Camshaft, Reassembly and Installation

TM 10-3930-630-34

11-26. Camshaft, Reassembly and Installation

a. Carefully slide camshaft (7, fig. 11-27) into

block and bearings.

b. Install thrust plate (6) and secure with screws (4)

and lock washers (5).

c. Install camshaft gear (2) and key (3) on shaft

(7). Secure gear with nut (1). Tighten nut to a torque of

175 to 180 foot pounds (24.1 to 24.8 cm/kg).

d. Make sure the marked teeth on the camshaft

gear straddle the marked tooth on the crankshaft gear

e. To make sure there is enough clearance, hold

finger at junction of the two gears and tap the rim of the

camshaft gear with a light hammer (fig. 11-28) and

check for vibration. Check fit of teeth with an 0.0015

inch (0.038 mm) feeler gage between teeth.

(1) If vibration is felt and feeler gage will not fit

between gears, the gear fit is within expectations.

(2) Install a dial indicator as shown on figure

11-29 and check camshaft end play. End play must be

0.009 to 0.005 inch (0.228 to 0.127 mm).

Figure 11-29. Checking camshaft end play.

f. Check camshaft end play. End play must be

0.009 to 0.005 inch (0.228 to 0.127 mm).

(1) Check camshaft thrust clearance as shown

(2) If camshaft end play does not conform to

tolerances stated above, it may be corrected by

Figure 11-30. Checking camshaft thrust clearance.

installing a new thrust plate. If this does not correct the

condition, it may be necessary to machine a small

amount off from the shoulder of the thrust plate that

engages the rear face of the gear.

Figure 11-28. Checking camshaft gear fit.

g. Refer to paragraph 11-23 and install the gears

and gear cover.

11-21