MBE 4000 DDEC VI Troubleshooting – Section 10.3 Defective Turbocharger

Section 10.3
Defective Turbocharger

To determine if a defective turbocharger is causing excessive blue exhaust smoke, perform the following:‪

1. Remove the charge air cooler inlet duct connected between the turbocharger and charge air cooler.
2. Visually inspect the compressor inlet side of the turbocharger.
   1. If excessive engine lube oil is present, replace the turbocharger, refer to MBE 4000 Service Manual (6SE420), Chapter 6, “Air Intake System”.
   2. Verify replacing the turbocharger corrected the excessive blue smoke concern;refer to "10.3.1 Test Engine with Replaced Turbocharger" .

Section 10.3.1
Test Engine with Replaced Turbocharger

Perform the following steps to determine if a replaced turbocharger has resolved the excessive blue exhaust smoke condition:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Start and run the engine.
2. Run the engine at idle speed with a no-load condition for approximately five minutes, allowing the engine coolant to reach normal operating range, approximately 88-96°C (190-205°F).
3. Visually inspect the exhaust for excessive blue smoke.
   1. If the engine exhaust smoke emission appears normal, no further troubleshooting is required. Shut down the engine.
   2. If the engine exhaust smoke is excessively blue, shut down the engine. Check for worn or damaged valves or cylinder kit; refer to "10.4 Worn or Damaged Intake/Exhaust Valve or Cylinder Kit" .