Lesson 3/Learning Event 1
Rocker Assembly and Valves
The rocker arm cover houses the safety relief valve. It is removable for valve adjustment.
Adjustment of the valves is normally a direct support maintenance function.
Use figure 18 as a guide when removing the rocker arm cover for inspection or cleaning. The
rocker arm cover is also called the valve cover.
Step 1. Remove the rocker arm cover mounting screw and remove the cover. Remove and
discard the gasket
Remove the relief valve.
After removal of the rocker arm cover and relief valve, clean and inspect the components.
Clean the parts with dry-cleaning solvent PD-680.
Dry-cleaning solvent used to clean parts, is potentially dangerous to
personnel and property. Avoid repeated and prolonged skin contact. Do
NOT use near open flame or excessive heat.
Step 2. Inspect the rocker arm cover for cracks or breaks; inspect the gasket face for nicks,
scratches, or warpage, and stripped or damaged threads.
Inspect the relief valve for dirt, restricted passage, or improper operation.
Replace or repair damaged or defective parts.