38 RENR5042-02 Troubleshooting Section Fuel Supply i02214232 Engine Vibration 1. Check the fuel pressure. Refer to Systems Operation/Testing and Adjusting, “Fuel System” for the correct procedure. SMCS Code: 1000-035 2. Check the fuel lines for the following problems: restrictions, collapsed lines, and pinched lines. If problems are found with the fuel lines, repair the lines and/or replace the lines. Probable Causes Vibration damper 3. Check the fuel tank for foreign objects which may block the fuel supply. Engine supports Driven equipment 4. Check for air in the low pressure fuel supply system if any of the following procedures have been performed:
Engine misfiring or running rough Recommended Actions Replacement of the fuel filters Vibration Damper Service on the low pressure fuel supply circuit Check the vibration damper for damage. Install a new vibration damper, if necessary. Inspect the mounting bolts for damage and/or for wear. Replace any damaged bolts. Refer to the Disassembly and Assembly manual. Replacement of unit injectors Note: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel. Refer to Systems Operation/Testing and Adjusting, “Fuel System” for more information. Engine Supports NOTICE Do not crank the engine continuously for more than 30 seconds.
Allow the starting motor to cool for two minutes before cranking the engine again. Inspect the mounts and the brackets while you run the engine through the speed range. Look for mounts and brackets that are loose and/or broken. Tighten all of the mounting bolts. Install new components, if necessary. 5. Purge air from the low pressure fuel supply circuit. Refer to the Operation and Maintenance Manual, “Fuel System - Prime” for the correct procedure. Driven Equipment 6. 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.
Check the alignment and the balance of the driven equipment. Engine Misfiring or Running Rough Refer to Troubleshooting, “Engine Misfires, Runs Rough or Is Unstable”. 7. Check the fuel pressure after the fuel filter while the engine is being cranked. Refer to the Systems Operation/Testing and Adjusting manual 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. i02214238 Engine Will Not Crank SMCS Code:
1000-035 Probable Causes Accessory Equipment Batteries Check all accessory equipment for problems that may create excessive load on the engine. Repair any damaged components or replace any damaged components. Battery cables Starting circuit