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For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 LaCrosse 🢒 Preface 🢒 Cautions and Notices 🢒 Water Pump Replacement

Water Pump Replacement LY7

Tools Required

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 Drive Belt Replacement .

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

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

    6. Object Number: 946142 Size: SH
  6. Remove the water pump bolts.
  7. Remove the water pump.
  8. Remove and DISCARD the water pump seal.
  9. 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.

  3. Install the water pump bolts.

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


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

    5. Object Number: 1342893 Size: SH
  5. Use the EN 46104  (1) in order to retain the water pump pulley.
  6. Install the water pump pulley bolts.

    7. Tighten
    Tighten the water pump pulley bolts to 12 N·m (106 lb in).

  7. Install the generator drive belt. Refer to Drive Belt Replacement .
  8. Fill the cooling system. Refer to Cooling System Draining and Filling .

Water Pump Replacement RPOs L26/L32

Removal Procedure

    Object Number: 46174 Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Reposition the accessory wiring junction block.
  3. Loosen the water pump pulley bolts.
  4. Remove the drive belt. Refer to Drive Belt Replacement .
  5. Remove the water pump pulley bolts.
  6. Remove the water pump pulley.
  7. Remove the power steering pump mounting bolts and reposition. Refer to Power Steering Pump Replacement .

    8. Object Number: 46177 Size: SH
  8. Remove the water pump bolts.

    9. Object Number: 46178 Size: SH
  9. Remove the water pump.
  10. Remove the water pump gasket.
  11. Clean and inspect the water pump gasket mating surfaces.

Installation Procedure

    Object Number: 46178 Size: SH
  1. Install the gasket and the water pump.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Install the water pump bolts.

    3. Tighten

        • Tighten the long water pump bolts to 34 N·m (25 lb ft).
        • Tighten the short water pump bolts to 22 N·m (16 lb ft).

    Object Number: 46174 Size: SH
  3. Install the water pump pulley.
  4. Install the water pump pulley bolts.

    5. Tighten
    Tighten the bolts to 13 N·m (115 lb in).

  5. Install the power steering pump. Refer to Power Steering Pump Replacement .
  6. Install the drive belt. Refer to Drive Belt Replacement .
  7. Install the accessory wiring junction block.
  8. Fill the cooling system. Refer to Cooling System Draining and Filling .