66. Valve Rocker Arm and Shaft Clean and Inspect

Valve Rocker Arm and Shaft Cleaning and Inspection





1. Measure the rocker arm shaft outside diameter where the rocker arm is located. The production value is 21.979 - 22.0 mm (0.8653 - 0.8661 inch) and the service limit is 21.85 mm (0.8602 inch).
2. Replace the rocker arm shaft if the measured value is less than the service limit.





3. Measure the rocker arm inside diameter. The production value is 22.01 - 22.035 mm (0.8665 - 0.8675 inch).
4. Calculate the rocker arm shaft to rocker arm clearance.
4.1. Subtract the rocker arm shaft outside diameter from the rocker arm inside diameter.
4.2. Replace the rocker arm if the rocker arm shaft to rocker arm clearance is over 0.2 mm (0.0079 inch).
5. Inspect the valve lash adjusting screw and lock nut for damage. Replace the valve lash adjusting screw if any damage is found.





6. Measure the pushrods for warpage.
7. Replace the pushrod if the warpage exceeds 0.8 mm (0.031 inch).