16.1 MECHANICAL TROUBLESHOOTING (Rev. 2007) All information subject to change without notice. 16-8 From Bulletin 1–MBE 4000–07 6SE412 0702 Copyright © 2007 DETROIT DIESEL CORPORATION Problem—There Is Coolant in the Engine Oil Cause Remedy The cylinder head gasket is damaged. Have an authorized dealer replace the head gasket. The oil/water heat exchanger is leaking. Have an authorized dealer replace the heat exchanger. There is an internal coolant leak. Bring the vehicle to an authorized dealer for service. Problem—There Is Foam in the Engine Oil Cause Remedy The oil level is too low or too high. Correct the oil level. The oil has not been changed within the recommended interval.
Change the oil. The oil is not of the recommended quality. Change the oil. Problem—The Engine Oil Pressure Is Low Cause Remedy The oil pressure gauge and/or sensor is not reading correctly. Bring the vehicle to an authorized dealer for service. There is fuel in the oil. Bring the vehicle to an authorized dealer for service. The oil filter is clogged. Replace the filter element. The oil filter bypass valve is damaged. Replace the bypass valve. The oil pump and/or relief valve is damaged. Have an authorized dealer replace the oil pump. Problem—The Engine Exhaust Is White Cause Remedy The fuel is of poor quality. Add fuel of the right quality. The intake air preheater is malfunctioning.
Check the intake air preheater, and replace it, if necessary. The valves are not adjusted properly. Check the valve lash.