CRANKSHAFT INSTALLATION

TM 10-3930-644-14&P

Be sure that the bearings seat on absolutely clean

GEAR TRAIN for timing mark alignment. Use a

surfaces and that the back of each bearing is wiped

driving sleeve to tap gear snugly into place.

perfectly clean. The slightest bit of dirt or carbon

Hard driving is not necessary and indicates the

squeezed between the back of a bearing and its seat

gear is cocked on the shaft.

can cause rapid bearing failure by developing a

Install timing gear cover; inspect seal and

localized high spot.

replace if necessary. Gasket between R-104-1

cover and engine block should always be

Equally important in obtaining maximum bearing life

replaced.

is the correct tension on the bearing cap nuts. Pull

Loosely bolt timing gear cover to engine block.

down on all nuts evenly, going from one side of the

Install pump sleeve and pump gear (Figure 6-2).

bearing to the other. Apply final tension with a torque

Refer to TOPIC 18 or 19 and install governor.

wrench using a slow steady pull and holding the

Install fan drive shaft and gear, drive adapter

wrench "on torque" for a few seconds when the

and pulley on gear cover. Tighten cover bolts.

proper value is reached.

Replace front and rear filler blocks. Refer to

TOPIC 14. FILLER BLOCKS AND OIL GUARD.

Main bearings should be torqued to 85-95 lb. ft, and

10.

Replace oil pan and change gaskets. Secure oil

connecting rod bearings should be torqued to 40-45

lb. ft.

pan capscrews.

11.

Replace flywheel housing and secure bolts.

It is preferable to go to a slightly higher tension if

12.

Replace flywheel, ensuring the same bolts

necessary. If it is apparent that the cotter pin cannot

removed are re-installed. Torque bolts to 35-40

be installed without bringing the tension dangerously

lb. ft.

near the limit of the bolt, remove the nut and try again

13.

Rotate engine to upright position and re-install

with another nut at the same location. Previous over-

transmission.

torquing, or some other damage to the bolt or nut is

14.

Install engine/transmission and secure engine to

sometimes encountered and will be felt by the torque

motor mounts 15.

Reconnect transmission

"softening up" so that the nut can be turned without

linkage oil line and drive shaft.

any appreciable increase in wrench tension. Never

16.

Connect engine oil filter lines.

allow a bolt or a nut in this condition to remain in the

engine.

17.

Install intake/exhaust manifold, use new gasket.

18.

Reconnect governor rod assembly, carburetor

E. CRANKSHAFT INSTALLATION

linkage, fuel line and air hose 19. Install starter

motor.

1. Carefully install oil guard in crankcase, and

20.

Connect wires to temperature and oil pressure

install crankshaft in bearing mountings; secure

senders and neutral start switch.

main bearing caps and cap bolts. Torque to 85-

21.

Remove covering from spark plug ports, and

95 lb. ft. Refer to preceding paragraph D.

after verifying proper spark gap reinstall spark

BEARING INSPECTION AND INSTALLATION

plugs.

in this section.

22.

Replace distributor, and spark plug ignition

2. Install connecting rod bearing caps and cap

wiring. Hook up spark plug wiring to respective

nuts. Torque to 40-45 lb. ft.

plugs.

3. Install oil pump. Refer to TOPIC 12. OIL

23.

Replace alternator.

PUMP.

24.

Install water pump.

4. Install key and crankshaft gear. Install pump

coupling (Figure 6-2) on crankshaft. Tighten

capscrew to 140-150 lb. ft. Refer to TOPIC 10,

R-104-1

3-21