1.2.1 Valve Operating Mechanism
DETROIT DIESEL 53
Fig. 4. - Testing Push Rod Spring
Fig. 3. - Removing Push Rod from Upper Side
4. Remove the two bolts which hold the rocker arm
of Cylinder Head with Tool J 3092-01
shaft brackets to the cylinder head. Remove the
brackets and the shaft.
longitudinal passage enters the drilled rocker arm shafts
5. Loosen the lock nut at the upper end of the push rod,
through the lower end of the drilled rocker shaft bracket
next to the clevis, and unscrew the rocker arm from the
bolts and lubricates the rocker arms.
Excess oil from the rocker arms lubricates the exhaust
valves and cam followers. Additional cam follower
lubrication is provided by oil from grooves in the
camshaft bushing bores which is directed against the
cam follower rollers.
Remove Rocker Arms and Rocker Arm Shaft
1. Clean and remove the valve rocker cover.
2. Remove the fuel pipes from the injector and the
CAUTION: Immediately after removing
the fuel pipes, cover each injector
opening with a shipping cap to prevent
dirt or other foreign matter from entering
Fig. 5. - Cam Roller Wear and Clearance
3. Bar the engine over in the direction of engine rotation
or crank the engine with the starting motor to bring the
push rod ends -- the outer ends -- of the injector and
valve rocker arms in line horizontally.
1972 General Motors Corp.