Figure 4-5. Outboard View of port propulsion unit.

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Figure 4-4. Inboard view of port propulsion unit.

TM-55-1905-217-12 Landing Craft Mechanized; Steel; DED; Overait Length 74 Feet Mod 1 Marl VIII Navy Design LCM-8 Hull Numbers 8500 and 8580 thru 8618 Manual

Figure 4-7. Crankshaft rotation and accessory arrangement as viewed from flywheel end.

TM 55-1905-217-12

Figure 4-5. Outboard View of port propulsion unit.

arm (fig. 4-9). Adjust the push rod to obtain a smooth

4-21. Exhaust Valve Clearance Adjustment

"pull" on the feeler gage.

a. General. The correct exhaust valve clearance at

(5) Remove the feeler gage. Hold the push rod

normal engine operating temperature is important for

with 5/16-inch wrench and tighten the locknut with a 1/2-

smooth, efficient operation of the engine. Whenever the

inch wrench.

cylinder head is overhauled, the exhaust valves are

(6) Recheck the clearance. At this time, if the

reconditioned or replaced, or the valve operating

adjustment is correct, the 0.011 inch feeler gage, J9708,

mechanism is replaced or disturbed in any way, the valve

will pass freely between the valve stem and the rocker

clearance must first be adjusted to the cold setting to

arm, but the 0.013 inch feeler gage will not pass through.

allow for normal expansion of the engine parts during the

(7) Check and adjust the remaining valves in

engine warm-up period. This will insure a valve setting

the same manner as outlined above.

that is close enough to the specified clearance to prevent

c. Exhaust Valve Clearance Adjustment (Hot

damage to the valves when the engine is started.

Engine).

b. Exhaust Valve Clearance Adjustment (Cold

(1) Maintaining the normal engine operating

Engine).

temperature -is particularly important when making the

(1) Place the governor throttle control lever in

final valve clearance adjustment. If the engine is allowed

the NO-FUEL position. Pull engine stop control out.

to cool off before setting any of the valves, the clearance

(2) Rotate the crankshaft until the injector

when running at full load may become insufficient.

follower is fully depressed on the cylinder to be adjusted.

(2) With the engine at normal operating

(3) Loosen the push rod locknut.

temperature (160-185 F.), recheck the exhaust valve

(4) Place a 0.013 inch feeler gage, tool J9708,

clearance with feeler gage J9708. At this time, if the

between the valve stem and the rocker

valve clearance is correct, the 0.008-inch feeler gage will

pass freely between

4-15