C 1500 Truck 2WD V6-4.3L VIN W (2001)
16. Remove the old gasket material from the water pump sealing surfaces.
17. Clean all the dirt and any debris from the water pump.
18. Inspect the water pump for the following:
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Leakage or damage to the housing cover or gasket (1)
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Excessive scratches or gouging to the gasket sealing surfaces (2)
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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.
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Damaged bolt hole threads (4)
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Excessive side-to-side movement of the water pump shaft (5)
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Leakage around the water inlet pipe (6)
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Leakage around the heater hose pipe (7)
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Restrictions within the internal coolant passages
Installation Procedure
1. If reusing the fasteners, apply sealant GM P/N 12346004 or equivalent to the threads of the water pump bolts.
2. Install the water pump and the NEW water pump gaskets.
Notice: Refer to Fastener Notice in Service Precautions.
3. Install the water pump bolts.
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Tighten the water pump bolts to 45 Nm (33 ft. lbs.).