TM-9-2815-205-34

ENGINE WITH CONTAINER; MODELS 5063-5299, 5063-5392, 5063-5393, 5063-5395, 5063-5398, 5063-539F, 5063-539L

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

AUGUST 1992

TM-9-2815-205-34 - Page 432 of 596

TM 9-2815-205-34

3-64. CYLINDER HEAD ASSEMBLY REPAIR (Cont)

CAUTIO N

•

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.

(a) Examine cam follower springs (26) for

wear or damage. Using spring tester

(74), check spring Ioad. Replace

spring if a load less than 250 Ibs

compresses spring to 2.14 inches

(5.44 cm).

CAUTION

(b)

(c)

(d)

(e)

Do not use fuel oil to clean cam

followers. Lubricating oil will be

washed away and cause scor-

ing of cam roller bushing at

startup.

Wash cam followers with engine oil

and wipe dry. Examine rollers for

pitting, scoring, and flat spots. Rollers

(75) must turn freely on their pins

(76).

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).

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).

If necessary, install new roller and pin as follows:

1. Clamp holding fixture (77) in a vise and place cam follower in groove at top of fixture

with pin resting on top of small plunger.

3-302