| 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 finger-follower | Inspect valve finger-follower, valve bridge, valve finger follower lifter, oil pump and engine block oil galleries. Repair or replace all damaged components. |
| Worn or damaged valve finger-follower | Inspect valve bridge and finger-follower. 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. |
| Worn or faulty camshaft lobes | Inspect camshaft lobes. If damaged replace camshaft and all valve finger-followers. |
| Damaged or misaligned timing gears | Inspect timing gears. Replace all damaged components. |
Upper Engine Noise, Regardless of Engine Speed