GM Service Manual Online
For 1990-2009 cars only

Water Pump Replacement LE5

Tools Required

J 43651 Water Pump Holding Tool

Removal Procedure


    Object Number: 896331  Size: SH
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  2. Remove the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement .
  3. Remove the water pump access plate from the front cover.

  4. Object Number: 964352  Size: SH

    Important: A drain plug has been provided at the bottom of the water pump assembly for additional coolant drainage from the engine block and water pump.

  5. Drain the coolant from the water pump using the plug at the bottom of the pump.

  6. Object Number: 789912  Size: SH

    Important: The water pump holding tool supports the sprocket and chain during water pump service. The tool must be used or the balance shaft must be re-timed.

  7. Install the J 43651 into position.
  8. Tighten the bolts on the water pump holding tool into the threads on the water pump sprocket.
  9. Install the access cover bolts that were removed earlier to secure the water pump holding tool to the front cover assembly.
  10. Remove the 3 inner water pump sprocket to water pump blots.

  11. Object Number: 951420  Size: SH

    Important: Be sure to remove both water pump bolts from the front of the engine block.

  12. Remove the 2 water pump bolts.

  13. Object Number: 1578334  Size: SH
  14. Remove the rear 2 water pump bolts.

  15. Object Number: 951638  Size: SH
  16. Remove the water pump.
  17. Remove and discard the water pump O-ring seal.

Installation Procedure


    Object Number: 951802  Size: SH

    Important: Prior to installing the water pump, read the entire procedure. This will help avoid balance shaft chain re-timing and ensure proper sealing.

  1. Install a NEW water pump O-ring seal.
  2. Important: A guide pin can be created to aid in water pump alignment. Use a M 6 m x 6 mm stud. Thread the pin into the water pump sprocket.

  3. Using the guide pin, align the pin with the water pump holding tool.
  4. Position the water pump against the engine block and hand tighten the water pump bolts.
  5. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the inner water pump sprocket bolts. After 2 are snug, remove the guide pin and install the 3rd bolt.
  7. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  8. Tighten the water pump sprocket bolts last.
  9. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 789912  Size: SH
  10. Remove the J 43651 .

  11. Object Number: 896331  Size: SH
  12. Install the water pump access plate and bolts.
  13. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  14. Install the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement .
  15. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .

Water Pump Replacement LNF

Tools Required

J 43651 Water Pump Holding Tool

Removal Procedure


    Object Number: 1828008  Size: SH
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement.
  2. Remove the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement.
  3. Remove the water pump access plate from the front cover.

  4. Object Number: 964352  Size: SH

    Important: A drain plug has been provided at the bottom of the water pump assembly for additional coolant drainage from the engine block and water pump.

  5. Drain the coolant from the water pump using the plug at the bottom of the pump.

  6. Object Number: 1828010  Size: SH

    Important: The water pump holding tool supports the sprocket and chain during water pump service. The tool must be used or the balance shaft must be re-timed.

  7. Install the J 43651 (1) into position.
  8. Tighten the bolts on the water pump holding tool into the threads on the water pump sprocket.
  9. Install the access cover bolts that were removed earlier to secure the water pump holding tool to the front cover assembly.
  10. Remove the 3 inner water pump sprocket to water pump blots.

  11. Object Number: 951420  Size: SH

    Important: Be sure to remove both water pump bolts from the front of the engine block.

  12. Remove the 2 water pump bolts.

  13. Object Number: 1578334  Size: SH
  14. Remove the rear 2 water pump bolts.

  15. Object Number: 951638  Size: SH
  16. Remove the water pump.
  17. Remove and discard the water pump O-ring seal.

Installation Procedure


    Object Number: 951802  Size: SH

    Important: Prior to installing the water pump, read the entire procedure. This will help avoid balance shaft chain re-timing and ensure proper sealing.

  1. Install a NEW water pump O-ring seal.
  2. Important: A guide pin can be created to aid in water pump alignment. Use a M 6 m x 6 mm stud. Thread the pin into the water pump sprocket.

  3. Using the guide pin, align the pin with the water pump holding tool.
  4. Position the water pump against the engine block and hand tighten the water pump bolts.
  5. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the inner water pump sprocket bolts. After 2 are snug, remove the guide pin and install the 3rd bolt.
  7. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  8. Tighten the water pump sprocket bolts last.
  9. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1828010  Size: SH
  10. Remove the J 43651 (1) .

  11. Object Number: 896331  Size: SH
  12. Install the water pump access plate and bolts.
  13. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  14. Install the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement.
  15. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement.

Tools Required

J 43651 Water Pump Holding Tool

Removal Procedure


    Object Number: 1828008  Size: SH
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement.
  2. Remove the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement.
  3. Remove the water pump access plate from the front cover.

  4. Object Number: 964352  Size: SH

    Important: A drain plug has been provided at the bottom of the water pump assembly for additional coolant drainage from the engine block and water pump.

  5. Drain the coolant from the water pump using the plug at the bottom of the pump.

  6. Object Number: 1828010  Size: SH

    Important: The water pump holding tool supports the sprocket and chain during water pump service. The tool must be used or the balance shaft must be re-timed.

  7. Install the J 43651 (1) into position.
  8. Tighten the bolts on the water pump holding tool into the threads on the water pump sprocket.
  9. Install the access cover bolts that were removed earlier to secure the water pump holding tool to the front cover assembly.
  10. Remove the 3 inner water pump sprocket to water pump blots.

  11. Object Number: 951420  Size: SH

    Important: Be sure to remove both water pump bolts from the front of the engine block.

  12. Remove the 2 water pump bolts.

  13. Object Number: 1578334  Size: SH
  14. Remove the rear 2 water pump bolts.

  15. Object Number: 951638  Size: SH
  16. Remove the water pump.
  17. Remove and discard the water pump O-ring seal.

Installation Procedure


    Object Number: 951802  Size: SH

    Important: Prior to installing the water pump, read the entire procedure. This will help avoid balance shaft chain re-timing and ensure proper sealing.

  1. Install a NEW water pump O-ring seal.
  2. Important: A guide pin can be created to aid in water pump alignment. Use a M 6 m x 6 mm stud. Thread the pin into the water pump sprocket.

  3. Using the guide pin, align the pin with the water pump holding tool.
  4. Position the water pump against the engine block and hand tighten the water pump bolts.
  5. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the inner water pump sprocket bolts. After 2 are snug, remove the guide pin and install the 3rd bolt.
  7. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  8. Tighten the water pump sprocket bolts last.
  9. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1828010  Size: SH
  10. Remove the J 43651 (1) .

  11. Object Number: 896331  Size: SH
  12. Install the water pump access plate and bolts.
  13. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  14. Install the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement.
  15. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement.