TM-9-2815-205-24

6V53/6V53T ENGINES, DIESEL WITH CONTAINERS; MODEL 5063-5299, MODEL 5063-5392, MODEL 5063-5393 AND MODEL 5063-539L

TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE

FEBRUARY 2013
TM-9-2815-205-24

  TM-9-2815-205-24 - Page 548 of 856

REPAIR OR REPLACEMENT - Continued
CAUTION
The difference in load of a pair of valve springs under one bracket must not exceed
6 pounds or exhaust valve bracket will be unbalanced.
Replace both springs under an exhaust valve bracket together. Mating a new
spring with a used spring can cause unbalanced valve operation.
7.
Cam followers and cam follower springs inspection and replacement procedures:
a.
Examine cam follower springs (Figure 15, Item 25) for wear or damage. Using spring tester
(Figure 15, Item 77), check spring load. Replace spring if a load less than 250 lbs compresses spring
to 2.14 inches (5.44 cm).
25
77
0.011–0.023 in.
(0.28–0.58 mm)
0.010 in.
(0.25 mm)
MAINT_261
Figure 15.
Cylinder Head Cam Spring Follower Load Test.
CAUTION
Do not use fuel oil to clean cam followers. Lubricating oil will be washed away and
cause scoring of cam roller bushing at startup.
b.
Wash cam followers with engine oil and wipe dry. Examine rollers for pitting, scoring, and flat spots.
Rollers (Figure 16, Item 78) must turn freely on their pins (Figure 16, Item 79).
c.
Using a dial indicator and holding fixture, measure total diametric clearance on roller. Install cam
follower assembly in a vise or other holding device and place dial indicator needle against outside
diameter of roller. To obtain total clearance, move roller in crosswise direction. Maximum clearance is
0.010 inch (0.03 mm).
d.
Using thickness gages, measure side clearance on cam follower. Insert gage between end of roller
and leg of cam follower body. Side clearance must be 0.011–0.023 inch (0.28–0.58 mm).
e.
If necessary, install new roller and pin as follows:
(1)
Clamp holding fixture (Figure 16, Item 80) in a vise and place cam follower in groove at top of
fixture with pin resting on top of small plunger.
TM 9-2815-205-24
0083
0083-18


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