1.2.1 Valve Operating Mechanism
DETROIT DIESEL 53
Fig. 3 - Removing Push Rod from Upper Side of
Fig. 4 - Testing Push Rod Spring
Cylinder Head with Tool J 3092-01
longitudinal passage enters the drilled rocker arm shafts through the lower end of the drilled rocker shaft bracket 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
Clean and remove the valve rocker cover.
Remove the fuel pipes from the injector and the fuel connectors.
CAUTION: Immediately after removing the fuel pipes, cover each injector opening
with a shipping cap to prevent dirt or other foreign matter from entering the injector.
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.
4. Remove the two bolts which hold the rocker arm shaft brackets to the cylinder head. Remove the brackets and the
5. Loosen the lock nut at the upper end of the push rod, next to the clevis, and unscrew the rocker arm from the push
Fig. 5 - Cam Roller Wear and Clearance Diagram