Rocker Arm Assembly: Service and Repair

ROCKER ARM

REMOVAL
1. Disconnect the battery negative cables.
2. Remove cylinder head cover.





3. Remove the rocker arm/pedestal fasteners and remove rocker arm (1) and pedestal (2) from cylinder head. Mark the arms and pedestals so they can be installed in their original position.

CAUTION: When removing the rocker arms, the sockets may come loose and fall into the engine. Make sure they stay with the arm upon removal/installation.





4. Lift the push rod(s) up and out of the engine. Mark them so they can be installed in their original position.

NOTE: The #5 cyl. intake and exhaust and #6 cyl. intake and exhaust push rods must be raised through the provided cowl panel access holes.

5. Lift the crosshead(s) off of the valve stems. Mark them so they can be installed in their original position.

CLEANING





Clean all components in a suitable solvent. If necessary, use a wire brush or wheel to remove stubborn deposits. Rinse in hot water and blow dry with compressed air. Inspect oil passages in rocker arms and pedestals. Apply compressed air to lubrication orifices to purge contaminants.

INSPECTION
Rocker Arms





1. Remove rocker shaft and inspect for cracks and excessive wear in the bore or shaft. Remove socket and inspect ball insert and socket for signs of wear. Replace retainer if necessary.
Measure the rocker arm bore and shaft.








Push Rods





Inspect the push rod ball and socket for signs of scoring. Check for cracks where the ball and the socket are pressed into the tube.
Roll the push rod on a flat work surface with the socket end hanging off the edge. Replace any push rod that appears to be bent.

Crossheads





Inspect the crossheads for cracks and/or excessive wear on rocker lever and valve tip mating surfaces.

INSTALLATION
1. If previously removed, install the push rods in their original location. Verify that they are seated in the tappets.
2. Lubricate the valve tips and install the crossheads in their original locations.
3. Lubricate the crossheads and push rod sockets and install the rocker arms and pedestals in their original locations. Tighten bolts to 36 Nm (27 ft. lbs.) torque.
4. Verify valve lash adjustment.
5. FOR EARLY BUILDS Install cylinder head cover and reusable gasket.
6. FOR LATE BUILDS Install cylinder head cover.
7. Connect battery negative cables.