3512B and 3512C Petroleum Generator Set Engines Caterpillar

Engine Overspeeds

Usage:

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

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Table 1
Event Code
J1939 Code and Description	Conditions which Generate this Code	System Response
190-15 Engine Speed : High - least severe (1)	The engine rpm has exceeded the trip point for engine overspeed for the delay time.	The code is logged. The ECM may shut down the engine.
190-0 Engine Speed : High - most severe (3)		The code is logged. The ECM may shut down the engine.

Probable Causes

Turbocharger
Intake air and starting aids
Drop of load

Recommended Actions

Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Proper Operation of the Turbocharger A. Check for proper operation of the turbocharger. B. Check for any oil that may be leaking into the air inlet.	Turbocharger	Result: The turbocharger is leaking oil into the inlet. Repair: Repair or replace the turbocharger. Verify that the repair eliminated the problem. Result: The turbocharger is not leaking oil into the inlet. Proceed to Test Step 2.
2. Intake Air A. Check for combustible gases in the surrounding atmosphere. B. Check for proper operation of starting aids (if equipped).	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. Result: The atmosphere does not have combustible gases. Proceed to Test Step 4.
3. 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. Repair: Decrease the load on the engine gradually. 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).