAFT

./.

F I G U R E 5. EXPLODED VIEW OF CARBURETOR
Redistribution or publication of this document,
by any means, is strictly prohibited.

PUMP COVER

EXPLODED VIRN.OF FUEL PUMP

FIGURE SA. EXPLODED VIEW

OF FUEL PUMP

CARBURETOR DISASSEMBLY AND REPAIR (Figure 5)
Removal:
1. Remove air cleaner and hose.
2. Disconnect governor and throttle linkage, choke
control and fuel line from carburetor.
3. Remove the four intake manifold capscrews and
lift complete manifold assembly from engine.
4. Remove carburetor from intake manifold.
IMPORTANT:
conditions.

Always work on carburetor in clean

I
I

Needle and Valve Seat:
1. Remove four screws from top of carburetor and
lift off float assembly.
2. Invert float assembly as shown in Figure 6.
3. Push out pin that holds float to cover.
4. Remove float and set aside in a clean place. Pull
out needle and spring.
5. Remove valve seat and replace with a new one,
making sure to use a new gasket.
6. Install new bowl gasket.
7. Clip new needle to float assembly with spring
clip. Install float.

Replacing

FIGURE 6. FLOAT ADJUSTMENT

’Fuel Pump Disassembly (Figure 5A):
i. Remove vacuum’-line and fuel line.
2. Remove the two fuel pump attaching screws.
3. Grasp pump and carefully pull apart. Diaphragm,
plunger, return spring, pump body and mounting
gaskets will now be loose.
4. Internal fuel pump parts are available in a repair
kit. Check Parts Catalog for correct part number.
5. Ensure that clamps are replaced on fuel line.

Carburetor Float Adiustment:
1. Invert float assembly and casting.
2. With the float resting lightly .against the needle
and seat, there should be 118 ” clearance between
the bowl cover gasket and the free end of the
float.
3. If it is necessary to reset the float level, bend
the float tangs near the pin to obtain a 1/8”
clearance (Figure 6).

m
CAUTION

,Use care when reassembling pump;
all
parts must
be perfectly
aligned,
Redistribution
or publication
of this document,
by any
means,
is strictly prohibited.
or pump will leak, creating
a fire
hazard.

ARBURETOR ADJUSTMENTS
he carburetor has a main fuel valve adjusting screw
id an idle valve adjusting screw (Figure 7). A low
x e d adjustment screw is shown in Figure 8.
:itiaI Adiustment:

1. Turn main fuel valve clockwise until it just closes.

SET LOW SPEED ADJUSTMENT

SO ENGINE RUNS A T 1200 RPM

Ez3

Do not open main fuel jet more
than 1/2 turn beyond the maximum
power point as this could cause spark plug fouling
etc.
2. Now open main fuel valve 2 turns counterclockwise.
3. Close idle valve insame manner and open it one
turn (counterclockwise).
1. This initial adjustment will permit engine to start
and warm up prior to final adjustment.
CAUTION

LOW SPEED SET
O N GOVERNOR
LINKAGE- SMALL
GAP HERE AT NO
LOAD

IN "SLOW" POSITION.

FlGURE 8. LOW SPEED ADJUSTMENT

MAIN FUEL
(HIGH SPEED)
ADJUSTMENT

GOVERNOR (Figure 9 )
These engines are adapted for use where a wide range
of speed settings is desired. Engine speed is controlled a t any given point between minimum and
maximum by simply shifting the throttle lever on the
dash panel until the desired speed is reached.
The design of the variable speed governor gives an
automatic decrease in sensitivity when the speed is
increased and the result is good stability at all speeds.

IDLE
THRO~TLE
ADJUSTMENT
STOP

SCREW
SIDE VIEW

A reliable instrument for checking engine speed is
required for accurate governor adjustment. Engine
speed can be checked with a tachometer.

REAR VIEW

FIGURE 7. MAIN FUEL AND IDLE VALVE ADJUSTMENT

Check the governor arm, linkage, throttle shaft, and
lever for binding condition or excessive slack and
wear a t connecting points. A binding condition a t
any point will cause the governor to act slowly and
regulation will b e poor. Excessive looseness can
cause a hunting condition and regulation will be
erratic. Work the arm back and forth several times
by hand while the engine is idling to check for above
conditions.

?no1 Adiustment:

. Turn main fuel valve in until engine misses (lean
mixture), then turn it out past the point where
engine runs smoothly until engine runs unevenly
(rich 'mixture). Turn valve t o mid-point between
lean and rich s o engine runs smoothly.
. Hold engine at idle position and s e t low speed
adjustment screw (Figure 8 ) until a fast idle is
obtained (1200 rpm).
. Hold throttle in idle position and turn idle adjustment valve in (lean) and out (rich) until engine
idles smoothly.
. Reset low speed adjustment screw so engine
idles at 1200 rpm.
Release throttle engine should accelerate without
hesitation. If engine does not accelerate properly,
readjust main fuel valve by turning out slightly.
Important: Do not open more than 1/2 turn beyond
maximum power point.

If governor is hunting or not operating properly, adjust
as follows and as shown in Figure 9.
1. Disconnect linkage (A) from one of holes (C).
2. Push linkage (A) and governor arm (B) as far back
(toward carburetor) as they will go.
3. Holding linkage and governor arm toward direction
of Carburetor, insert end of linkage into whichever
hole (C) (in governor arm) lines up the closest.

The governor control spring is factory set in the top

or second hole of the governor arm (farthest from pivot).
To increase the sensitivity, move the spring loop into
the hole nearest the pivot point or shaft. To decrease
the secsitivity, move the spring outward. After the
sensitivity has been set, adjust the low speed with
the adjustment screw
on theorcontrol
wire
bracket.
Redistribution
publication
of this
document,
by any means, is strictly prohibited.

AIR CLEANER
-If

air cleaner becomes too dirty,
engine will not receive sufficient
air to run properly. Symptoms: Loss of power, flooding,
hard to start and overheating.

Engine is equipped with a paper element. If the engine
is equipped with polyurethane precleaner, it must be
removed, cleaned and oiled every 25 hours of operation,
or more under extremely dusty conditions.

THROTTLE PLATE

@ GOVERNOR

1. To clean precleaner wash in water and detergent
referring to Figure 10. Remove excess water by

CONT

squeezing like a sponge and allow to dry thoroughly. Distribute three tablespoons of SAE 30 engine
oil evenly around the precleaner. Knead into and
wring excess oil from precleaner.
2. Depending on conditions in which the tractor is
operating, the inner paper element should be replaced whenever i t becomes excessively dirty or
oily.
Never run the engine with the air
cleaner removed. Dirt will enter
the engine and. wear out the rings causing excessive blow-by.
GOVERNOR

FIGURE 9. GOVERNOR ADJUSTMENTS

1. W A S H
2. SQUEEZE DRY
3. COAT W I T H OIL
4. I N S T A L L OVER PAPER ELEMENT

OLYURETHANE:
PRE CLEANER .

BREATHER HOSE
INTAKE T U B E

FIGURE

IO. AIR CLEANER ASSEMBLY
Redistribution or publication of this document,
by any means, is strictly prohibited.

IGNITION AND BATTERY CHARGING

BREAKER POINTS
To maintain maximum efficiency from the engine,
change the breaker points every 200 hours of operation.
Proceed as follows when engine is cold: .
1. Remove the two screws and the cover on the
breaker box.
2. Remove the two spark plugs s o engine can be
easily rotated by hand. Check condition of spark
plugs at this time.
3. Refer to Figure 11. Remove mounting nut (A) and
pull the points out of the box just far enough s o
screw (B) can be removed and leads disconnected.
4. Remove screw (C) and replace condenser with a
new one.
5. Replace points with a new s e t but do not completely tighten mounting nut (A).
6. Remove the air intake hose that connects to blower
housing. This provides an access to view timing
mark.
7. Rotate the engine clockwise (facing flywheel) by
hand until the 25' BTC mark on geer cover aligns
with mark on flywheel. Turn another 1/4 turn
(90' ) to ensure points are fully open.
'

8. Using a screwdriver inserted in notch @) on the
right side of points, turn points until gap measures
-023to .025"with a flat thickness gauge. (Be sure
feeler is clean.) Tighten mounting nut and recheck
gap9. Check ignition time as soon as possible using
continuity test lamp.

'52

.--

---.-.--

BTC

- --

FIGURE I I. IGNITION AND TIMING ADJUSTMENT

Turn crankshaft against rotation (counterclockwise) until the points close. Then slowly turn the
crankshaft with rotation (clockwise).
3. The lamp should go out just as the points break
which is the time at which ignition occurs (25'
A

IGNITION TIMING
The timing on the engine is preset at the factory. A
non-movable breaker point box is used, however a
slight timing change could be made by adjusting points.

BTC).

The engine is equipped with an automotive type battery
ignition system. Both spark plugs fire simultaneously,
thus the need for a distributor is eliminated. Spark
advance is set at 25' BTC (before top center) and
should be maintained for best engine performance.
Always check timing after replacing ignition points or
if noticing poor engine performance.
Proceed as
follows :

Timing Procedure

ond Hot:
1. T o accurately check the ignition timing, use a
timing light when engine is running. Connect the
timing light according to its manufacturer's instructions. Either spark plug can be used a s they
fire simultaneously.
2. Remove the air intake hose that connects to blower
housing to provide a n access to view timing marks.

Timing Procedure (Preferred Method) - Engine Not
Running and Cold:
1. Connect a continuity test lamp set across the
ignition breaker points. Touch one test prod to the

Engine Running

n
WARN,NG

Be sure tractor is in the neutrd
position before sfarfing engine.

3. Start the engine. When engine warms up check the
ignition timing. The mark on the flywheel should
line up with the 2 5 O mark on the cover. .
4. Replace hose, breaker box cover and any other
Redistribution
or publication of this document,
hardware removed
from engine.

breaker box terminal to which the coil lead is
connected and touch the other test prod t o a good
ground on the engine.

by any means, is strictly prohibited.

This engine uses a I2 volf, negative
-USED

PART

DESCRIPTION

14 'GASKl3,CARBURETOR BODY
1
BeginSpecF
142-0572
1
SpecAthrough -E
142-0543
15 142-0555
1
'Diaphragm, Fuel Pump
1
Spring, Throttle Stop
?6 142-0544
17 142-0282
1
+Spring. ldle Needle
1 tspring, Fuel Pump
18 142-0545
Fly, Choke
19 142-0546
1
20 142-0547
I
FloatAssembly
1
tSha& Float
21 142-0548
22 142-0016
1
?Needle. Idle
23 142-0549
1
Need1e.Power
24 142-0550
1
'O-Ring. Packing Power Needle
25 142-0351
1
cover,Pump
26 142-0552
1 ?Plate, Drive Fuel Pump
1 $Valve Assembly. Float
27 142-0553
28 142-0554
1
Clip, Retaining Float Vaive
29 1424523
1
'Gaska Float Valve Seat

142-0557
1
Spec A through E
tKIT.GASKEF llncludesPartsMarked')
Begin Spec F.
.142-0571
1
Spec A through E
142-0556
1
Body. Lower (Not Sold
1
1
Separately)
2 80DY.UPPER
Begin Spec F
142-0573
1
Spec A through E
142.O533
1
3 142-0534
1 tshaft. Throttle
'@Ring. Packing Throttle Shaft
4 142-0535
1
Shaft, Choke
5 142-0536
1
*Valve Assembly. Reed Fuel
6 142-0537
1
PUmp(ldUdeSPiNtSMarked#)
7 FLY.THROITLE
Begin S p e c F
142-0584
1
SpecAthroughE
14Z-0538
1
Screw. Throttle stop
a 142-0064
1
9 142-0334
4 tsaew.Fly to shaft
10 142-0539
4
screrv.u~toLowerBody
Swew. Pump Cover to Body
11 142-0540
2
12 142-0541
1 'Gasket Pumpcwer
13 142-0542
1 'Gaset Inlet pbte

30 149-1321

s[Kwxu)l

#cap,Fueloutlet
#clamp, ftose (7/16")

t - IndudedmRepairKit

*.- IndudedinGasketKit

Redistribution or publication of this document,
9650250 (AUGUST lsn)
by any means, is strictly prohibited.

Redistribution or publication of this document,
by any means, is strictly prohibited.

Onan Corporation
1400 73rd Avenue N. E.
Minneapolis, MN 55432
612-574-5000
Telex: 275477
Fax: 612-574-8087
Onan is a registered trademark 6f Onan Corporation

Redistribution or publication of this document,
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Modify Date                     : 2003:03:17 16:59:47-06:00
Create Date                     : 2003:02:20 10:50:32-06:00
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Producer                        : Adobe PDF Library 4.0
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965 0250 Onan BF (spec A F) Engine Service & Parts Manual (12 1987)

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