Figure 3-11. Timing gear cover, exploded view.

TM 10-3930-621-34

b. Crankshaft, Camshaft and Governor Gears.

3-39. Installation

(1) Remove camshaft retaining ring (17, fig. 3-6)

a. Crankshaft, Camshaft and Governor Gears.

and, using a suitable gear puller, remove camshaft gear

(1) Install governor gear (para 4-19).

(16).

(2) Heat carp and crankshaft gears to

(2) Remove front deflector (1;, fig. 3-3) with

approximately 4500 F. in an oil bath. Use a driving

attaching drive screws (13).

sleeve to tap gear snuggly in place. Hard driving is not

(3) Using a suitable gear puller remove

normally necessary and indicates the gear is too cold or

crankshaft gear (11).

cocked on shaft. Aline "C" marks on gears and mesh

Note. If suitable gear puller is not available, gear

gears for proper timing.

may be removed by drilling at the keyway and splitting

(3) Install deflector (12,fig.3-3) on crankshaft

the gear. Drill directly above key to avoid damage to

and secure with screws (13).

shaft.

(4) Secure camshaft gear (16, fig. 3-6) to

(4) Remove governor gear (para 4-15).

camshaft with retaining ring (17).

3-38. Cleaning and Inspection

(5) Check gears for backlash of 0.002 to 0.004

a. Clean all parts with cleaning compound, solvent

inch. Looser fits are tolerable provided looseness is not

(Spec. P-S-661). Dry thoroughly with compressed air.

so excessive as to cause chatter. A slightly loose fit is

b. Inspect gears for cracks, chips or other signs of

preferable over a tight fit.

excessive wear and damage.

b. Timing Gear Cover.

c. Inspect cover for cracks, dents, breaks and other

(1) Insert spring pin (32, fig. 3-11) and cover

damage.

(13) and install cover and gasket (3) on front plate (10)

d. Replace defective parts as authorized.

and secure with screws (28 and 29) and lock washers

(22).

(2) Install oil breather cap (1), oil seal (30), and

oil seal retainer (31) on timing gear cover.

3-16