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Home >> GMC >> 2005 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 4.8L, 5.3L & 6.0L (Repair Instructions - 3 Of 3) >> Off-Vehicle Repair Instructions - Part 3 >> Water Pump Cleaning and Inspection

Water Pump Cleaning and Inspection

    Fig 1: View Of Water Pump, Gaskets & Bolts
    GM260121Courtesy 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:
    • 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, dripping, occurs with the engine running and the cooling system pressurized, replace the water pump.

    4. Fig 2: View Of Water Pump Pulley
    GM260124Courtesy of GENERAL MOTORS CORP.
  4. Inspect the water pump pulley for wear or damage in the belt tracking area.
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