Symptom
Coolant contaminated with lube oil will have oil in the deaeration tank.
Cause
• Oil cooler
Tools
• Oil cooler pressure test plate
• Air pressure regulator
Procedure
1. Verify if coolant is contaminated by inspecting deaeration tank for presence of oil.
2. Place a coolant drain pan under the oil system module.
3. Remove the coolant drain plug located at the bottom of the oil system module. Drain coolant
NOTE: Replace O-ring with a new O-ring when installing the coolant drain plug.
4. Remove the eight bolts (M8 x 20) securing the oil cooler to the oil cooler housing. Separate the oil cooler from the oil cooler housing.
5. Pressure test the oil cooler following the procedure in the Engine Service Manual. If a leak is noticed, replace the oil cooler.