GM Service Manual Online
For 1990-2009 cars only

Water Pump Replacement LY7, LLT

Special Tools

EN 46104 Water Pump Pulley Holding Tool

Removal Procedure

  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Remove the generator drive belt. Refer to Water Pump and Generator Belt Replacement .

  3. Object Number: 1342893  Size: SH
  4. Use the EN 46104 (1) in order to retain the water pump pulley.

  5. Object Number: 902876  Size: SH
  6. Remove the water pump pulley bolts.
  7. Remove the water pump pulley.

  8. Object Number: 946142  Size: SH
  9. Remove the water pump bolts.
  10. Remove the water pump.
  11. Remove and DISCARD the water pump seal.
  12. Carefully clean the water pump sealing surfaces.

Installation Procedure


    Object Number: 946142  Size: SH
  1. Install a NEW water pump seal.
  2. Install the water pump.
  3. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the water pump bolts.
  5. Tighten
    Tighten the water pump bolts to 10 N·m (89 lb in).


    Object Number: 902876  Size: SH
  6. Install the water pump pulley and the water pump pulley bolts.

  7. Object Number: 1342893  Size: SH
  8. Use the EN 46104 (1) in order to retain the water pump pulley.
  9. Install the water pump pulley bolts.
  10. Tighten
    Tighten the water pump pulley bolts to 12 N·m (106 lb in).

  11. Install the generator drive belt. Refer to Water Pump and Generator Belt Replacement .
  12. Fill the cooling system. Refer to Cooling System Draining and Filling .