Chevrolet Silverado / GMC Sierra. Manual — part 2152
1. Clean the exhaust manifold (600) and heat shield (603) in solvent.
2. Dry the exhaust manifold with compressed air.
3. Inspect the exhaust manifold-to-cylinder head gasket surface for excessive scratches or
gouging.
4. Inspect for a loose, damaged, or cracked heat shield (603).
5. Inspect the studs (605) for damaged threads.
Fig. 131: Measuring Exhaust Manifold To Cylinder Head Surface For Warpage
Courtesy of GENERAL MOTORS CORP.
6. Use a straight edge and a feeler gage and measure the exhaust manifold cylinder head deck
for warpage.
CAUTION: Refer to Safety Glasses Caution .
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
An exhaust manifold deck with warpage in excess of 0.25 mm (0.01 in) within the 2 front or
2 rear runners or 0.5 mm (0.02 in) overall, may cause an exhaust leak and may affect OBD
II system performance. Exhaust manifolds not within specifications must be replaced.
ENGINE COOLANT AIR BLEED PIPE AND HOLE COVER CLEANING AND INSPECTION
Fig. 132: View Of Coolant Air Bleed Pipe Seal
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Do not use the engine coolant air bleed pipe and cover seals
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
1. Remove the seals (308) from the pipe and covers.
Fig. 133: View Of Coolant Air Bleed Pipe Components
Courtesy of GENERAL MOTORS CORP.
2. Clean the pipe and covers in solvent.
again. Upon installation of the pipe and covers, install NEW
seals.
CAUTION: Refer to Safety Glasses and Compressed Air Caution .
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
3. Dry the pipe and covers with compressed air.
4. Inspect the pipe and covers for restrictions within the pipe (1) or damaged sealing surfaces
(2, 3).
WATER PUMP CLEANING AND INSPECTION
Fig. 134: View Of Water Pump
Courtesy of GENERAL MOTORS CORP.
1. Remove the old gasket from the water pump sealing surfaces. Refer to Replacing Engine
Gaskets .
2. Clean all excess dirt and debris from the water pump housing.
3. Inspect the water pump for the following conditions:
Gasket and hose sealing surfaces for excessive scratches or gouging
Restrictions within the internal coolant passages
Excessive side-to-side play in the pulley shaft
Leakage at the water inlet housing or rear cover
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
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