Chevrolet Silverado / GMC Sierra. Service manual — part 591

ENGINE COOLANT THERMOSTAT HOUSING CLEANING AND INSPECTION

Fig. 50: View Of Thermostat Housing Inspection Areas
Courtesy of GENERAL MOTORS CORP.

1. Clean the thermostat housing.

2. Clean the thermostat housing mating surfaces.

3. Inspect the thermostat housing for cracks.

4. Inspect the thermostat housing mating surfaces for damage.

5. Replace the thermostat housing if any damage is found.

EXHAUST MANIFOLD CLEANING AND INSPECTION

2008 Chevrolet Silverado 1500

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

Fig. 51: View Of Exhaust Manifold Inspection Areas
Courtesy of GENERAL MOTORS CORP.

1. Clean the exhaust manifold.

2. Clean the exhaust manifold mating surfaces.

3. Inspect the exhaust manifold for cracks.

4. Inspect the exhaust manifold mating surfaces for damage.

5. Replace the exhaust manifold if any damage is found.

2008 Chevrolet Silverado 1500

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

Fig. 52: Measuring Exhaust Manifold Flange For Warpage
Courtesy of GENERAL MOTORS CORP.

6. Measure the exhaust manifold flange for warpage with feeler gauge and a straightedge.

Replace the exhaust manifold if the warpage is more than 0.3 mm (0.0118 in).

7. Install the exhaust manifold heat shield.

8. Install the exhaust manifold heat shield bolts.

Tighten: Tighten the exhaust manifold heat shield bolts to 8 N.m (71 lb in).

EXHAUST PIPE CLEANING AND INSPECTION

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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

Fig. 53: View Of Exhaust Pipe Inspection Areas
Courtesy of GENERAL MOTORS CORP.

1. Clean the exhaust pipe.

2. Clean the exhaust pipe mating surfaces.

3. Inspect the exhaust pipe for dents or cracks.

4. Replace the exhaust pipe if any damage is found.

EXHAUST OUTLET CLEANING AND INSPECTION

2008 Chevrolet Silverado 1500

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