Gear Cover and Fan Drive, Reassembly and Installation

TM 10-3930-630-34

11-23. Gear Cover and Fan Drive, Reassembly and

NOTE

Installation

Make sure the marked teeth on the

camshaft gear straddle the marked

a. Reassembly. Reassemble the gear cover and

tooth on the crankshaft gear (fig. 11-

fan drive in reverse order of numerical sequence as

26).

illustrated in figure 11-25.

Figure 11-26. Gear train and timing works.

b. Installation.

11-25. Camshaft, Cleaning, Inspection and Repair

(1) The gear cover and fan drive is installed

a. Clean all metal parts in cleaning solvent (Fed.

during the reassembly procedure.

Spec. P-D-680) and dry thoroughly.

(2) Refer to paragraph 2-14 and install the

b. Inspect camshaft for damage and wear to lobes

hydraulic pump.

and bearing journals.

(3) Refer to TM 10-3930-630-12 and install

c. Check oil pump gear teeth on camshaft for wear

belts, fan and radiator on engine.

and damage.

d. Check camshaft as follows:

11-24. Camshaft, Removal and Disassembly

(1) Measure front bearing journal diameter.

a. Removal.

Diameter must be 1.8725 to 1.8715 inches (47.7 to

(1) Correct timing is critical to proper engine

47.53 mm). Minimum wear diameter is 1.8705 inches

operation. It is accomplished by meshing the camshaft

(47.51 mm).

drive gear with crankshaft gear timing marks as shown

(2) Center bearing journal diameter should be

in figure 11-26.

1.7465 to 1.7455 inches (44.36 to 44.33 mm). Minimum

(2) Refer to paragraph 11-21 and remove the

wear diameter is 1.7444 inches (44.30 mm).

gear cover and fan drive.

(3) Rear bearing journal diameter should be

(3) The camshaft is removed in the

1.2475 to 1.2465 inches (31.68 to 31.66 mm). Minimum

disassembly procedure.

wear diameter is 1.7444 inches (44.30 mm).

b. Disassembly. Disassemble the camshaft in

numerical sequence as illustrated in figure 11-27.

11-19