DD15 General Check for Excessive Oil Consumption Troubleshooting

Check as follows:‪

  1. Check first for external oil leaks. Refer to “4.2 External Oil Leaks” . If no external leaks are found, go to the next step.
  2. Perform the compression test with DDDL 7.0 or higher.
    1. If compression test shows no cylinders with low compression, go to the next step.
    2. 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” .
  3. Check the exhaust S-pipe for and bellows for oil.
    1. If oil is found, go on to the next step.
    2. If no oil is found look for a different cause for oil consumption.
  4. Remove the turbo and inter stage duct and inspect for oil in the exhaust
    1. If oil is found in the inter stage duct and none is found in the manifold, go to step 5 .
    2. If oil is found in the exhaust manifold, go to step 6 .
    3. If no oil is found in the inter stage duct, go to step 7 .
  5. Inspect the turbo for damage.
    1. If the turbo is OK, check for air inlet restrictions.
    2. If the turbo appears to be defective, refer to “4.3 Defective Turbocharger” .
  6. Determine if the oil is coming from one cylinder or multiple cylinders.
    1. 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.
    2. 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.
  7. Check pressure output of the APT air solenoid.
    1. 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 (DDC-SVC-MAN-0002).
    2. If the air pressure is out of spec, change the air solenoid

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