30 RENR5042-02 Troubleshooting Section Note: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel. Recommended Actions Engine Oil Cooler Core 5. Cold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation. 1. Check for leaks in the oil cooler core. If a leak is found, install a new oil cooler core. Refer to the Disassembly and Assembly manual. 6. Check the fuel pressure during engine cranking. Check the fuel pressure on the outlet side of the fuel filter. Refer to Specifications for 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. 2. Drain the crankcase and refill the crankcase with clean engine oil. Install new engine oil filters. Refer to the Operation and Maintenance Manual. Cylinder Head Gasket 1. Remove the cylinder head. Refer to the Disassembly and Assembly manual. Air Inlet and Exhaust System 2. Check the cylinder liner projection. Refer to the Testing and Adjusting manual. 1. Clean plugged air filters or replace plugged air filters. Refer to the Operation and Maintenance Manual. 3.
Install a new cylinder head gasket and new water seals in the spacer plate. Refer to the Disassembly and Assembly manual. 2. Check the air inlet and exhaust system for restrictions and/or leaks. Refer to Testing and Adjusting, “Air Inlet and Exhaust System”. Cylinder Head Check for cracks in the cylinder head. If a crack is found, repair the cylinder head and/or replace the cylinder head. Refer to the Disassembly and Assembly manual. 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. Cylinder Liner Check for cracked cylinder liners. Replace any cracked cylinder liners.
Refer to the Disassembly and Assembly manual. i02119298 Coolant in Engine Oil Cylinder Block SMCS Code: 1348-035; 1395-035 Inspect the cylinder block for cracks. If a crack is found, repair the cylinder block or replace the cylinder block. Probable Causes Engine oil cooler core Cylinder head gasket i02194394 Coolant Temperature Is Too High Cylinder head Cylinder liner SMCS Code: 1395-035 Cylinder block Refer to Systems Operation/Testing and Adjusting, “Cooling System - Check” for information on determining the cause of this condition.