NOTE: When reassembling the primary rocker arm, carefully apply air pressure to oil passage of the rocker arm.
1. Inspect the rocker arm piston. Push it manually. - If it does not move smoothly, replace the rocker arm assembly.
NOTE: • Apply oil to the pistons when reassembling. • Bundle the rocker arms with a band to prevent them from separating.
D15Z1 engine: NOTE: Set the timing plate and return spring as shown below.
D16Z6 engine only:
2. Pushing the rocker arm top gently with the finger will cause it to sink slightly. Increasing the force on it will cause it to sink deeper. - If the lost motion assembly does not move smoothly, replace it.