Condition
| Action
|
Low oil pressure
| Insufficient or poor oil supply to valve train.
- Perform oil pressure test.
- Repair or replace all damaged components.
|
Improper lubrication to the valve rocker arms
|
- Inspect valve rocker arm and shaft, valve pushrod, oil filter bypass valve, oil pump and pump screen, and engine block oil galleries.
- Repair or replace all damaged components.
|
Excessive valve lash
|
- Check the valve lash adjustment, and correct if above specifications.
- Repair or replace all damaged components.
|
Worn pushrod upper end ball
|
- Inspect pushrod end ball.
- Repair or replace all damaged components.
|
Bent valve pushrod
|
- Inspect valve pushrod and valve rocker arm.
- Repair or replace all damaged components.
|
Loose, worn or damaged valve rocker arm
|
- Inspect valve rocker arm and rocker arm shaft.
- Repair or replace all damaged components.
|
Loose valve rocker arm attachments
|
- Inspect valve rocker arm and rocker arm shaft.
- Repair or replace all damaged components.
|
Broken valve springs
|
- Inspect valve springs.
- Repair or replace all damaged components.
|
Worn and/or damaged valve spring shims, seats, or keys
|
- Inspect valve spring shims, seats, and keys.
- Repair or replace all damaged components.
|
Sticking valve
| Carbon on the valve stem or valve seat may cause the valve to stick.
- Inspect valves and valve guides.
- Repair or replace all damaged components.
|
Missing or improperly positioned lifter guides
|
- Inspect lifter guides.
- Repair or replace all damaged components.
|
Worn or faulty camshaft lobes
|
- Inspect camshaft lobes.
- If damaged replace camshaft and all lifters.
|
Worn valve guide
|
- Inspect the valves and valve guides.
- Repair or replace all damaged components.
|
Damaged or misaligned timing gears
|
- Inspect timing gears.
- Replace all damaged components.
|