To determine if a defective turbocharger is causing excessive exhaust smoke, perform the
1. Remove the exhaust pipe from the turbine outlet and remove the air intake pipe from
the compressor inlet.
2. Visually inspect the turbine and compressor wheels for missing blades or blade damage.
3. Inspect the turbine and compressor wheels for heavy deposits of dirt, coke or carbon.
4. Using a flashlight, check the wheels and housings for signs of rubbing.
5. Rotate the turbine wheel to check for freedom of movement.
6. Replace the turbocharger if there is any visible damage. refer to appropriate service
manual, air intake system chapter.
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 new turbocharger to the engine; refer to appropriate service manual, air intake
4. Verify replacement of new turbocharger; refer to section 188.8.131.52.
Test Engine with Replaced Turbocharger
Perform the following steps to determine if a replaced turbocharger resolved the excessive
exhaust smoke condition:
1. Start the engine.
2. Run the engine speed to full load.
3. Visually inspect the exhaust for excessive smoke.
[a] If the engine exhaust emission appears normal, no further troubleshooting is required.
Shut down the engine.
[b] If the engine exhaust emission is excessive, shut down the engine. Call Detroit Diesel
Customer Support Center (313-592-5800).