GM Service Manual Online
For 1990-2009 cars only

Water Pump Replacement LL8

Tool Required

J 41240 Fan Clutch Remover and Installer

Removal Procedure

  1. Drain the coolant. Refer to Cooling System Draining and Filling .
  2. Remove the fan and shroud. Refer to Cooling Fan and Shroud Replacement .
  3. Remove the drive belt. Refer to Drive Belt Replacement .

  4. Object Number: 748318  Size: SH
  5. Using the J 41240 , secure the water pump pulley and remove the water pump pulley bolts.
  6. Remove the J 41240 .
  7. Remove the water pump pulley.

  8. Object Number: 637645  Size: SH
  9. Loosen and remove the water pump bolts.
  10. Remove the water pump.
  11. Clean and inspect the water pump. Refer to Water Pump Cleaning and Inspection .
  12. Discard and replace the gasket.

Installation Procedure

  1. Install a new water pump gasket.
  2. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 637645  Size: SH
  3. Install the water pump and secure the water pump with the bolts.
  4. Tighten

        • On the initial pass, tighten the bolts to 4 N·m (35 lb in).
        • On the final pass, tighten the bolts to 10 N·m (89 lb in).

    Object Number: 748318  Size: SH
  5. Install the water pump pulley.
  6. Install the water pump pulley bolts.
  7. Using the J 41240 , secure the water pump pulley while tightening the water pump pulley bolts.
  8. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  9. Remove the J 41240 .
  10. Install the drive belt. Refer to Drive Belt Replacement .
  11. Install the fan and the shroud. Refer to Cooling Fan and Shroud Replacement .
  12. Fill the cooling system with the specified coolant and concentration. Refer to Cooling System Draining and Filling .
  13. Inspect for leaks.