Rocker Arm Assembly: Testing and Inspection

Rocker Arm Inspection






The rocker arm shafts are hollow and are used as lubrication oil ducts. The rocker arm shaft on the right side of the engine has an oil passage hole from the cylinder head located at the third rocker shaft support pedestal. The rocker arm shaft on the left side of the engine has an oil passage hole from the cylinder head located at the second rocker shaft support pedestal.

• To prevent air ingestion into the rocker arm lash adjusters, avoid turning the rocker arm upside down.


Do not allow the rocker arm to rest on the lash adjusters, as damage may occur to the lash adjuster and plastic retainer.

The intake and exhaust rocker arms are different. They should be identified before disassembling.






Check the rocker arm for wear or damage:

• Roller (3) scuffing or wear.

• Shaft bore scuffing or wear.

• Swivel pad (2) on lash adjuster (1) missing or broken.

• Rocker arm showing signs of fatigue or cracking.

• Roller axle protruding from arm.

Replace the rocker arm if any shows signs of wear.


Do not remove the lash adjuster from the rocker arm. Damage to the adjuster and rocker arm will result.