TM 5-6115-400-35
adapter on a slide hammer puller,;
manifold and the fuel injection'
pull pin from cylinder head.
tubes.
Remove valve rocker
(2) Installation. Using a press, press a new
housing.
Loosen rocker arm
guide pin into cylinder head until top of
adjusting screw in the valve rocker
pin stands out 2 inches above top flat
arms sufficiently so rocker arms
machined surface of the cylinder head or
may be moved to one side.
2 11/16 inches above counterbore at
Remove valve bridges (para a
which guide pin is located. The guide pin
above).
bore in the cylinder head is .4945
(b) Make certain that the piston in
inch.4960 inch.
cylinder from which valve springs
c. Valve Springs and Rotators.
are to be removed, is at top dead
(1) Removal. The intake and exhaust valve springs
center.
Using a suitable spring
and rotators may be removed without removing
compressing tool, remove spring
the cylinder heads from the engine. The valve
retainer locks (1, fig.
55) and
spring and damper assembly (3, fig.55) is
carefully release tension on valve
serviced as a unit. To remove the valve springs
spring.
Remove valve spring,
without removing the cylinder heads, proceed as
rotator, and spring seat.
follows:
(2) Inspection.
(a) Remove valve rocker cover.
(a) Inspect valve springs. Both intake
Disconnect and remove fuel return
and exhaust valve springs should
have a load of 50-63 lbs. when
compressed to a length of 2 13/64
inches and a load of 136-150 lbs.
when compressed to a length of"1
21/32 inches. Install a new Spring
when old spring is 5% under or over
the specified load limits.
(b) After engine is running, remove
valve rocker covers and visually
observe valve rotators.
If any
rotators are not rotating, they must
be replaced.
Figure 54. Removing valve bridge guide pin.
Figure 55. Valve and valve components.
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