GM Service Manual Online
For 1990-2009 cars only

Water Pump Replacement 8.1L Engine

Removal Procedure


    Object Number: 751427  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Remove the drive belt. Refer to Drive Belt Replacement - Accessory in Engine Mechanical - 8.1 L.
  3. Remove the fan clutch. Refer to Fan Clutch Replacement .
  4. Position the outlet hose clamp at the water pump.
  5. Remove the outlet hose from the water pump.

  6. Object Number: 846662  Size: SH
  7. Position the bypass hose clamps at the water pump and water crossover.
  8. Remove the bypass hose.

  9. Object Number: 470790  Size: SH
  10. Remove the water pump bolts.
  11. Remove the water pump.
  12. Remove and discard the water pump gaskets.

Installation Procedure


    Object Number: 470790  Size: SH
  1. Place NEW water pump gaskets into place.
  2. Install the water pump.
  3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the water pump bolts.
  5. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).


    Object Number: 846662  Size: SH
  6. Install the bypass hose.
  7. Position the bypass hose clamps at the water pump and water crossover.

  8. Object Number: 751427  Size: SH
  9. Install the outlet hose to the water pump.
  10. Position the outlet hose clamp at the water pump.
  11. Install the fan clutch. Refer to Fan Clutch Replacement .
  12. Install the drive belt. Refer to Drive Belt Replacement - Accessory in Engine Mechanical - 8.1 L.
  13. Fill the cooling system. Refer to Cooling System Draining and Filling .

Water Pump Replacement 4.8L, 5.3L, and 6.0L Engines

Removal Procedure


    Object Number: 832066  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Loosen the air cleaner outlet duct clamps at the following locations:
  3. • Throttle body
    • Mass air flow (MAF)/intake air temperature (IAT) sensor
  4. Remove the radiator inlet hose clip from the outlet duct.
  5. Remove the air cleaner outlet duct.

  6. Object Number: 659465  Size: SH
  7. If necessary, remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.
  8. Remove the radiator vent inlet hose from the radiator hose clips.

  9. Object Number: 846666  Size: SH
  10. Position the inlet hose clamp at the water pump.
  11. Remove the inlet hose from the water pump.
  12. Remove the accessory drive belt. Refer to Drive Belt Replacement - Accessory .

  13. Object Number: 846668  Size: SH
  14. Position the outlet hose clamp at the water pump.
  15. Remove the outlet hose from the water pump.

  16. Object Number: 659180  Size: SH
  17. Position the surge tank outlet hose clamp at the water pump.
  18. Remove the surge tank outlet hose from the water pump.

  19. Object Number: 660665  Size: SH
  20. Position the heater inlet hose clamp at the water pump.
  21. Remove the heater inlet hose from the water pump.

  22. Object Number: 260121  Size: SH
  23. Remove the water pump bolts.
  24. Remove the water pump and gaskets.
  25. Discard the water pump gaskets.

Installation Procedure

Important: All gaskets surfaces are to be free of oil or other foreign material during assembly.

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 260121  Size: SH
  1. Install the water pump and NEW gaskets.
  2. Install the water pump bolts.
  3. Tighten

    1. Tighten the bolts a first pass to 15 N·m (11 lb ft).
    2. Tighten the bolts a final pass to 30 N·m (22 lb ft).

    Object Number: 660665  Size: SH
  4. Install the heater inlet hose to the water pump.
  5. Position the heater inlet hose clamp at the water pump.

  6. Object Number: 659180  Size: SH
  7. Install the surge tank outlet hose to the water pump.
  8. Position the surge tank outlet hose clamp at the water pump.

  9. Object Number: 846668  Size: SH
  10. Install the outlet hose to the water pump.
  11. Position the outlet hose clamp at the water pump.
  12. Install the accessory drive belt. Refer to Drive Belt Replacement - Accessory .

  13. Object Number: 846666  Size: SH
  14. Install the inlet hose to the water pump.
  15. Position the inlet hose clamp at the water pump.

  16. Object Number: 659465  Size: SH
  17. Install the engine vent inlet hose to the radiator hose clips.
  18. If necessary, install the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.

  19. Object Number: 832066  Size: SH
  20. Install the air cleaner outlet duct.

  21. Object Number: 832068  Size: SH
  22. Align the arrow at the throttle body end of the duct with the throttle body attaching stud.
  23. Install the radiator inlet hose clip to the outlet duct.
  24. Tighten the air cleaner outlet duct clamps at the following locations:
  25. • Throttle body
    • MAF/IAT sensor

    Tighten
    Tighten the clamps to 4 N·m (32 lb in).

  26. Fill the cooling system. Refer to Cooling System Draining and Filling .