Camshaft Bushings

TM 10-3930-644-14&P

To ensure satisfactory alignment, the reaming

2. Camshaft Bushings

should be done with a piloted tool which

maintains the same center through the

Camshaft bushings are a thin wall, steel back,

crankcase.

babbit lined type with a split line which must

close together when the bushing is pressed in

C. INSTALLATION

the crankcase.

For proper installation it is

necessary to have suitable driving tools with an

Carefully slide camshaft into block, making sure that

arbor and shoulder of the correct diameter to

cam gear is in correct timing with crank gear. Replace

drive the bushing into place true and straight

valve tappets in their respective locations.

Ensure

without battering or buckling. The press fit is

camshaft is properly supported by cam bearings and

approximately .005". It should be noted that a

secure with thrust plate and capscrews. Tighten to

chamfer is provided on one edge of the bushing

recommended torque.

to aid in starting the installation. It is very

important to locate the bushing in the case so

Refer to TOPIC 18 or TOPIC 19 and install the governor

the oil passage holes align with the holes in the

and timing gear cover.

crankcase.

Replace side cover plate and secure. Install oil pump,

distributor drive, oil pan and oil pan capscrews. (Refer

The bushings must be finish reamed after

to respective installation sections if necessary.)

Installation to provide finished inside diameters

as follows:

Replace manifold and carburetor, if removed. (Refer to

TOPIC 3. MANIFOLD.)

Front:

1.8745" to 1.8755"

See ENGINE REMOVAL AND INSTALLATION for

Center:

1.7495" to 1.7502"

installation instruction.)

Rear:

1.2495" to 1.2505"

R-104-1

3-34