For 1990-2009 cars

1. Measure the straightness of the rocker arm shaft by using the V block and the dial gage.
2. Replace the rocker arm shaft if the measured valve is over the specification limit.

Specification
The specification limit of the rocker arm shaft is 0.10 mm (0.0039 in).

3. Measure the outer diameter of the rocker arm shaft using a micrometer to check the clearance between the rocker arm and the rocker arm shaft.
4. Measure the inner diameter of the rocker arm using a bore gage (1).
5. If the difference is over the limit between the outer diameter and the inner diameter, replace the shaft or the rocker arm, or both if necessary.

Specification
The limit is 0.005-0.040 mm (0.0002-0.0016 in).