| Low oil pressure |
- Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .
- Repair or replace as required.
|
| Loose and/or worn follower, valve rocker arm |
- Inspect the follower, valve rocker arm.
- Repair or replace as required.
|
| Improper lubrication to the followers, valve rocker arms |
Inspect the following components, and repair or replace as required:
- The follower, valve rocker arm
- The SHLA, valve lifter
- The oil filter bypass valve
- The oil pump and pump screen
- The cylinder head oil galleries
- The engine block oil galleries
|
| Broken valve spring |
Replace the valve spring. |
| Worn or dirty stationary hydraulic lash adjusters (SHLAs), valve lifters |
Replace the SHLAs, valve lifters. |
| Stretched or broken timing chain or chains and/or damaged sprocket teeth |
Replace the timing chain or chains and sprockets. |
| Worn timing chain tensioner or tensioners |
Replace the timing chain tensioner or tensioners as required. |
| Worn timing chain shoe or shoes |
Replace the timing chain shoe or shoes as required. |
| Worn timing chain guide or guides |
Replace the timing chain guide or guides as required. |
| Worn engine camshaft lobes |
- Inspect the engine camshaft lobes.
- Replace the camshaft or camshafts and SHLAs, valve lifters, as required.
|
| Worn valve guides or valve stems |
Inspect the following components, and repair as required:
- The valves
- The valve guides
|
- 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:
- The valves
- The valve guides
|