Compression

TM 9-2320-312-24-2

Testing and Adjusting Section

Table 13

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Compression - Test

Inlet Valves

Exhaust Valves

Valve Lash

0.38 0.08 mm

0.64 0.08 mm

SMCS Code: 1215

Check

(0.0150 0.0031

(0.0252 0.0031

(Stopped

inch)

Engine)

An engine that runs roughly can have a leak at the

valves. An engine that runs roughly can also have

valves that need an adjustment. Remove the head

1-2-4

1-3-5

Compression

and inspect the valves and valve seats. This is

Stroke

necessary to find those small defects that would

not normally cause problems. Repairs of these

TC Exhaust

3-5-6

2-4-6

problems are normally performed when you are

Stroke(1)

reconditioning the engine.

1-5-3-6-2-4(2)

Firing Order

(1)

360 from TC compression stroke

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(2)

The No. 1 cylinder is at the front of the engine.

Engine Valve Lash -

If the measurement is not within this range

Inspect/Adjust

adjustment is necessary. See Testing And Adjusting,

"Valve Lash And Valve Bridge Adjustment".

SMCS Code: 1102-025

To prevent possible injury, do not use the starter

to turn the flywheel.

Hot engine components can cause burns. Allow

additional time for the engine to cool before mea-

suring valve clearance.

This engine uses high voltage to control the fuel

g00290846

injectors.

Illustration 63

Cylinder and Valve Location

Disconnect electronic fuel injector enable circuit

(A) Exhaust valve

connector to prevent personal injury.

(B) Inlet valves

Do not come in contact with the fuel injector ter-

minals while the engine is running.

Note: Valve lash is measured between the rocker

arm and the bridge for the inlet valves. Valve lash

is measured between the rocker arm and the valve

stem for the exhaust valve. All of the clearance

measurements and the adjustments must be made

with the engine stopped. The valves must be FULLY

CLOSED.

Valve Lash Check

An adjustment is NOT NECESSARY if the

measurement of the valve lash is in the acceptable

range. Adjust the valve lash while the engine is

stopped. The range is specified in Table 13.