Section XII. CAMSHAFT

TM 10-3930-632-34

Figure 9-29. Checking Bearing Clearance with Shim

Figure 9-28. Checking Bearing Clearance with

Stock.

Plastigage.

(3) Install the cap on the block; secure with the

Clearance must be between 0.0006 and

screws and lockwashers. Tighten the screws to 85 to 95

0.0032 inch. If the clearance is not within these limits,

ft/lbs torque.

replace the bearings and recheck the clearance.

(4) Try to turn the crankshaft by hand. If the

Remove and replace the bearings as follows:

crankshaft will not turn or a definite drag is felt, bearing-

(1) Remove the bearing cap; remove the bearing

to-bearing journal clearance is within tolerance. Remove

from the cap.

the shim stock and reinstall the bearing caps.

(2) Install a pin with an angular head in the oil hole

After all main bearings have been installed,

in the crankshaft bearing journal (fig. 9-27).

check crankshaft end play using a dial indicator. If end

(3) Rotate the crankshaft by hand. The pin will

play is not between 0.002 and 0.006 inch, replace the

force the top bearing half out of its seat.

thrust plate (9, fig. 9-20) as follows:

(4) Position the replacement bearing on the

(1) Pull the gear (6) from the crankshaft. Remove

crankshaft bearing journal. Rotate the crankshaft by

the thrust plate (9).

hand. The pin will force the bearing half into position.

(2) Position a new thrust plate and one key (7) on

(5) Install the replacement bearing half in the cap.

the crankshaft; drive the gear onto the shaft.

Install the cap.

(3) Press the gear into final position by installing

Check the remaining bearing-to-bearing

the oil slinger (5), pulley (4), washer (2) and bolt (1).

journal clearances and replace bearings as necessary.

(4) Remove the nut, washer, pulley, and slinger

An alternate method of checking bearing

after the gear is fully seated.

clearance is as follows:

Install the pistons and connecting rods (para 9-

(1) Oil the bearing and bearing journal with engine

29).

oil.

Install the flywheel housing and flywheel (para

(2) Position a strip of 0.003-inch feeler gage, 1/2

9-25).

inch long, on the bearing cap (fig. 9-29).

Install the gear cover (para 9-21).

Install the oil pan and oil pump (para 9-17).

Install the cylinder head (para 9-9).

Section XII. CAMSHAFT

which is installed on the crankshaft and the other on the

9-34.

General

camshaft. The camshaft gear has

The camshaft is driven by the timing gears, one of

Change 1 9-23