To determine if a defective turbocharger is causing excessive crankcase pressure, perform the following:
1. Remove the turbocharger drain line connected to the crankcase and place the drain line into a suitable container; refer to appropriate service manual, air intake system chapter.
2. Perform a crankcase pressure test. Refer to appropriate service manual, preventive maintenance chapter. For crankcase pressure guidelines refer to Service Information Letter 02 TS-20 found on the DDC extranet.
[a] If the engine crankcase pressure is less than 1.25 kPa (5 in. H2 O), replace the turbocharger; refer to section 7.3.1. Shut down the engine.
[b] If the engine crankcase pressure indicates no change, check for a worn or damaged valve or cylinder kit; refer to section 7.4. Shut down the engine.
7.3.1
Turbocharger Replacement
Perform the following steps to replace a defective turbocharger:
1. Remove defective turbocharger from the engine; refer to appropriate service manual, air intake system chapter.
2. Tag removed turbocharger for remanufacture.
3. Install a replacement turbocharger to the engine; refer to appropriate service manual, air intake system chapter.
4. Verify replacement of new turbocharger; refer to section 7.3.1.1.
7.3.1.1
Test Engine with New Turbocharger
To determine if a new turbocharger resolved the excessive crankcase pressure, perform a crankcase
pressure test. Refer to appropriate service manual, preventive maintenance chapter. For crankcase
pressure guidelines refer to Service Information Letter 02 TS-20 found on the DDC extranet.
1.If the engine crankcase pressure is 1.25 kPa (5 in. H2O) or less, no further troubleshooting
is required.
2.If the engine crankcase pressure is greater than 1.25 kPa (5 in. H2O), check for a worn or
damaged valve or cylinder kit; refer to section 7.4.
