Series 50 – Section 20.3 Defective Turbocharger

Section 20.3
Defective Turbocharger

To determine if a defective turbocharger is causing excessive crankcase pressure, perform the following: ‪

1. Remove the turbocharger outlet line connected to the crankcase and place the drain line into a suitable container; refer to "6.5.2 Cleaning and Removal of Turbocharger" .
2. Perform a crankcase pressure test; refer to "29.3 Crankcase Pressure Test (Governed Speed No Load)" .
   1. If the engine crankcase pressure is less than 3 in. H₂ O (0.75 kPa), replace the turbocharger; refer to "20.3.1 Turbocharger Replacement" .
   2. If the engine crankcase pressure indicates no change, check for a worn or damaged valve or cylinder kit; refer to "20.4 Worn or Damaged Valve or Cylinder Kit" .

Section 20.3.1
Turbocharger Replacement

Perform the following steps to replace a defective turbocharger:‪

1. Remove defective turbocharger from the engine; refer to "6.5.2 Cleaning and Removal of Turbocharger" .
2. Tag removed turbocharger for remanufacture.
3. Install a replacement turbocharger to the engine; refer to "6.5.7 Installation of Turbocharger"
4. Verify replacement of new turbocharger; refer to "20.3.1.1 Test Engine with New Turbocharger" .

Section 20.3.1.1
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 "29.3 Crankcase Pressure Test (Governed Speed No Load)" .
   1. If the engine crankcase pressure is 3 in. H₂ O (0.75 kPa), no further troubleshooting is required. Shut the engine down.
   2. If the engine crankcase pressure is greater than 3 in. H₂ O (0.75 kPa), check for a worn or damaged valve or cylinder kit; refer to "20.4 Worn or Damaged Valve or Cylinder Kit" .