Rocker Arm and Shaft Inspection

Rocker Arm and Shaft Inspection
1. Remove the rocker arm assembly.
2. Disassemble the rocker arm assembly.
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 the rockers and both shafts. If the clearance is over the limit, replace the rocker shaft and all over-tolerance rocker arms. If any intake rocker arm needs replacement, replace all five rocker arms in that set (intake 1st, 2nd, 3rd, exhaust 1st and 2nd).

Rocker Arms
7. Inspect the rocker arm synchronizing pistons (A). Push them manually. If they do not move smoothly, replace the rocker arm set.

NOTE:
^ Apply new engine oil to the pistons when reassembling.
^ When reassembling the intake 1st and exhaust 1st rocker arms (B), carefully apply air pressure to the oil passage of the rocker arm.





8. Reassemble the rocker arm assembly.
9. Install the rocker arm assembly.