Turbocharger Cleaning and Inspection

Completely inspect the turbocharger and all other engine components that may cause similar conditions before replacing the turbocharger.

Use the following information to diagnose problems caused by the turbocharger.

The turbocharger is serviced as a complete unit.

Fig 1: View Of Oil Return Pipe Bolts
Courtesy of GENERAL MOTORS CORP.
NOTE: Oil residue on the turbocharger compressor wheel is normal with a closed PCV system.
1. Remove the turbocharger oil return pipe bolts.
2. Remove the turbocharger oil return pipe and gasket.
3. Clean mating surfaces.
Fig 2: View Of Compressor Wheel
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4. Inspect for damage to the compressor wheel, compared to a normal compressor wheel.
Fig 3: View Of Damaged Compressor Wheel (Soft Object)
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5. Inspect for damage to the compressor wheel, by a soft object.
Fig 4: View Of Damaged Compressor Wheel (Hard Object)
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6. Inspect for damage to the compressor wheel, by a hard object.
Fig 5: View Of Compressor Blades (Heavy Rubbing)
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7. Inspect compressor blades for heavy rubbing.

   Ensure that the following conditions do not exist on the compressor wheel blades:

   • Cracks
   • Bends
   • Erosion of the blades
   • Broken blades
8. Check the housing for signs of rubbing.
Fig 6: View Of Oil Return Pipe Bolts
Courtesy of GENERAL MOTORS CORP.
9. Install the turbocharger oil return pipe and new gasket.
CAUTION: Refer to Fastener Caution .
10. Install the turbocharger oil return pipe bolts and tighten to 21 N.m (15 lb ft).
11. Inspect the coolant outlet lines for damage.
Fig 7: View Of Turbocharger Inlet Duct Inspection Areas
Courtesy of GENERAL MOTORS CORP.
12. Clean the turbocharger inlet duct.
13. Clean the turbocharger inlet duct mating surfaces.
14. Inspect the turbocharger inlet duct for cracks.
15. Inspect the turbocharger inlet duct mating surfaces for damage.
16. Replace the turbocharger inlet duct if any damage is found.
17. Tighten the inlet duct clamp to 5 N.m (44 lb in).