Section IX. TIMING GEARS AND COVER

TM 10-3930-621-34

(1) Use fuse wire or a special crushing gage

or runout in a crankshaft makes it impossible to fit

material (do not use acid or rosin core solder).

bearings accurately. For this reason, the time spent in

(2) Place crushing gage material between shaft

making this test ;s well worth while.

and bearing, then tighten bearing in place using the

c. Crankshaft. If the proper equipment is available, a

normal torques of 88-92 foot-pounds for main bearings.

magnetic inspection of the crankshaft and other stressed

(3) Remove cap and bearing. Gently remove

parts is recommended.

crushing gage material and use a micrometer to check

for correct clearance. Any unusual bending

Note. When installing, coat all bearing running

surfaces with clean, fresh engine oil (OE).

Section IX. TIMING GEARS AND COVER

3-36. Description

(4) Remove two screws (26, fig. 3-11) and lock

The timing gear group consists of crankshaft, camshaft

washers (22) attaching engine front support (16) to the

and governor gears. These gears are located under a

timing gear cover (13).

gear cover behind the fan belt drive pulley.

(5) Remove remaining engine support attaching

3-37. Removal

parts (14, 15, 17, 18 and 19) and remove support.

a. Timing Gear Cover.

(6) Remove oil breather cap (1), oil seal (30),

(1) Remove the hydraulic pump assembly with

and oil seal retainer (31) from timing gear cover.

mounting plate (para 10-38).

(7) Remove timing gear cover (13) by removing

(2) Remove crankshaft drive pulley (14 fig. 3- 3)

screws (28 and 29) and lock washers (22). Tilt cover

by removing the self-locking nut (16) and using a suitable

and remove spring pin (32) and gasket (3).

gear puller.

(3) Support front portion of engine with suitable

hoist.

KEY to fig. 3-11:

1. Breather cap

19.

Self-locking nut

2. Oil filler tube

20.

Shim

3. Gear cover gasket

21.

Pump plate

4. Front plate gasket

22.

Lock washer

5. Screw

23.

Screw

6. Lock washer

24.

Screw

7. Cover

25.

Screw

8. Gasket

26.

Screw

9. Plate assembly

27.

Dowel pin

10. Front plate

28.

Cap screw

11. Stud

29.

Cap screw

12. Pin

30.

Oil seal

13. Gear cover

31.

Oil seal retainer

14. Screw

32.

Spring pin

15. Flat washer

33.

Screw

16. Support

34.

Lock washer

17. Mount

35.

Dowel pin

18. Alining washer

3-15