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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 427 (Engine Mechanical - 4.8L, 5.3L, & 6.0L (Unit Repair)) >> Repair Instructions >> Water Pump Cleaning and Inspection

Water Pump Cleaning and Inspection

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  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:
    • 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 outlet housing or rear cover gasket
    • Leakage at the water pump vent hole

      A stain around the vent hole is acceptable. If leakage occurs (dripping) with the engine running and the cooling system pressurized, replace the water pump.

    Fig 1: Water Pump & Gaskets
    G01674841Courtesy of GENERAL MOTORS CORP.
  4. Inspect the water pump pulley for wear or damage in the belt tracking area.
    Fig 2: Water Pump Pulley
    G01674842Courtesy of GENERAL MOTORS CORP.
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