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TM 9-4910-582-14&P

TECHNICAL MANUAL

OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT,

AND GENERAL SUPPORT MAINTENANCE

MANUAL INCLUDING REPAIR PARTS LIST

FOR

TESTER, CYLINDER

MODEL 2093A

(STEWART-THOMAS INDUSTRIES INC.)

(NSN 4910-00-250-2423)

HEADQUARTERS,DEPARTMENT OF THE ARMY

SEPTEMBER 1980

TM 9-4910-582-14&P

TECHNICAL MANUAL

No. 9-4910-582-14&P

HEADQUARTERS

DEPARTMENT OF THE ARMY

WASHINGTON, DC, 26 September 1980

OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT,

AND GENERAL SUPPORT MAINTENANCE MANUAL

INCLUDING REPAIR PARTS LIST

FOR

TESTER, CYLINDER

MODEL 2093A

(NSN 4910-00-250-2423)

NOTE

This manual is published for the purpose of identifying an authorized commercial

manual for the use of the personnel to whom this cylinder tester is issued.

Manufactured by: Stewart-Thomas Industries, Inc.

100 Cabot Street

West Babylon, NY 11704

Procured under Contract No. DAAK09-78-C-4437

i

TM 9-4910-582-14&P

INSTRUCTIONS FOR REQUISITIONING PARTS

NOT IDENTIFIED BY NSN

When requisitioning parts not identified by National Stock Number, it is

mandatory that the following information be furnished the supply officer.

1-

2-

3-

4-

5-

6-

7-

Manufacturer’s Federal Supply Code Number-

31077

Manufacturer’s Part Number exactly as listed herein.

Nomenclature exactly as listed herein, including dimensions, if

necessary.

Manufacturer’s Model Number - Model 2093A

Manufacturer’s Serial Number (End Item)

Any other information such as Type, Frame Number, and Electrical

Characteristics, if applicable.

If DD Form 1348 is used, fill in all blocks except 4, 5, 6, and

Remarks field in accordance with AR 725-50.

Complete Form as Follows:

(a) In blocks 4, 5, 6, list manufacturer’s Federal Supply Code

Number - 31077

followed by a colon and manufacturer’s

Part Number for the repair part.

(b) Complete Remarks field as follows:

Noun:

(nomenclature of repair part)

For: NSN:

4910-00-250-2423

Manufacturer:

Stewart-Thomas Industries, Inc.

Model: 2093A

Serial: (of end item)

Any other pertinent information such as Frame Number,

Type, Dimensions, etc.

The Model

pressure. A valve,

release the air

TM 9-4910-582-14&P

OPERATING INSTRUCTIONS

MODEL 2093A

COMPRESSION TESTER

2093A tester is equipped with a dial calibrated from 0 to 300 lbs.

located in the bottom of the check valve fitting, is provided to

pressure in the gauge.

A set of adapters, Figure 1,with threads to match the spark plugs of

various engines is provided.A flexible extension is also furnished for use in

restricted places.The cone adapter fitting is used for quick succession

cylinder tests.

COMPRESSION TEST.The engine oil level, grade and cleanliness should be

noted before making this test.When removing spark plugs for a compression

test, first loosen the plugs slightly and then with an air hose blow out all the

accumulation of dirt and foreign substances, which usually become pocketed

around the spark plug. This will prevent a particle of foreign matter from

dropping into the combustion chamber and becoming lodged under a valve. A valve

thus held open will cause an erroneous compression reading of the cylinder. After

the plugs are removed, it is a good plan to apply the air hose for blowing out the

combustion chambers.

Observe the spark plugs as they are removed for evidence of

fouling, burning, heat range, etc.

The engine should be up to normal operating temperature before starting

this test to assure normal oil and metal expnsion conditions.

Crank the engine with the starting motor with the ignition OFF. In case

of ignition switch-operated starting motor, ground ignition coil high-tension wire

and use the ignition switch.

When making a compression test of an engine, the operator should take

care to see that the highest gauge reading is obtained for each cylinder with

the same number of turns of the starting motor. Usually about eight turns

(which easily can be counted) of the motor is sufficient for each cylinder.

(1)

During this process if the operator

sticking valve easily may be detected.

TM 9-4910-582-14&P

carefully watches the gauge hand, a

The hand progressively rises with

each revolution of the starting motor until no further rise is obtained.The

indicated pressure on the gauge represents the maximum compression

pressure under the prevailing conditions.

Should the hand remain fixed at any one of the “beats” or revolutions of

the starting motor and then again rise, the point where it lagged indicates a

valve sticking in the open position. Compression pressures will be found to

be higher in modern engines than for older models.

With the pistons, rings, valves and gaskets in good condition, maximum

readings on all cylinders should be uniform within plus or minus 5 lbs. of

specified pressures.

The maximum overall readings will vary slightly according to the altitude, but

are influenced considerably by overall engine

speed, valve settings, etc.

Low readings on adjacent cylinders will

between cylinders.

temperatures, oil viscosity, cranking

ordinarily indicate gasket leakage

Low cylinder indication -particularly in one cylinder - indicates either

improper valve seating or piston and ring blow-by.

In order to re-check, heavy sealing oil may be squirted onto the heads of

all of the pistons and a re-check similar to the first test carried out.

PREVENTIVE MAINTENANCE. All parts of the equipment should be wiped

clean and dried after use and retained in the carrying case to prevent damage.

TROUBLESHOOTING. Should a pressure drop occur when reading the pressure gage,

pressurize the unit with compressed air; Caution: Do not exceed 300 psi. Submerge

unit in water up to the stem of the Pressure Gage. DO not submerge Pressure Gage.

Bubbles will appear at the leak. Tighten as is necessary and repeat test with unit

pressurized.

(2)

TM 9-4910-582-14&P

-3-

TM 9-4910-582-14&P

PARTS LIST FOR MODEL 2093A

COMPRESSION TESTER

FIGURE 1

PART

NUMBERDESCRIPTION

2065

2066

2067

2068

2069

2070

2071

2082

2088

2089

2090

2091

2092

2102

NUMBER

REQUIRED

Compression Gauge 0-300 lbs.

Cone Type Rubber Adapter

Spark Plug Adapter 10MM

Spark Plug Adapter 14MM

Spark Plug Adapter 18MM

Spark Plug Adapter 7/8 in.

Check Valve Fitting

Carrying Case (not shown)

3" Universal Adapter with Rubber COne

135° Universal Adapter with Rubber Cone

6-1/4" Universal Adapter with Rubber Cone

O Ring

Flexible Compression Hose Adapter

Relief Valve

1

2

1

1

1

1

1

1

1

1

1

2

1

1

-4-

By Order of the Secretary of the Army:

Official:

J. C. PENNINGTON

Major General,

United States

The Adjutant General

E. C. MEYER

General, United States Army

Chief of Staff

Army

✰ U. S. GOVERNMENT PRINTING OFFICE: 1982 O -388-969

TM 9-4910-582-14&P