Skip to main content

SERIES 50 RESTRICTED OIL COOLER

To determine if a restricted oil cooler is causing low oil pressure, perform the following: ‪

  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 at 1800 r/min.
  3. Run the engine at 1800 r/min with a no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range, 88-96C (190-210F).
    1. If the DDR is indicating a lubricating oil temperature less than or equal to 110C (230F), no further troubleshooting is required, check pressure regulator valve; refer to Section . Shut down the engine and disconnect the DDR.
    2. If the DDR is indicating a lubricating oil temperature greater than 110C (230F), repair oil cooler; refer to Section . Shut down the engine.

Oil Cooler Repair

Perform the following steps to repair the oil cooler: ‪

  1. Remove and repair oil cooler; refer to Section .
  2. Clean the oil cooler; refer to Section .
  3. Inspect the oil cooler for damage; refer to Section .
  4. Install repaired oil cooler; refer to Section .
  5. Verify repair of oil cooler; refer to Section .
Test Engine with Repaired Oil Cooler

Perform the following to determine if oil cooler repair resolved low oil pressure: ‪

  1. Start and run the engine at 1800 r/min.
  2. Run the engine through its operating range with no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range, 88-96C (190-210F).
    1. If the DDR is indicating a lubricating oil temperature less than or equal to 110C (230F) at 1800 r/min, disconnect the DDR and shut down the engine. No further troubleshooting is required.
    2. If the DDR is indicating a lubricating oil temperature greater than 110C (230F) at 1800 r/min, shut down the engine and disconnect the DDR. Check pressure regulator valve; refer to Section .