General Check for Excessive Oil Consumption
Check as follows:
- Check first for external oil leaks. Refer to "4.2 External Oil Leaks"
. If no external leaks are found, go to the next step.
- Perform the compression test with DDDL 7.0 or higher.
- If compression test shows no cylinders with low compression, go to the next step.
- If compression test reveals a cylinder with low compression, inspect for a damaged cylinder kit. Refer to "4.5 Worn or Damaged Valve Guide/Seal or Cylinder Kit"
- Check the exhaust S-pipe for and bellows for oil.
- If oil is found, go on to the next step.
- If no oil is found look for a different cause for oil consumption.
- Remove the turbo and inter stage duct and inspect for oil in the exhaust
- If oil is found in the inter stage duct and none is found in the manifold, go to step 5
- If oil is found in the exhaust manifold, go to step 6
- If no oil is found in the inter stage duct, go to step 7
- Inspect the turbo for damage.
- If the turbo is OK, check for air inlet restrictions.
- If the turbo appears to be defective, refer to "4.3 Defective Turbocharger"
- Determine if the oil is coming from one cylinder or multiple cylinders.
- If it is coming out of a particular cylinder, check the valve guide seals for damage and check the valve stem and guide for wear.
- If it is coming from all six cylinders, look in the air inlet and CAC pipes for oil from the compressor side of the turbo.
- Check pressure output of the APT air solenoid.
- If the air pressure output is in spec, change the APT. Refer to "4.3.1 Removal of Axial Power Turbine"
in the “Air Intake System” chapter of the EPA07 DD15 Workshop Manual
- If the air pressure is out of spec, change the air solenoid