Check the camshaft thrust plates (32) for scoring. Replace the thrust plates if scored deeper than 0.0003
inch (0.008 mm).
Measure the thickness of the camshaft thrust plates (32). Replace if the minimum thickness is not in
accordance with Table 1-4.
Inspect the camshaft gears in accordance with paragraphs 9-17 and 9-18.
Inspect the camshaft bushings and replace as necessary in accordance with paragraph 9-16.
Inspect the timing gear cover in accordance with paragraph 9-17.
Check all threaded fasteners and holes for stripping and thread damage. Replace threaded fasteners that
are stripped. Repair minor thread damage by chasing. Repair stripped holes in accordance with
Insulated gloves are required to avoid bums when handling heated parts.
If removed, heat the left or right bank camshaft gear (29 or 30, Figure 9-15) at 400*F (204"C) for 1 hour in
a preheated oven.
Support the right or left bank camshaft (26 or 27) in a press, coat the camshaft gear hub and thrust plate
(32) with anti-seize compound MIL-A-907, and install the thrust plate of the camshaft so that the grooved
side of the thrust plate will face the gear.
Install the key (31) in the camshaft (26 or 27). If a new key is used, be sure it is the same part number as
the old key.
Press the hot gear on the shaft until it is seated against the shoulder. Maintain a slight pressure on the
gear until it cools.
Rotate the engine and align the timing marks on the crankshaft and idler gears (1, 2, 3, and 6, Figure 9-
Install the camshaft pilot ST-1 313 on the rear of the camshaft.
Lubricate the camshaft lobes, journals, and thrust plate with lubricating oil MIL-L-2104.
With a second technician to observe and support the rear of the camshaft (26 or 27, Figure 9-15) carefully
insert the camshaft. Support the front of the camshaft while inserting, and take care that the camshaft
lobes do not score the camshaft bushings.
Rotating the camshaft back and forth will aid installation.
Before meshing the camshaft gear with the idler gear, rotate the camshaft to align the timing marks as
shown in Figure 9-16.
Using new lock-plates (24, Figure 9-15), install the thrust plate capscrews (25), and tighten to 30 to 35
pound-feet (41 to 47 newton-meters). Bend the tabs on the lock-plates to secure the capscrews.
Remove the camshaft pilot ST-1 313 from the rear of the camshaft.
Install the other camshaft by repeating steps (1) through (11), above.
Check the gear backlash and camshaft end clearance in accordance with paragraph 9-18.
If the backlash or end clearance is unsatisfactory, replace the gears or thrust washers in accordance with
If a new camshaft has been installed, check the injector timing in accordance with paragraph 9-18.
If the injector timing is incorrect, install one of the optional camshaft keys in accordance with paragraph 9-
Using new gaskets (23, Figure 9-15), install the rear camshaft covers (22), plain washers (20), lockwashers
(21), and capscrews (19). Tighten the capscrews to 30 to 35 pound-feet (41 to 47 newton-meters).
Install the push rods and followers in accordance with paragraph 9-14.
Install the rocker arms in accordance with paragraph 9-10.
Install the timing gear cover in accordance with paragraph 9-18.