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SERIES 50 DEFECTIVE BYPASS VALVE

To determine if a defective bypass valve is causing low oil pressure, perform the following: ‪

  1. Remove the oil filter adaptor; refer to Section .
  2. Inspect the oil filter adaptor; refer to Section .
    1. If no damage is found with the oil filter adaptor components. Reinstall the oil filter adaptor; refer to Section , check pressure relief valve; refer to Section .
    2. If damage is found with the oil filter adaptor components; refer to Section .

Oil Filter Adaptor Repair

Perform the following steps to repair the oil filter adaptor: ‪

  1. Disassemble the oil filter adaptor; refer to Section .
  2. Inspect oil filter adaptor, refer to Section .
  3. Assemble the oil filter adaptor; refer to Section .

    Note: Always replace the copper washer whenever the adaptor plug is removed.

  4. Install repaired oil filter adaptor; refer to Section .
  5. Verify repairs made to the oil filter adaptor; refer to Section .
Test Engine with Repaired Oil Filter Adaptor

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 vary the engine speed between 1800 -2100 r/min.
  3. Visually examine the DDR for oil pressure reading.
    1. If the DDR indicates 241 kPa (35 lb/in.2 ), 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 ), shut down the engine and disconnect the DDR, check pressure relief valve; refer to Section .