Section 6.4
Defective Turbocharger

To determine if a defective turbocharger is causing excessive oil consumption, perform the following: ‪

1. Remove the turbocharger drain line connected to the crankcase and place the drain line into a suitable container.

   NOTICE: ‪

   Ensure that the engine is not allowed to operate longer than necessary to perform the crankcase pressure test. A complete loss of crankcase oil will severely damage the engine.‪

2. Perform a crankcase pressure test. Refer to appropriate service manual, preventive maintenance chapter.
   1. If the engine crankcase pressure is less than 1.25 kPa (5 in. H₂ O), replace the turbocharger; refer to appropriate service manual, air intake system chapter.
   2. If the engine crankcase pressure is 1.25 kPa (5 in. H₂ O) or more, check for worn or damaged valve and cylinder kit; refer to "6.5 Worn or Damaged Valve or Cylinder Kit" .

Section 6.4.1
Turbocharger Replacement

Perform the following steps to replace a defective turbocharger:‪

1. Remove the defective turbocharger from the engine; refer to appropriate service manual, air intake system chapter.
2. Tag removed turbocharger for remanufacture.
3. Install a new turbocharger to the engine; refer to appropriate service manual, air intake system chapter.
4. Verify replacement of new turbocharger; refer to "6.4.1.1 Test Engine with New Turbocharger" .

Section 6.4.1.1
Test Engine with New Turbocharger

Perform the following steps to determine if a new turbocharger resolved the excessive crankcase pressure: ‪

1. Perform a crankcase pressure test. Refer to appropriate service manual, preventive maintenance chapter.
   1. If the engine crankcase pressure is greater than 1.25 kPa (5 in. H₂ O), check for worn or damaged valve or cylinder kit; refer to "6.5 Worn or Damaged Valve or Cylinder Kit" .
   2. If the engine crankcase pressure is 1.25 kPa (5 in. H₂ O) or less, no further troubleshooting is required.