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Rocker Arm and Shaft Inspection
Rocker Arm and Shaft Inspection1. 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 rockers and both shafts. If the clearance is over the limit, replace the rocker shaft and all over-tolerance rocker arms. If any variable cylinder management rocker arm needs replacement, replace all rocker arms in that set (primary and secondary).
Variable Cylinder Management Rocker Arms
7. Inspect the rocker arm pistons (A).Slide them into the rocker arms. If they do not move smoothly, replace the rocker arm set.
NOTE:
^ Apply new engine oil to the pistons when reassembling.
^ When removing the pistons from the intake primary rocker arm B and exhaust secondary rocker arms (C), carefully apply air pressure to the oil passage of the rocker arm.
8. Install the rocker arm assembly.