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): 0.019-0.050 mm
(0.0007-0.0020 in.)
Service Limit: 0.08 mm (0.0031 in.) 


6.Repeat for all rockers 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 intake secondary rocker arm needs replacement, replace the secondary rocker arms as an assembly.

VTEC Rocker Arms

7.Inspect the rocker arm pistons (B). Push on them manually. If they do not move smoothly, replace the rocker arm set.

  • Apply new engine oil to the pistons when reassembling.
  • When reassembling the secondary rocker arm A, carefully apply air pressure to the oil passage of the rocker arm.


8.Reassemble the rocker arm assembly.

9.Install the rocker arm assembly.