Chevrolet Silverado / GMC Sierra. Service manual — part 594

4. Inspect for damage to the compressor wheel, compared to a normal compressor wheel.

Fig. 62: View Of Damaged Compressor Wheel (Soft Object)
Courtesy of GENERAL MOTORS CORP.

5. Inspect for damage to the compressor wheel, by a soft object.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 63: View Of Damaged Compressor Wheel (Hard Object)
Courtesy of GENERAL MOTORS CORP.

6. Inspect for damage to the compressor wheel, by a hard object.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 64: View Of Compressor Blades (Heavy Rubbing)
Courtesy of GENERAL MOTORS CORP.

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

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Broken blades

8. Check the housing for signs of rubbing.

Fig. 65: View Of Oil Return Pipe Bolts
Courtesy of GENERAL MOTORS CORP.

9. Install the turbocharger oil return pipe and new gasket.

10. Install the turbocharger oil return pipe bolts.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado