Rocker Arms and Shaft Inspection

Inspection





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





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





3. Measure the inside diameter of the rocker arm, and check it for an out-of-round condition.
Rocker Arm-to-Shaft Clearance:
Standard (New): 0.021 - 0.041 mm (0.0008 - 0.0016 inch)
Service Limit: 0.07 mm (0.003 inch)
4. Repeat for all rocker arms and both shafts. If the clearance is over the limit, replace the rocker shaft and all overtolerance rocker arms. If any rocker arm needs replacement, replace all three rocker arms in that set (primary, mid, and secondary).





5. 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 oil to the pistons when reassembling.