Low oil pressure

1. Perform an oil pressure test. Refer to 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.

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 or dirty valve lash adjusters

Replace the valve lash adjusters.

Stretched or broken timing chain and/or damaged sprocket teeth

Replace the timing chain and sprockets.

Worn, damaged, or faulty timing chain tensioners

Replace tensioners

Worn engine camshaft lobes

1. Inspect the engine camshaft lobes.
2. Replace the camshaft and valve lash adjusters 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: