Section 2.6
Restricted Oil Cooler

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

1. Connect to DDDL 7.0.
2. Start and run the engine at 1800 rpm.
3. Run the engine at 1800 rpm 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 DDDL 7.0 is indicating a lubricating oil temperature less than or equal to 110°C (230°F). Shut down the engine, disconnect DDDL 7.0, and check pressure regulator valve; refer to "2.7 Nonfunctional or Sticking Oil Pressure Regulator Valve" .
   2. If DDDL 7.0 is indicating a lubricating oil temperature greater than 110°C (230°F). Shut down the engine and repair oil cooler; refer to "2.6.1 Oil Cooler Repair" .

Section 2.6.1
Oil Cooler Repair

Perform the following steps to repair the oil cooler:‪

1. Remove and repair oil cooler, refer to appropriate service manual, lubrication system chapter.
2. Clean the oil cooler; refer to appropriate service manual, lubrication system chapter.
3. Inspect the oil cooler for damage; refer to appropriate service manual, lubrication system chapter.
4. Install repaired oil cooler; refer to appropriate service manual, lubrication system chapter.
5. Verify repair of oil cooler; refer to "2.6.1.1 Test Engine with Repaired Oil Cooler" .

Section 2.6.1.1
Test Engine with Repaired Oil Cooler

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

1. Connect to DDDL 7.0.
2. Refer to "1.3 Safety Precautions" for the exhaust caution before proceeding. Start and run the engine at 1800 rpm.
3. 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 DDDL 7.0 is indicating a lubricating oil temperature less than or equal to 110°C (230°F) at 1800 rpm, disconnect DDDL 7.0 and shut down the engine. No further troubleshooting is required.
   2. If DDDL 7.0 is indicating a lubricating oil temperature greater than 110°C (230°F) at 1800 rpm, shut down the engine and disconnect DDDL 7.0. Check pressure regulator valve; refer to "2.7 Nonfunctional or Sticking Oil Pressure Regulator Valve" .