Figure 3-38. Camshaft bearing installation.

mount is located in the lower portion of the timing gear

cover casting.

a. Removal and Installation of Timing Gear Cover.

NOTE

The following procedures apply to

removal of cover with engine

mounted in truck. if engine is out of

truck, disregard (1) and (5) below.

(1) Remove radiator (TM 10-3930-618-201.

(2) Remove cooling fan (TM 10-3930-618-20).

(3) Remove crankshaft pulley (para 3-21).

(4) Remove governor (para 3-9).

(5) Remove support capscrews (9, fig. 3-40)

Figure 3-38. Camshaft bearing installation.

and raise rear end of engine approximately 2.0 inches,

and block the engine in this position. This takes weight

of engine off mounting pad on timing gear cover.

(6) Remove capscrews (18, 20, and 22) nuts

(1) and lockwashers (17, 19, and 21) attaching timing

gear cover (4) to front plate (6) and oil pan.

Do not attempt to pry cover off. Tap cover lightly with

wood or plastic mallet to remove.

(7) To install, reverse removal instructions

above.

b. Inspection and Repair.

(1) Inspect timing gear cover for cracks,

dents, breaks, or other damage which could prevent a

secure seal of the timing gear cover.

(2) Replace gaskets.

(3) Replace defective parts.

Figure 3-39. Checking camshaft thrust clearance.

c. Timing Gears.

3-25. Timing Gears and Cover

crankshaft and camshaft timing gears.

(2) Refer to paragraph 3-9 for governor timing

The timing gear housing at the rear end of the engine

gear.

contains a train of three helical gears; a crankshaft gear

(3) Check backlash of timing gears with a dial

which is pressed and keyed on the crankshaft, a

indicator. One or more of the mating gears should be

camshaft gear, and a governor gear driven by the

replaced if backlash exceeds 0.007 inch.

camshaft gear. Gear train is splash lubricated by excess

oil from engine oil system relief valve. The rear engine

3-50