Engine oil overfull - oil aeration

Remove excess oil, set to proper level.

Low oil pressure

1. Perform an oil pressure test. Refer Oil Pressure Diagnosis and Testing .
2. Repair or replace as required.

Loose and/or worn valve rocker arm attachments

1. Inspect the valve rocker arm stud, nut, or bolt.
2. Repair or replace as required.

Worn valve rocker arm

Replace the valve rocker arm.

Bent or damaged push rod

Inspect the following components, and replace as required:

Improper lubrication to the valve rocker arms

Inspect the following components, and repair or replace as required:

Broken valve spring

Replace the valve spring.

Worn and/or damaged valve rotators

Replace the valve rotators as required.

Worn or dirty valve lifters

Replace the valve lifters.

Stretched or broken timing chain and/or damaged sprocket teeth

Replace the timing chain and sprockets.

Worn timing chain dampener

Replace the timing chain dampner.

Worn engine camshaft lobes

1. Inspect the engine camshaft lobes.
2. Replace the camshaft and valve lifters as required.

Worn valve guides or valve stems

Inspect the following components, and repair as required:

Stuck valves--carbon on the valve stem or valve seat may cause the valve to stay open

Inspect the following components, and repair as required: