The specified clearance is 0.003-0.008 inch.

crankshaft. Make sure the gear timing mark is

(3) Remove the governor. Refer to paragraph

aligned with the camshaft gear timing mark. It may

3-3.

be necessary to tap the gear with a wood block and

(4) Remove the front support capscrews and

a hammer to seat it against the crankshaft shoulder.

raise the front end of the engine approximately 2

(c) Allow the gear to cool gradually; do not

inches. Block the engine in this position.

immerse in water or oil.

(5) Remove the capscrews, lockwashers, stud

(3) Install the fuel pump. Refer to TM 10-

nut, and lockwasher attaching the timing gear

3930-624-12. Install the governor assembly. Refer

cover to the front plate and oil pan.

to paragraph 3-3.

(6) Tap the cover lightly to remove the cover.

(4) Check the backlash of the gears with a dial

Do not attempt to pry the cover off.

indicator. Refer to figure 3-10. One or more of the

(7) Remove the retaining clip and remove the

mating gears should be replaced if the backlash

camshaft gear. Refer to paragraph 3-1.5.

exceeds 0.008 inch.

(8) Remove the fuel pump from the side of the

engine. Refer to TM 10-3930-624-12. Place a bar

through the opening against the side of the cam to

hold the camshaft in a forward positinn.

(9) Use a gear puller to remove the crankshaft

gear from the crankshaft. Refer to paragraph 3-17.

(10) Remove the governor drive gear. Refer to

paragraph 3-3.

b. Cleaning and Inspection.

(1) Clean the timing gear cover. timing gears,

and mounting hardware with a cleaning solvent.

(2) Inspect the timing gear cover for dents,

cracks, corrosion.

(3) Inspect the gears for nicked, scored, or

broken teeth. Replace any worn or damaged parts.

Refer to paragraph 3-15 for camshaft gear in-

spection and paragraph 3-17 for crankshaft gear

inspection.

c. Installation.

(1) Use the following procedure to install the

camshaft gear:

(a) Line up the camshaft gear on the key.

Drive the gear onto the camshaft using a block of

Figure 3-10. Checking gear backlash.

hardwood and a hammer. Drive the gear on far

enough so the thrust plate rests against the cam-

(5) Install a new gasket and install the timing

shaft journal.

gear cover.

(b) Check the clearance between the thrust

(6) Install the crankshaft pulley and

plate and the bearing journal. Refer to paragraph

hydraulic pump (para 5-5).

3-15. The specified clearance is 0.003-0.008 inch.

(c) Install the retaining clip.

3-14. Flywheel Assembly

(d) Remove the bar which was used to hold

a. Removal and Disassembly.

the camshaft in position.

(1) Remove the transmission. R e f e r t o

(2) Use the following procedure to install the

paragraph 2-8.

crankshaft gear:

(2) Remove two capscrews (1, fig. 3-11) and

(a) Install the key in p o s i t i o n o n t h e

lockwashers (2) which are horizontally opposite

crankshaft.

and install two guide studs. Attach a sling to the

(b) Heat the crankshaft gear in boiling oil

flywheel (3) and remove the remaining capscrews

for approximately 15 minutes. Pick up the gear

(1). Slide the flywheel off the guide studs.

with a tongs or pliers and slide the gear onto the

3-13