Cylinder Head 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.

Rocker Arm-to-Shaft Clearance 
Standard (New):  
Intake: 0.025-0.052 mm
(0.0010-0.0020 in.)
Exhaust: 0.018-0.056 mm
(0.0007-0.0022 in.)
Service Limit: 0.08 mm (0.003 in.) 


6.Repeat for all rocker arms and both shafts. If the clearance is beyond the service limit, replace the rocker shaft and all out of service limit rocker arms. If any VTEC rocker arm needs replacement, replace the rocker arms (primary and secondary), as a set.

7.Inspect the rocker arm pistons (A). Push on each piston manually.
If it does not move smoothly, replace the rocker arm set.

NOTE: Apply oil to the pistons when reassembling.


8.Install the rocker arm assembly.