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SERIES 50 NONFUNCTIONAL OR STICKING OIL PRESSURE REGULATOR VALVE

To determine if a nonfunctional or sticking regulator valve is causing low oil pressure, perform the following: ‪

  1. Remove the oil pressure regulator; refer to Section in 6SE450 service manual.
  2. Inspect the oil pressure regulator; refer to Section .
    1. If the regulator valve moves freely in the valve body, no further troubleshooting is required; see Figure 20437 . Reinstall the oil pressure regulator assembly; refer to Section , check the bypass valve; refer to Section .
    2. If the regulator valve will not move freely in the valve body, refer to Section .
    3. 1. Pin ‪

      5. Valve ‪

      2. Pressure Relief Valve Pin Location ‪

      6. Spring ‪

      3. Pressure Regulator Pin Location ‪

      7. Spring Seat ‪

      4. Valve Body ‪

      Oil Pressure Regulator

Oil Pressure Regulator Valve Repair

Perform the following steps to repair the oil pressure regulator valve: ‪

  1. Disassemble the pressure regulator valve and replace damaged components; refer to Section .
  2. Assemble the pressure regulator valve; refer to Section .
  3. Verify repair of the regulator valve; refer to Section .
Test Engine with Repaired Oil Pressure Regulator Valve

Perform the following to determine if repaired oil pressure regulator 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 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; check bypass valve; refer to Section .