RENR5042-02 41 Troubleshooting Section Engine Oil Temperature Fuel Leaks Refer to Troubleshooting, “Engine Oil Temperature is Too High”. Check the fuel pressure during engine cranking. Check the fuel pressure after the fuel filter. Refer to Systems Operation/Testing and Adjusting, “Fuel System” for the correct pressure values. If the fuel pressure is low, replace the fuel filters. If the fuel pressure is still low, check the following items: fuel transfer pump, fuel transfer pump coupling, and fuel pressure regulating valve. Turbocharger Check the air inlet manifold for oil. If necessary, repair the turbocharger or replace the turbocharger.
Valve Guides Fuel Quality If the valve guides are worn, reconditioning of the cylinder head is required. Cold weather adversely affects the characteristics of the fuel. Refer to the applicable Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation. Piston Rings Inspect the internal engine components. Replace any worn components. Engine Speed/Timing i02253900 Excessive Fuel Consumption Calibrate the engine speed/timing sensors. Refer to Troubleshooting, “Engine Speed/Timing Sensor - Calibrate”. SMCS Code: 1250-035 Unit Injectors Probable Causes 1.
Check for correct installation of the J1/P1 and J2/P2 Electronic Control Module (ECM) connectors and the unit injector connectors. Refer to Troubleshooting, “Electrical Connectors - Inspect”. Engine operation Fuel leaks Fuel quality 2. Perform the “Injector Solenoid Test” on Cat ET in order to determine if all of the injector solenoids are being energized by the ECM. Engine speed/timing Unit injectors 3. Perform the “Cylinder Cutout Test” on Cat ET in order to identify any injectors that might be misfiring. Refer to Troubleshooting, “Injector Solenoid Circuit - Test” for the proper procedure.
Air inlet and exhaust system Accessory equipment Recommended Actions Air Inlet and Exhaust System Engine Operation 1. Inspect the air filter for a restriction. If the air filter shows signs of being plugged, clean the air filter or replace the air filter. Use the Caterpillar Electronic Technician (ET) to check the “Current Totals” for excessive idle time and/or for a high load factor which would be indicative of poor operating habits. 2. Check the air inlet and exhaust system for restrictions and/or for leaks. Refer to Systems Operation/Testing and Adjusting, “Air Inlet and Exhaust System”. Note: Engine operation may also be affected by environmental conditions such as wind and snow.
Accessory Equipment Check all accessory equipment for problems that may create excessive load on the engine. Repair any damaged components or replace any damaged components.