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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Mechanical - 3.6L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Water Pump Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

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    Fig 1: Inspecting Water Pump & Hub
    GM1211126Courtesy of GENERAL MOTORS CORP.
  1. Rotate the water pump hub (1). The water pump hub and impeller should turn straight and smoothly. If the hub wobbles, is noisy, or feels rough when rotated, replace the water pump.
  2. Inspect the exterior of the water pump for the following:
    • Damage to the water pump hub bolt threads (2) for the water pump pulley
    • Damage to the water pump bolt holes (3)
    3. Fig 2: Checking Water Pump Shaft & Weep Hole For Leakage
    GM1318423Courtesy of GENERAL MOTORS CORP.
  3. Examine the water pump shaft (1) and the weep hole reservoir (2) in the water pump body for signs of leakage. If coolant leakage is evident, replace the water pump.
    4. Fig 3: Inspecting Interior Of Water Pump For Damage
    GM1211128Courtesy of GENERAL MOTORS CORP.
  4. Inspect the interior of the water pump for the following:
    • Damage to the water pump gasket sealing surface (1)
    • Damage, corrosion or restrictions to the water pump impeller (2)
    • Damage, corrosion or restrictions to the coolant passages (3)
  5. Repair or replace the water pump as necessary.
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