Section 19.3 Leaking Oil Cooler Core

Section 19.3
Leaking Oil Cooler Core

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.
   1. If oil is present in either the engine coolant or radiator; refer to step 2 .
   2. If no oil is present in either the engine coolant or radiator, check for a defective air compressor; refer to "19.4 Defective Air Compressor" .
2. Remove the oil cooler core and housing; refer to "3.7.2 Cleaning and Removal of Oil Cooler" .
3. Clean both the oil side and water side of oil cooler core; refer to "3.7.2 Cleaning and Removal of Oil Cooler" .
4. Perform an oil cooler core pressure test; refer to "3.7.2.1 Inspection of Oil Cooler" .
5. Visually check to see if air bubbles are rising to the surface of the water within the container.
   1. If air bubbles are present; refer to "19.3.1 Oil Cooler Core Replacement" .
   2. If no air bubbles are present, complete lube oil consumption report; refer to "19.4 Defective Air Compressor" .

Section 19.3.1
Oil Cooler Core Replacement

Perform the following for oil cooler core replacement:‪

1. Replace and install a new oil cooler core; refer to "3.7.3 Installation of Oil Cooler" .
2. Verify replacement of oil cooler core; refer to "19.3.1.1 Test Engine with New Oil Cooler Core" .

Section 19.3.1.1
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.
   1. If no oil is present in the coolant, shut down the engine, no further troubleshooting is required.
   2. If oil is present in the coolant; refer to "19.3.1.2 Test Engine for Reduced Oil Consumption" .

Section 19.3.1.2
Test Engine for Reduced Oil Consumption

Perform a lube oil consumption report; refer to "29.5 Lube Oil Consumption Report" .‪

1. Review the oil consumption report.
   1. If the oil consumption report data is within specifications, check for defective air compressor. Refer to "19.4 Defective Air Compressor" .
   2. If the oil consumption report data is not within specifications, call Detroit Diesel Technical Service Group.