RENR5042-02 35 Troubleshooting Section Refer to the engine’s Systems Operation/Testing and Adjusting for more information on a particular problem. Low Oil Pressure When some components of the engine show bearing wear in a short time, the cause can be a restriction in a passage for engine oil. i02170800 Engine Has Early Wear An indicator for the engine oil pressure may indicate sufficient pressure, but a component is worn due to a lack of lubrication. In such a case, look at the passage for the engine oil supply to the component. Refer to Systems Operation/Testing and Adjusting, “Lubrication System” for additional information. SMCS Code:
1000-035 Probable Causes Incorrect engine oil Contaminated engine oil i02290324 Engine Misfires, Runs Rough or Is Unstable Contaminated air Contaminated fuel SMCS Code: 1000-035 Low oil pressure Note: If the symptom is intermittent and the symptom cannot be repeated, refer to Troubleshooting, “Intermittent Low Power or Power Cutout”. If the symptom is consistent and the symptom can be repeated, continue with this procedure. Recommended Actions Incorrect Engine Oil Use engine oil that is recommended and change the engine oil at the interval that is recommended by the engine’s Operation and Maintenance Manual.
Probable Causes Diagnostic codes Contaminated Engine Oil Programmable parameters Electrical connectors Drain the crankcase and refill the crankcase with clean engine oil. Install new engine oil filters. Refer to the engine’s Operation and Maintenance Manual for more information. Cold mode If the oil filter bypass valve is open, the oil will not be filtered. Check the oil filter bypass valve for a weak spring or for a broken spring. If the spring is broken, replace the spring. Refer to the engine’s Disassembly and Assembly manual. Make sure that the oil bypass valve is operating correctly.
Throttle signal Unit injectors Fuel supply Air inlet and exhaust system Contaminated Air Recommended Actions Inspect the air inlet system for leaks. Inspect all of the gaskets and the connections. Repair any leaks. Note: If the symptom only occurs under certain operating conditions (high idle, full load, engine operating temperature, etc), test the engine under those conditions. Troubleshooting the symptom under other conditions can give misleading results. Inspect the air filter. Replace the air filter, if necessary. Contaminated Fuel Inspect the fuel filter. Replace the fuel filter, if necessary.
Diagnostic Codes Check for active diagnostic codes on the Caterpillar Electronic Technician (ET). Troubleshoot any active codes before continuing with this procedure. Contaminants in the fuel such as hydrogen sulfide and sulfur can lead to the formation of acids in the crankcase. Obtain a fuel analysis. Programmable Parameters Check the following parameters on Cat ET: