Rocker Arm and Shaft Inspection

Rocker Arm and Shaft Inspection

1. Remove the rocker arm assembly. Cylinder Head Inspection for Warpage

2. Disassemble the rocker arm assembly. Rocker Arm and Shaft Disassembly/Reassembly

3. Measure the diameter of the shaft at the first rocker location.






4. Zero the gauge (A) to the shaft diameter.






5. Measure the inside diameter of the rocker arm, and check it for an out-of-round condition.





6. Repeat for all rocker arms and both shafts. If the clearance is over the limit, replace the rocker shaft and all over-tolerance rocker arms. If any rocker arm needs replacement, replace all three rocker arms in that set (primary, mid, and secondary).






7. Inspect the rocker arm pistons (A). Push each piston manually. If it does not move smoothly, replace the rocker arm assembly.
NOTE:

- When reassembling the primary rocker arm (B), carefully apply air pressure to its oil passage.

- Apply new engine oil to the rocker arm pistons when reassembling.

8. Reassemble the rocker arm assembly. Rocker Arm and Shaft Disassembly/Reassembly

9. Install the rocker arm assembly. Rocker Arm Assembly Installation