Rocker Arms and Lost Motion Assemblies

Inspection (D16Z6, D15Z1 engine)

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.