Cylinder Head - TM-10-3930-634-340079

TM 10-3930-634-34

(1) Inspect manifold for cracks or other defects.

b. Removal.

Replace the part if threads are damaged.

(1) Remove exhaust piping and muffler (TM

(2) Inspect studs and nuts for damaged threads.

10-3930-634-12).

Replace the part if threads are damaged.

(2) Remove the exhaust manifold in numerical se-

e. Installation.

quence as shown in figure 3-67.

(1) Install the exhaust manifold with a new gasket

c. Cleaning.

in reverse of numerical sequence as shown in figure

(1) Clean all rust, carbon and oxidized material

3-67.

from the manifold with a wire brush.

( 2 ) Install muffler and exhaust piping (TM

(2) Clean gasket material from exhaust manifold

10-3930-634-12).

and cylinder head.

d. Inspection.

3-25. Cylinder Head

a. General.

The cylinder head is a one piece casting mounted to the

cylinder block. It may be removed from the engine as

an assembly containing cam followers, cam follower

guides, rocker arms, exhaust valves, and fuel injectors.

To insure efficient cooling, the exhaust passages, valve

inserts and fuel injectors are completely surrounded

with coolant. Water nozzles are inst ailed between each

pair of cylinders in the water inlet ports where coolant

is directed at high velocity against the sections of the

cylinder head subjected to the greatest heat. Gaskets

and seal rings are incorporated to seal the head to the

cylinder block.

b. Removal.

(1) Drain cooling system and engine block (TM

10-3930-634-12).

(2) Remove thermostat, thermostat housing (TM

10-3930-634-12).

(3) Remove exhaust manifold (para 3-24).

(4) Remove rocker arm cover (para 3-16).

CAUTION

When resting cylinder head assembly on

work bench, protect cam follower rollers and

injector spray tips by resting valve side of

head on wooden blocks at least 2 inches thick.

3-51