TIP- 4218946 - Caterpillar

Probable Cause
Valve ComponentsRecommended Actions
Table 1
Troubleshooting Test Steps Values Results
1. Inspect the Valve Components
A. Inspect the following valve components for damage:
- Valve rotators
- Spring locks
- Valve springs
- Valves
B. Ensure that the valve has not contacted the piston. If the valve has contacted the piston, check the exhaust system for debris.
Valve Components
Result: The valve components are damaged.
Repair: Replace damaged components.
A valve rotator that is cracked or a valve rotator that is broken is an indication of an engine overspeed. Determine the cause of the engine overspeed. Repair the condition.
Verify that the repair eliminated the problem.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).