C175 Oil&Gas Offshore Engine Caterpillar

Engine Overspeeds

Usage:

Use this procedure to troubleshoot an engine overspeed. Also, use this procedure if one of the following event codes is active or logged.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
190-0 Engine Speed : High - most severe (3)	E362 (3) Engine Overspeed	The code requires factory passwords to be cleared.
190-15 Engine Speed : High - least severe (1)	E362 (1) Engine Overspeed	The code is logged.

Probable Causes

Engine load
Turbocharger
Inlet air

Recommended Actions

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Table 2
Troubleshooting Test Steps	Values	Results
1. Check for a Sudden Drop of Engine Load A. Converse with the operator about the overspeed event.	Engine Load	Result: The operator confirms that the overspeed was caused by a sudden drop of engine load. Return to service. Result: The overspeed was not caused by a sudden drop of engine load. Proceed to Test Step 2.
2. Check for Proper Operation of the Turbocharger A. Check for any oil that may be leaking into the inlet air.	Turbocharger	Result: The turbocharger is not leaking oil into the inlet air. Proceed to Test Step 3. Result: The turbocharger is leaking oil into the inlet air. Repair: Repair or replace the turbocharger. If the problem is not resolved, proceed to Test Step 3.
3. Check the Quality of the Inlet Air A. Check for combustible gases in the surrounding atmosphere.	Air Quality	Result: The atmosphere has combustible gases. Repair: Do not operate the engine in an environment with combustible gases. 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).