MBE 4000 DDEC VI Troubleshooting – Section 8.3 Defective Turbocharger

Section 8.3
Defective Turbocharger

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

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.‪

1. Remove the turbocharger drain line connected to the crankcase and place the drain line into a suitable container; refer to the MBE 4000 Service Manual (6SE420), Chapter 6, “Air Intake System — Turbocharger”.
2. Perform a crankcase pressure test; refer to "2.1 Crankcase Pressure Test" .
   1. If the engine crankcase pressure is less than 0.62 kPa (2.5 in. H₂ O), replace the turbocharger; refer to the MBE 4000 Service Manual (6SE420), Chapter 6, “Air Intake System — Turbocharger”. Shut down the engine.
   2. If the engine crankcase pressure indicates no change, check for a worn or damaged valve or cylinder kit;

Section 8.3.1
Turbocharger Replacement

Perform the following steps to replace a defective turbocharger:‪

1. Remove the defective turbocharger from the engine; refer to the MBE 4000 Service Manual (6SE420), Chapter 6, “Air Intake System — Turbocharger”.
2. Tag the removed turbocharger for remanufacture.
3. Install a replacement turbocharger to the engine; refer to the MBE 4000 Service Manual (6SE420) , Chapter 6, Air Intake System Chapter — Turbocharger.
4. Verify replacement of new turbocharger; refer to "8.3.1.1 Test Engine with New Turbocharger"

Section 8.3.1.1
Test Engine with New Turbocharger

To determine if a new turbocharger resolved the excessive crankcase pressure, perform a crankcase pressure test;refer to "2.1 Crankcase Pressure Test" .‪

1. If the engine crankcase pressure is 0.62 kPa (2.5 in. H₂ O) or less, no further troubleshooting is required. Shut down the engine.
2. If the engine crankcase pressure is greater than 0.62 kPa (2.5 in. H ₂ O), shut down the engine. Check for a worn or damaged valve or cylinder kit; refer to "8.4 Worn or Damaged Valve or Cylinder Kit"