Rocker Arms and Shafts Disassembly/Reassembly/Inspection

Rocker Arms and Shafts Disassembly/Reassembly





NOTE:
- Identify parts as they are removed to ensure reinstallation in their original locations.
- Inspect rocker shafts and rocker arms.
- Rocker arms must be installed in the same position if reused.
- Prior to reassembling, clean all the parts in solvent, dry them, and apply lubricant to any contact points.
- Bundle the rocker arms with rubber bands to keep them together as a set.

Rocker Arms and Shafts 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.
4. 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).





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.