DETROIT DIESEL 53
1.2.1 Valve Operating Mechanism
Fig. 3 - Removing Push Rod from Upper Side
of Cylinder Head with Tool J 3092-01
longitudinal passage enters the drilled rocker arm
Fig. 4 - Testing Push Rod Spring
shafts through the lower end of the drilled rocker
shaft bracket bolts and lubricates the rocker arms.
4. Remove the two bolts which hold the rocker arm
shaft brackets to the cylinder head. Remove the
Excess oil from the rocker arms lubricates the exhaust
brackets and the shaft.
valves and cam followers. Additional cam follower
lubrication is provided by oil from grooves in the
5. Loosen the lock nut at the upper end of the push
camshaft bushing bores which is directed against the
rod, next to the clevis, and unscrew the rocker arm
cam follower rollers.
from the push rod.
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 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.
Fig. 5 - Cam Roller Wear and Clearance