Probable Causes
- Failed turbocharger seals
- Worn valve guide seals or faulty valve guide seals
- Worn valve guides
- Worn piston rings
- Scored cylinder walls or worn cylinder walls
Recommended Repairs
Failed Turbocharger Seals
Check the inlet manifold and the exhaust manifold for oil. If oil is present, replace the turbocharger.
Worn Valve Guide Seals or Faulty Valve Guide Seals
Inspect the valve guide seals for wear and for damage. Replace the valve guide seals, if necessary.
Worn Valve Guides
Inspect the valve guides for wear. Refer to the Specification module for the maximum permissible wear of the valve guides. If necessary, recondition the cylinder head.
Worn Piston Rings
Piston rings that have excessive wear can cause too much pressure in the crankcase. The additional pressure in the crankcase will cause more than the normal amount of crankcase blowby from the crankcase breather. Use the 8T-2700 Blowby/Air Flow Indicator to check the amount of crankcase blowby. The test procedure is in Special Instruction, SEHS8712. Inspect piston rings and install new parts, as required.
Scored Cylinder Walls or Worn Cylinder Walls
Inspect the cylinder walls for damage. Hone the cylinder walls in order to remove the scoring. If necessary, bore the cylinder walls and install sleeves.