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Cause
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Correction
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Low oil pressure
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Repair or replace as required.
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Loose and/or worn valve rocker arm attachments
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Inspect the valve rocker arm stud, nut, or bolt.
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•
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Repair or replace as required.
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Worn or damaged valve rocker arm
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Repair or replace as required.
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Improper lubrication to the valve rocker arms
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Inspect the following components and repair or replace, as required:
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•
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The oil filter bypass valve
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•
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The oil pump and pump screen
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•
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The engine block oil galleries
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Broken valve spring
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Replace the valve spring.
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Excessive valve lash
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•
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Inspect valve lash adjusters.
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Bent valve pushrod
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•
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Inspect valve pushrod and valve rocker arm.
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•
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Repair or replace as required.
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Worn or dirty valve lash adjusters
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Replace the valve lash adjusters.
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Stretched or broken timing chain and/or damaged sprocket teeth
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Replace the timing chain and sprockets.
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Worn, damaged, or faulty timing chain tensioners
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Replace tensioners
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Worn camshaft lobes
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•
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Inspect the engine camshaft lobes.
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•
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Replace the camshaft and valve lash adjusters as required.
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Worn valve guides or valve stems
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Inspect the following components and repair, as required:
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Stuck valves
Carbon on the valve stem or valve seat may cause the valve to stay open.
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Inspect the following components and repair, as required:
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Damaged or misaligned timing gears
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•
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Replace all damaged components.
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