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).
[a] 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 section 2.7.
[b] 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 section 2.6.1.
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 section 2.6.1.1.
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.
2.3.Refer to section1.3 for the exhaust caution before proceeding. Start and run the engine at
1800 rpm.
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).
[a] 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.
[b] 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 section 2.7.
