TM 9-6115-604-34
NAVFAC P-8-633-34
SECTION III. MAINTENANCE OF CAMSHAFTS, BUSHINGS, AND COVER GEARS
9-15. CAMSHAFTS AND GEARS MAINTENANCE
a.
Inspect. The camshaft lobes can be inspected without removing the camshaft from the engine. Inspect the
camshaft lobes as follows:
(1)
Remove the push rods and followers in accordance with paragraph 9-14.
(2)
While slowly rotating the engine, visually inspect the camshaft lobes for scoring, flaking, chipping, and
abnormal wear.
(3)
If the camshaft lobes are scored over 0.0002 inch (0.005 mm) deep, or show flaking, chipping, or abnormal
wear, replace the camshaft.
b.
Remove. Remove the camshafts as follows (see Figure 9-15):
(1)
Remove the radiator in accordance with the Operator and Organizational Maintenance Manual.
(2)
Remove the front engine support in accordance with paragraph 9-36.
(3)
Remove the timing gear cover in accordance with paragraph 9-18.
(4)
Remove the rocker arms in accordance with paragraph 9-5.
(5)
Remove the push rods and followers in accordance with paragraph 9-14.
(6)
Check the timing gear backlash and end play in accordance with paragraph 9-18 to determine if further
repair or replacement is necessary.
NOTE
If only one camshaft or camshaft gear is to be remove, match-mark the camshaft gear and cam
idler gear prior to removal.
NOTE
If the camshaft and gears are to be reinstalled without replacement, omit the following step
(7).
(7)
Using puller kit 3376400, remove the camshaft gears (29 and 30, Figure 9-15) and keys (31), if damaged.
(8)
If the gears have been removed in step NO TAG, above, straighten the tab on the lock-plates (24), remove
the capscrews (25) and remove the thrust plates (32). Discard the lock-plates.
(9)
Remove the capscrews (19), washers (20), lockwashers (21), and remove the rear camshaft covers (22).
Remove and discard the gaskets (23).
(10)
Install the camshaft pilot ST-1313 on the rear of the camshaft.
CAUTION
To avoid scoring the camshaft bushings during camshaft removal or installation, the services
of two technicians are required.
(11)
With a second technician to observe and support the rear of the camshafts (26 and 27), carefully rotate
and withdraw the camshaft. During removal, do not allow the front of the camshaft to drop, and take care
that the camshaft lobes do not score the bushings.
(12)
Remove the camshaft pilot ST-1313 from the rear of the camshaft.
(13)
Remove the other camshaft by repeating steps (9) through (12), above.
9-30
