Cause
|
Correction
|
Low oil pressure
|
| • |
Repair or replace as required. |
|
Loose and/or worn valve rocker arm attachments
|
| • |
Inspect the valve rocker arm stud, nut or
bolt. |
| • |
Repair or replace as required. |
|
Worn or damaged valve rocker arm
|
Repair or replace as required.
|
Improper lubrication to the valve rocker arms
|
Inspect the following components, and repair or replace as
required:
| • |
The oil filter bypass valve |
| • |
The oil pump and pump screen |
| • |
The engine block oil galleries |
|
Broken valve spring
|
Replace the valve spring.
|
Excessive valve lash
|
| • |
Inspect valve lash adjusters. |
|
Bent valve pushrod
|
| • |
Inspect valve pushrod and valve rocker arm. |
| • |
Repair or replace as required. |
|
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
|
| • |
Inspect the engine camshaft lobes. |
| • |
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:
|
Damaged or misaligned timing gears
|
| • |
Replace all damaged components. |
|
