MBE 4000 DDEC VI Troubleshooting – Section 9.7 Defective Turbocharger

Section 9.7
Defective Turbocharger

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

1. Remove the turbocharger oil drain outlet line connected to the crankcase and place the drain line into a suitable container; refer to MBE 4000 Service Manual, (6SE420) Chapter 6, “Air Intake System”.
2. Rotate turbine wheel to check for free movement. If wheel does not move freely, replace turbocharger; refer to MBE 4000 Service Manual, (6SE420) Chapter 6, “Air Intake System”.
3. Verify that replacing the turbocharger corrected the excessive smoke problem; refer to "9.7.1 Test Engine with a Replaced Turbocharger" .
4. 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), shut down the engine and replace the turbocharger; refer to MBE 4000 Service Manual, (6SE420) Chapter 6, “Air Intake System”. Verify replaced turbocharger corrected the excessive smoke problem; refer to "9.7.1 Test Engine with a Replaced Turbocharger" .
   2. If the engine crankcase pressure is greater than 0.62 kPa (2.5 in. H₂ O), shut down the engine. Connect the oil drain outlet line to the turbocharger and call the Detroit Diesel Customer Support Center at 313-592-5800.

Section 9.7.1
Test Engine with a Replaced Turbocharger

Perform the following steps to determine if a replaced turbocharger has resolved the excessive 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 the engine.
2. Run the engine speed to full load.
3. Visually inspect the exhaust for excessive black or gray smoke.
   1. If the engine exhaust emission appears normal, no further troubleshooting is required. Shut down the engine.
   2. If the engine exhaust emission is excessive, shut down the engine, check for improper grade of fuel. Refer to "9.8 Improper Grade of Fuel" .