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SERIES 60 DEFECTIVE OIL PUMP ASSEMBLY

To determine if a defective oil pump is causing low oil pressure, perform the following steps: ‪

  1. Remove the oil pump assembly; refer to section .
  2. Manually rotate the oil pump drive gear.
    1. If the drive gear rotates freely in the pump housing, call Detroit Diesel Technical Service Group.
    2. If the drive gear did not rotate freely; refer to section .

Oil Pump Assembly Repair

Perform the following steps to repair the oil pump assembly: ‪

  1. Disassemble the oil pump assembly and replace worn or damaged components as required; refer to section .
  2. Reassemble the oil pump; refer to section or refer to section for pre-1991 oil pump.
  3. Verify oil pump repair; refer to section .
Test Engine with Repaired Oil Pump Assembly

Perform the following steps to determine if repaired relief valve resolved low oil pressure: ‪

  1. Install the Diagnostic Data Reader to the vehicles Display Data Line Adaptor, see Figure 24089 ; refer to OEM guidelines.
  2. Start and run the engine speed at 1800 r/min.
  3. Visually examine the DDR for oil pressure reading.
    1. If the DDR indicates 241 kPa (35 lb/in.2 ) at 1800 r/min, shut down the engine and disconnect the DDR. No further troubleshooting is required.
    2. If the DDR indicates less than 241 kPa (35 lb/in.2 ) at 1800 r/min, shut down the engine and disconnect the DDR; call Detroit Diesel Technical Service Group.