Troubleshooting and Test Steps and Results
1. Lubrication
A. Remove the valve cover. Refer to Disassembly and Assembly, “Valve Cover – Removal and Installation” for correct procedures.
B. Turn the engine around to check the lubrication in the valve chamber. Ensure sufficient engine oil flow in the valve chamber. The engine oil passages must be clean.
Note: Do not run the engine while the valve cover is removed.
Result: Insufficient oil flow in the valve mechanism.
Repair: Ensure engine oil passages are clean.
Result: Normal oil flow in the valve mechanism.
Proceed to Test Step 2.
2. Valve Train Components
A. Inspect the following components of the valve train for abnormalities or excessive wear, straightness, and cleanliness.
Result: Wear, bending, or unclean valve train components.
Repair: Repair or replace the components.
• Rocker arm
• Valve bridge
Note: If the camshaft is replaced,
• Pushrods must also be installed with new valve lifters
• Hydraulic lifters
• Camshaft
• Valve stems
Result: All valve train components
• Rocker arm shaft is normal.
