Rocker Arm and Shaft Inspection
Rocker Arm and Shaft Inspection1. Remove the dipstick, Positive Crankcase Ventilation (PCV) hose, and breather hose.
2. Remove the ignition coil cover, then remove the ignition coils.
3. Remove the cylinder head cover.
4. Loosen the rocker arm adjusting screws.
5. Remove the camshaft holders and camshafts. To prevent damaging the camshafts, unscrew the camshaft holder bolts two turns at a time, in a crisscross pattern.
6. Insert the bolts into the rocker shaft holder, then remove the rocker arm assembly.
7. Disassembly the rocker arm assembly.
8. Measure the diameter of the shaft at the first rocker location.
9. Zero the gauge (A) to the shaft diameter.
10. Measure the inside diameter of the rocker arm, and check it for an out-of-round condition.
11. 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).
12. 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 pistons when reassembling
13. Reassemble the rocker arm assembly.