TM 5-3810-300-24&P-3
Valve Operating Mechanism 1.2.1
surface may be refaced up to a maximum of .010".
remove the nut, flat washer and tool from the push rod.
However, proceed with caution when surface grinding to
avoid overheating the rocker arm. Maintain the radius
7. Pull the push rod, spring, spring seats and cam
and finish as close to the original surface as possible.
follower out of the cylinder head.
Also inspect the valve bridges (four-valve head) for wear.
Remove Cam Follower and Push Rod (Cylinder
Remove Cam Follower and Push Rod (with Cylinder
Head Removed)
Head on Engine)
When removing the cam followers and associated paits,
tag them so they may be reinstalled in their original
When removing the cam followers and associated parts,
location.
tag them so they may be reinstalled in their original
1. Rest the cylinder head on its side (Fig. 4) and
location.
remove the cam follower guide.
To remove a push rod, spring, spring seats and cam
2. Pull the cam follower out of the cylinder head.
follower from the top of the cylinder head, proceed as
3. Remove the fuel pipes from the injector and the fuel
follows:
connectors.
1. Remove the rocker arm shaft and brackets as
outlined under Remove Rocker Arms and Shaft.
CAUTION: Immediately after removing the fuel
2. Loosen the lock nut and unscrew the rocker arm
pipes, cover the' injector fuel inlet and outlet
from the push rod to be removed. Remove the lock nut.
openings with shipping caps to prevent dirt or
3. Install remover J 3092-01, a flat washer and the
foreign material from entering.
lock nut on the push rod, with the lower end of the tool
4. Loosen the push rod lock nut and unscrew the push
resting on the upper spring seat.
rod from the rocker arm clevis.
4. Thread the nut down to compress the spring.
5. Pull the push rod and spring assembly from the
5. Remove the spring seat retainer from the groove in
bottom of the cylinder head.
the cylinder head (Fig. 3).
6. Remove the push rod lock nut, spring and spring
6. Unscrew the lock nut to release the spring. Then
seats from the push rod.
If the cylinder head is to be replaced, remove the spring
retainers and install them in the new head.
Inspection
Proper inspection and service of the cam follower is very
necessary to obtain continued efficient engine
performance. When any appreciable change in injector
timing or exhaust valve clearance occurs during engine
operation, remove the cam followers and their related
parts and inspect them for excessive wear. This change
in injector timing or valve clearance can usually be
detected by excessive noise at idle speed.
Wash the cam followers with lubricating oil or Cindol
1705 and wipe dry. Do not usefuel old. Fuel oil working
its way in between the cam roller bushing and pin may
Fig. 4. Cam Followers and Guide.
cause scoring on initial start-up of the engine since fuel
oil does not provide adequate lubrication. The push rods,
springs and spring seats may be washed with clean fuel
oil and dried with compressed air.
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