C7 and C9 Industrial Engines Troubleshooting – Valve Rotator or Spring Lock Is Free

Probable Cause


  • Valve Components 

Recommended Actions

Table 1
Troubleshooting Test Steps Values Results
1. Valve Components

A. Inspect the following components for damage:

1. Valve rotators
2. Spring locks
3. Valve springs
4. Valves

B. Ensure that the valve has not contacted the piston. If the valve has contacted the piston, check the exhaust system for debris.

Damaged components Result: The valve components are damaged.

Replace the 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.

Complete the procedure in the order in which the steps are listed.

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).

Posted in C7

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