Series 50 – Section 26.7 Restricted Oil Cooler

Section 26.7
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 "Typical Display Data Line Adaptor" ; 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°-96°C (190°-210°F).
   1. If the DDR is indicating a lubricating oil temperature less than or equal to 110°C (230°F), no further troubleshooting is required, check pressure regulator valve; refer to "26.8 Nonfunctional or Sticking Oil Pressure Regulator Valve" . Shut down the engine and disconnect the DDR.
   2. If the DDR is indicating a lubricating oil temperature greater than 110°C (230°F), repair oil cooler; refer to "26.7.1 Oil Cooler Repair" . Shut down the engine.

Section 26.7.1
Oil Cooler Repair

Perform the following steps to repair the oil cooler:‪

1. Remove and repair oil cooler; refer to "3.7.1 Repair or Replacement of Oil Cooler" .
2. Clean the oil cooler; refer to "3.7.2 Cleaning and Removal of Oil Cooler" .
3. Inspect the oil cooler for damage; refer to "3.7.2.1 Inspection of Oil Cooler" .
4. Install repaired oil cooler; refer to "3.7.3 Installation of Oil Cooler" .
5. Verify repair of oil cooler; refer to "26.7.1.1 Test Engine with Repaired Oil Cooler" .

Section 26.7.1.1
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°-96°C (190°-210°F).
   1. If the DDR is indicating a lubricating oil temperature less than or equal to 110°C (230°F) 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 110°C (230°F) at 1800 r/min, shut down the engine and disconnect the DDR. Check pressure regulator valve; refer to "26.8 Nonfunctional or Sticking Oil Pressure Regulator Valve" .