Series 50 – Section 26.8 Nonfunctional or Sticking Oil Pressure Regulator Valve

Section 26.8
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 "3.3.2 Draining and Removal of Oil Pressure Regulator Valve" in 6SE450 service manual.
2. Inspect the oil pressure regulator; refer to "3.3.3.1 Inspection of Oil Pressure Regulator Valve" .
   1. If the regulator valve moves freely in the valve body, no further troubleshooting is required; see Figure "Oil Pressure Regulator" . Reinstall the oil pressure regulator assembly; refer to "3.3.5 Installation of Oil Pressure Regulator Valve" , check the bypass valve; refer to "26.9 Defective Bypass Valve" .
   2. If the regulator valve will not move freely in the valve body, refer to "26.8.1 Oil Pressure Regulator Valve Repair" .
   

   1. Pin‪	5. Valve‪
   2. Pressure Relief Valve Pin Location‪	6. Spring‪
   3. Pressure Regulator Pin Location‪	7. Spring Seat‪
   4. Valve Body‪	‪

   Figure 1. Oil Pressure Regulator

Section 26.8.1
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 "3.3.3 Disassembly of Oil Pressure Regulator Valve" .
2. Assemble the pressure regulator valve; refer to "3.3.4 Assembly of Oil Pressure Regulator Valve" .
3. Verify repair of the regulator valve; refer to "26.8.1.1 Test Engine with Repaired Oil Pressure Regulator Valve" .

Section 26.8.1.1
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 "Typical Display Data Line Adaptor" ; 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 "26.9 Defective Bypass Valve" .