Chevrolet Silverado / GMC Sierra. Manual — part 180
lb in).
2. Tighten the accelerator control cable bracket nuts to 12 N.m (106 lb in).
3. Tighten the accelerator control cable bracket stud to the throttle body to 12 N.m (106
lb in).
EXHAUST MANIFOLD CLEANING AND INSPECTION
Fig. 600: Exhaust Manifold Inspection Areas
Courtesy of GENERAL MOTORS CORP.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
1. Clean the exhaust manifolds in cleaning solvent.
2. Dry the components with compressed air.
3. Inspect the exhaust manifolds for the following:
Damage to the gasket sealing surfaces (1)
Damage to the threaded holes (2)
Restrictions within exhaust passages
Broken or damaged exhaust manifold heat shields (3), if applicable
Broken or damaged exhaust manifold
Fig. 601: Measuring Exhaust Manifold Flanges Alignment
Courtesy of GENERAL MOTORS CORP.
4. Measure the alignment or surface flatness of the exhaust manifold flanges using a straight
CAUTION: Refer to Safety Glasses Caution .
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
edge and a feeler gage. Refer to Engine Mechanical Specifications.
If the surface flatness is not within the specifications, the exhaust manifold is warped and
must be replaced.
WATER PUMP CLEANING AND INSPECTION
Fig. 602: Water Pump Inspection Areas
Courtesy of GENERAL MOTORS CORP.
CAUTION: Refer to SAFETY GLASSES CAUTION .
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
1. Remove the old gasket material from the water pump sealing surfaces.
2. Clean all the dirt and any debris from the water pump.
3. Inspect the water pump for the following:
Leakage or damage to the housing cover or gasket (1)
Excessive scratches or gouging to the gasket sealing surfaces (2)
Leakage from the water pump vent hole (3)
A stain around the vent hole is acceptable. If leakage occurred (dripping) with the
engine operating and the cooling system pressurized, then replace the water pump.
Damaged bolt hole threads (4)
Excessive side-to-side movement of the water pump shaft (5)
Leakage around the water inlet pipe (6)
Leakage around the heater hose pipe (7)
Restrictions within the internal coolant passages
THREAD REPAIR
General purpose thread repair kits are available commercially.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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