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.
2.Perform a crankcase pressure test. Refer to appropriate service manual, preventive
maintenance chapter.
[a] If the engine crankcase pressure is less than 1.25 kPa (5 in. H2O), replace the turbocharger; refer to appropriate service manual, air intake system chapter.
[b] If the engine crankcase pressure is 1.25 kPa (5 in. H2O) or more, check for worn or damaged valve and cylinder kit; refer to section 6.5.
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 section 6.4.1.1.
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.
[a] If the engine crankcase pressure is greater than 1.25 kPa (5 in. H2O), check for worn or damaged valve or cylinder kit; refer to section 6.5.
[b] If the engine crankcase pressure is 1.25 kPa (5 in. H O) or less, no further 2troubleshooting is required.
