- Diagnostic codes
- Air inlet heater
- Water temperature regulators
- Unit injectors
- Flash file
- Fuel supply
- Cooling system
- Component wear
Check for active diagnostic codes on the Caterpillar Electronic Technician (ET). Troubleshoot any active codes before continuing with this procedure.
Ensure that the air inlet heater is functioning properly. For additional information, refer to Troubleshooting, "Air Inlet Heater Circuit - Test".
Check the water temperature regulators for correct operation.
Use Cat ET to perform the cylinder cutout test. Try to simulate the conditions for the test that were experienced during operation. Cut out each cylinder individually for approximately one minute in order to isolate any misfiring cylinders. If the misfire can be isolated to a specific cylinder, proceed to Troubleshooting, "Injector Solenoid Circuit - Test".
Verify that the correct flash file is installed. The flash file that is installed in the ECM will be displayed on the "Configuration" screen on Cat ET.
- Monitor the exhaust for smoke while the engine is being cranked.
If no smoke is present, there may be a problem with the fuel quality or there may be a problem with the fuel supply.
- Check the fuel quality. Make sure that the fuel meets the requirements of Special Publication, SEBU6251, "Commercial Diesel Engine Fluids Recommendations ".
- Check the fuel pressure.
- Ensure that the fuel system has been primed.
- Check for fuel supply lines that are restricted.
- If the temperature is below 0 °C (32 °F), check for solidified fuel (wax).
- Check for air in the fuel system.
Check for an internal coolant leak. Check for coolant in the engine oil, coolant in the cylinders, and coolant in the exhaust system.
Check the following components for excessive wear:
- Valves
- Pistons
- Rings
- Cylinder liners