Chevrolet Silverado / GMC Sierra. Service manual — part 593

Fig. 58: View Of Fuel Injector Nozzle Tip & Copper Washer Sealing Area
Courtesy of GENERAL MOTORS CORP.

1. Use a soft bristle non-metallic brush and top engine cleaner, GM P/N 1052626 or

equivalent, to remove any deposits from the nozzle tip (1) and the copper washer sealing
area (2) before reinstallation.

2008 Chevrolet Silverado 1500

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

2. Inspect the fuel injector nozzle tip (1) for cracks, dents, or other damage.

3. Inspect the nozzle tip (1) for any signs of discoloration - dark yellow, tan, or blue due to

excessive heat.

4. Replace the injector if any damage is found.

Fig. 59: View Of Fuel Injector Sealing Surfaces
Courtesy of GENERAL MOTORS CORP.

5. Clean the fuel injector high pressure line.

6. Inspect the fuel injector high pressure line for excessive corrosion or damage to the sealing

surfaces (1, 2). Replace the line if any damage is found.

TURBOCHARGER CLEANING AND INSPECTION

Completely inspect the turbocharger and all other engine components that may cause similar

NOTE:

The fuel injector must be cleaned with the proper cleaning
equipment. DO NOT use abrasive cleaning methods, such as a
metallic brush, to remove deposits. Cleaning an injector with
improper tools will damage the fuel injector.

2008 Chevrolet Silverado 1500

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

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

2008 Chevrolet Silverado 1500

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

1. Remove the turbocharger oil return pipe bolts.

2. Remove the turbocharger oil return pipe and gasket.

3. Clean mating surfaces.

Fig. 61: View Of Compressor Wheel
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Oil residue on the turbocharger compressor wheel is normal

with a closed PCV system.

2008 Chevrolet Silverado 1500

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