Low oil pressure

Loose and/or worn valve rocker arm attachments

Worn or damaged valve rocker arm

Bent or damaged pushrod

Inspect the following components and replace, as required:

Inspect the top of the pistons for valve contact. If the top of the piston shows valve contact, replace the piston and pin assembly.

Improper lubrication to the valve rocker arms

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

Broken valve spring

Replace the valve spring and spring shim.

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 engine camshaft lobes

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:

Cut or damaged oil pump screen O-ring seal, which may cause aeration of the engine oil

Repair, as required. Refer to Oil Pressure Diagnosis and Testing .