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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (Engine Mechanical - 4.6L - 3 Of 4) >> Off-Vehicle Repair Instructions (2 Of 3) >> Water Pump Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Water Pump Hub
    GM1564169Courtesy 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 pulley (2)
    • Damage to the water pump bolt holes (3)
    3. Fig 2: Identifying Water Pump Shaft Weep Holes
    GM1564170Courtesy of GENERAL MOTORS CORP.
  3. Examine the water pump shaft weep holes (1, 2) in the water pump body for signs of leakage. If coolant leakage is evident, replace the water pump.
    4. Fig 3: View Of Interior Of Water Pump
    GM1564173Courtesy of GENERAL MOTORS CORP.
  4. Inspect the interior of the water pump for the following:
    • Damage to the water pump O-ring 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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