To determine if a leaking oil cooler core is causing excessive oil consumption, perform the
following:
1. Check for oil in the engine coolant or radiator.
[a] If oil is present in either the engine coolant or radiator; perform step 2
[b] If no oil is present in either the engine coolant or radiator, check for a defective air
compressor; refer to section 6.3.
2. Remove the oil cooler core and housing; refer to appropriate service manual, lubrication
system chapter.
3. Clean both the oil side and water side of oil cooler core; refer to appropriate service
manual, lubrication system chapter.
4. Perform an oil cooler core pressure test; refer to appropriate service manual, lubrication
system chapter.
5. Visually check to see if air bubbles are rising to the surface of the water within the
container.
[a] If air bubbles are present, refer to section 6.2.1.
[b] If no air bubbles are present, complete a lube oil consumption report, call the Detroit
Diesel Customer Support Center (313-592-5800) for a form.
6.2.1
Oil Cooler Core Replacement
Perform the following for oil cooler core replacement:
1. Remove and install a new oil cooler core; refer to appropriate service manual, lubrication
system chapter.
2. Verify replacement of oil cooler core; refer to section 6.2.1.1.
3. If there is oil in the cooling system flush the cooling system and replace the coolant filter.
Refer to the appropriate service manual.
6.2.1.1
Test Engine with New Oil Cooler Core
Perform the following steps to determine if the replaced oil cooler core reduced oil consumption:
1. Start and run the engine to operating temperature 88°C (190°F).
2. Shut down the engine.
3. Check the engine coolant for the presence of oil.
[a] If no oil is present in the coolant, perform an lube oil consumption test report;
refer to section 6.2.1.2.
[b] If oil is present in the coolant, repeat section 6.2.1.
6.2.1.2
Test Engine for Reduced Oil Consumption
Perform a lube oil consumption report as follows:,
1. Call the Detroit Diesel Customer Support Center (313–592–5800) for a form.
2. Review the oil consumption report.
[a] If the oil consumption report data is within specifications, check for defective air
compressor. Refer to section 6.3.
[b] If the oil consumption report data is not within specifications, no further
troubleshooting is required.
