76579 Mercury GASKET, FRONT COVER

Table 1
Event Code
Code and Description Conditions which Activate the Code System Response
361(1) High Engine Coolant Temperature The engine coolant temperature has exceeded the trip point for the programmed delay time. The code is logged.
The alarm output is activated.
361(2) High Engine Coolant Temperature The engine coolant temperature has exceeded the trip point for the programmed delay time. The code is logged.
The alarm output is activated.
The Electronic Control Module (ECM) initiates a request for a reduction of engine power to the operator panel.
361(3) High Engine Coolant Temperature The engine coolant temperature has exceeded the trip point for the programmed delay time. The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down. Probable Causes
High ambient temperature and/or high inlet air temperature
Low coolant level and/or coolant leakage
Insufficient flow of air or coolant through the radiator or heat exchanger
Faulty water temperature regulators
Coolant temperature sensor and/or circuit
Insufficient coolant flow through the engine
Excessive exhaust restriction
Excessive load on the engine
Incorrect base timing
Incorrect air/fuel ratioRecommended Actions
High Ambient Temperature and/or High Inlet Air Temperature
Determine if the ambient air temperature is within the design specifications for the cooling system.Check for high inlet air temperature. Refer to Troubleshooting, "Inlet Air Temperature Is High".Determine the cause of the high air temperature. Make corrections, when possible.Low Coolant Level and/or Coolant Leakage
Note: A low coolant level can be the effect of overheating rather than the cause.Check the coolant level.Run the engine to operating temperature. Inspect the cooling system for leaks.Determine whether the leak occurs before the engine overheats.Add coolant, if necessary. If leaking is found, perform the necessary repairs.Insufficient Flow of Air or Coolant Through the Radiator or Heat Exchanger
Radiator
Check the fins of the radiator for obstructions or debris. Check the fan for proper operation. Inspect the condition of the fan drive belts.If the radiator fins are obstructed, clean the fins. If the fan is not operating properly, perform the necessary repairs. Replace worn fan drive belts.Heat Exchanger
Check for sufficient flow and temperature of the cooling water through the heat exchanger. If the flow of cooling water through the heat exchanger is insufficient, determine the cause of the obstruction. If the temperature of the cooling water is too high, determine the cause of the high temperature. Perform the necessary repairs.Faulty Water Temperature Regulators
If the water temperature regulators are suspect, check for the proper operation of the temperature regulators. Inspect the condition of the seals for the temperature regulators. Refer to Systems Operation/Testing and Adjusting, "Testing the Cooling System". Replace the water temperature regulators and/or the seals, if necessary.Coolant Temperature Sensor and/or Circuit
Check the status for the engine coolant temperature with the Cat ET while the engine is warming to operating temperature. The temperature should rise steadily as the temperature of the engine rises. Ensure that the temperature is reasonable.If the reading on Cat ET for the engine coolant temperature is not reasonable, troubleshoot the circuit for the engine coolant temperature sensor. Refer to Troubleshooting, "Sensor Signal (Analog, Passive) - Test".Insufficient Coolant Flow through the Engine
During normal engine operation, use Cat ET to check the status of the engine coolant pressure. Check the status of the following parameters:
"Engine Coolant Pressure - Absolute"
"Engine Coolant Pump Pressure Status"If the engine coolant pressure is not sufficient, determine the cause of the problem. Refer to Systems Operation/Testing and Adjusting, "Testing the Cooling System". Perform the necessary repairs.Excessive Exhaust Restriction
Check the back pressure of the exhaust system. Refer to Systems Operation/Testing and Adjusting, "Restriction of Air Inlet and Exhaust".If the back pressure exceeds the specifications for the engine, determine the cause of the excessive back pressure. Make the necessary repairs.Excessive Load on the Engine
Confirm that the load on the engine is not excessive. If necessary, disengage the driven equipment and test the engine.Incorrect Base Timing
Engine timing that is retarded can affect exhaust temperatures and coolant temperatures of the engine.Verify that the timing is correct. Refer to Systems Operation/Testing and Adjusting, "Ignition Timing - Adjust" for the correct timing calibration procedure .Incorrect Air/Fuel Ratio
An air/fuel mixture that is too rich will cause engine overheating. Use a reliable exhaust analyzer to verify that the exhaust emissions are correct. Refer to Systems Operation/Testing and Adjusting, "Air/Fuel Ratio Control - Adjust" for the correct adjustment procedure.A change in the fuel energy content will change the air/fuel ratio. Obtain a fuel analysis.If the fuel analysis is as expected, inspect the NOX sensor port in the flower pot for plugging. If necessary, clean the port. If the problem persists, refer to Troubleshooting, "Detonation Occurrence".The fuel supply pressure must be 876 to 1289 mbar absolute or 12.705 to 18.695 PSI. The gas differential pressure (delta-p) should be between 69 and 345 mbar. Delta-p below this range is allowed during cranking and idle conditions, but accuracy of the valve will be reduced. For delta-p above 276 mbar, flow accuracy will also decrease, and a reduction in valve stability may occur. Minimum proof pressure for the fuel metering valve is 0.52 bar gauge. Minimum burst pressure for the fuel metering valve is 1.72 bar gauge.Strike the gas pressure regulator with a soft hammer. If the engine speed changes, inspect the internal parts of the gas pressure regulator for wear. Inspect the gas pressure regulator diaphragm for leaks. Ensure that the valve moves freely. The valve and the valve seat must be in good repair.Ensure that the fuel metering valve is operating correctly. Refer to Troubleshooting, "Fuel Metering Valve - Test" for details.