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Water Pump Replacement 6.6L

Removal Procedure


    Object Number: 1729415 Size: SH
  1. Remove the thermostat bypass pipes. Refer to Thermostat Bypass Pipes Replacement.
  2. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement.
  3. Remove the water pump to water pump outlet pipe nuts (2).

    4. Object Number: 1999392 Size: SH
  4. Remove the water pump nuts/bolts.

    5. Note the location of the bolts. The bolts are different lengths.

  5. Remove the water pump.
  6. Remove and discard the water pump O-ring and the water pump outlet pipe gasket.

Installation Procedure

    Object Number: 1999392 Size: SH
  1. Lubricate the water pump O-ring with engine oil.
  2. Install the water pump outlet pipe gasket and water pump O-ring.
  3. Install the water pump.

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

  4. Install the water pump nuts/bolts. Ensure the correct length bolt is used in the proper location.

    5. Tighten
    Tighten the nuts/bolts to 21 N·m (15 lb ft).


    Object Number: 1729415 Size: SH
  5. Install the water pump to water pump outlet pipe nuts (2).

    6. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).

  6. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement.
  7. Install the thermostat bypass pipes. Refer to Thermostat Bypass Pipes Replacement.

Water Pump Replacement LU3

Tools Required

J 41240 Fan Clutch Remover and Installer

Removal Procedure
  1. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  2. Remove the air cleaner outlet resonator duct. Refer to Air Cleaner Outlet Resonator Replacement .
  3. Drain the cooling system. Refer to Cooling System Draining and Filling .
  4. Remove the cooling fan.
  5. Remove the drive belt. Refer to Drive Belt Replacement .

    6. Object Number: 367001 Size: SH
  6. Reposition the radiator outlet hose clamps at the surge tank and water pump.
  7. Remove the radiator outlet hose from the surge tank.
  8. Remove the radiator outlet hose from the water pump.

    9. Object Number: 182853 Size: SH
  9. Reposition the water pump inlet hose clamps.
  10. Remove the water pump inlet hose.

    11. Object Number: 317191 Size: SH
  11. Using J 41240 to hold the water pump pulley, remove the water pump pulley bolts.

    12. Object Number: 188054 Size: SH
  12. Remove the water pump bolts.
  13. Remove the water pump.
  14. Remove and discard the water pump gaskets.
  15. Clean and inspect the water pump, if necessary. Refer to Water Pump Cleaning and Inspection .

Installation Procedure

    Object Number: 188054 Size: SH
  1. If reusing the fasteners, apply sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads of the water pump bolts.

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

  2. Install NEW water pump gaskets and the water pump.
  3. Install the water pump bolts.

    4. Tighten
    Tighten the water pump bolts to 45 N·m (33 lb ft).


    Object Number: 317191 Size: SH
  4. Using J 41240 to hold the water pump pulley, install the water pump pulley bolts.

    5. Tighten
    Tighten the water pump pulley bolts to 25 N·m (18 lb ft).


    Object Number: 182853 Size: SH

    Important: After assembly, the hose clamp tangs (water pump end) must point forward and the upper tang should be level with the outside diameter of the water pump inlet hose.

  5. Install the water pump inlet hose.
  6. Position the water pump inlet hose clamps.

    7. Object Number: 367001 Size: SH
  7. Install the radiator outlet hose to the water pump.
  8. Install the radiator outlet hose to the surge tank.
  9. Position the radiator outlet hose clamps at the surge tank and water pump.
  10. Install the drive belt. Refer to Drive Belt Replacement .
  11. Install the cooling fan.
  12. Install the air cleaner outlet resonator duct. Refer to Air Cleaner Outlet Resonator Replacement .
  13. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  14. Fill the cooling system. Refer to Cooling System Draining and Filling .
  15. Inspect the cooling system for leaks.

Water Pump Replacement LY6

Removal Procedure

    Object Number: 1699347 Size: SH
  1. Remove the air cleaner outlet assembly. Refer to Air Cleaner Assembly Replacement .
  2. Drain the cooling system. Refer to Cooling System Draining and Filling .
  3. Reposition the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
  4. Remove the radiator vent inlet hose (2) from the coolant air bleed pipe fitting.

    5. Object Number: 1696566 Size: SH
  5. Reposition the radiator inlet hose clamp (3) at the water pump.
  6. Remove the radiator inlet hose from the water pump.
  7. Reposition the radiator inlet hose and vent inlet hose out of the way.
  8. Remove the accessory drive belt. Refer to Drive Belt Replacement - Accessory .

    9. Object Number: 1699336 Size: SH
  9. Reposition the radiator outlet hose clamp at the water pump.
  10. Remove the radiator outlet hose from the water pump.
  11. Reposition the outlet hose out of the way.

    12. Object Number: 1697283 Size: SH
  12. Reposition the radiator surge tank outlet hose clamp at the water pump (1).
  13. Remove the radiator surge tank outlet hose (2) from the water pump.
  14. Reposition the outlet hose out of the way.

    15. Object Number: 1697282 Size: SH
  15. Reposition the heater inlet hose clamp (1) at the water pump.
  16. Remove the heater inlet hose (2) from the water pump.
  17. Reposition the inlet hose out of the way.

    18. Object Number: 1658143 Size: SH
  18. Remove the water pump bolts (301).
  19. Remove the water pump (300) and gaskets (309). Discard the gaskets.

Installation Procedure

Notice: DO NOT use cooling system seal tabs, or similar compounds, unless otherwise instructed. The use of cooling system seal tabs, or similar compounds, may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

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


    Object Number: 1658143 Size: SH
  1. Inspect the drained coolant for sand or other debris, flush the system as needed. Refer to Flushing .
  2. Inspect and clear the radiator vent hose fitting, if necessary.

    3. There is a small 2.0 mm (0.080 in) orifice (vent hose fitting) in the neck of the radiator where the coolant vent hose from the engine attaches to the radiator.

  3. Position the water pump (300) and NEW gaskets (306) to the engine block.

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

  4. Install the water pump bolts (301).

    5. 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: 1697282 Size: SH
  5. Position and install the heater inlet hose (2) to the water pump.
  6. Position the heater inlet hose clamp (1) at the water pump.

    7. Object Number: 1697283 Size: SH
  7. Position and install the radiator surge tank outlet hose (2) to the water pump.
  8. Position the radiator surge tank outlet hose clamp at the water pump (1).

    9. Object Number: 1699336 Size: SH
  9. Position and install the radiator outlet hose to the water pump.
  10. Position the radiator outlet hose clamp at the water pump.
  11. Install the accessory drive belt. Refer to Drive Belt Replacement - Accessory .

    12. Object Number: 1696566 Size: SH
  12. Position the radiator inlet hose and vent inlet hose to the correct position.
  13. Install the radiator inlet hose to the water pump.
  14. Position the radiator inlet hose clamp (3) at the water pump.

    15. Object Number: 1699347 Size: SH
  15. Install the radiator vent inlet hose (2) to the coolant air bleed pipe fitting.
  16. Position the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
  17. Fill the cooling system. Refer to Cooling System Draining and Filling .
  18. Install the air cleaner outlet assembly. Refer to Air Cleaner Assembly Replacement .

Water Pump Replacement LMF / LY2

Removal Procedure

    Object Number: 1699347 Size: SH
  1. Remove the air cleaner outlet assembly. Refer to Air Cleaner Assembly Replacement .
  2. Drain the cooling system. Refer to Cooling System Draining and Filling .
  3. Reposition the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
  4. Remove the radiator vent inlet hose (2) from the coolant air bleed pipe fitting.

    5. Object Number: 1696566 Size: SH
  5. Reposition the radiator inlet hose clamp (3) at the water pump.
  6. Remove the radiator inlet hose from the water pump.
  7. Reposition the radiator inlet hose and vent inlet hose out of the way.
  8. Remove the accessory drive belt. Refer to Drive Belt Replacement - Accessory .

    9. Object Number: 1699336 Size: SH
  9. Reposition the radiator outlet hose clamp at the water pump.
  10. Remove the radiator outlet hose from the water pump.
  11. Reposition the outlet hose out of the way.

    12. Object Number: 1697283 Size: SH
  12. Reposition the radiator surge tank outlet hose clamp (1) at the water pump.
  13. Remove the radiator surge tank outlet hose (2) from the water pump.
  14. Reposition the outlet hose out of the way.

    15. Object Number: 1697282 Size: SH
  15. Reposition the heater inlet hose clamp (1) at the water pump.
  16. Remove the heater inlet hose (2) from the water pump.
  17. Reposition the inlet hose out of the way.

    18. Object Number: 1658145 Size: SH
  18. Remove the water pump bolts (301).
  19. Remove the water pump (300) and gaskets (309). Discard the gaskets.

Installation Procedure

Notice: DO NOT use cooling system seal tabs, or similar compounds, unless otherwise instructed. The use of cooling system seal tabs, or similar compounds, may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

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


    Object Number: 1658145 Size: SH
  1. Position the water pump (300) and NEW gaskets (306) to the engine block.

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

  2. Install the water pump bolts (301).

    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: 1697282 Size: SH
  3. Position and install the heater inlet hose (2) to the water pump.
  4. Position the heater inlet hose clamp (1) at the water pump.

    5. Object Number: 1697283 Size: SH
  5. Position and install the radiator surge tank outlet hose (2) to the water pump.
  6. Position the radiator surge tank outlet hose clamp (1) at the water pump.

    7. Object Number: 1699336 Size: SH
  7. Position and install the radiator outlet hose to the water pump.
  8. Position the radiator outlet hose clamp at the water pump.
  9. Install the accessory drive belt. Refer to Drive Belt Replacement - Accessory .

    10. Object Number: 1696566 Size: SH
  10. Position the radiator inlet hose and vent inlet hose to the correct position.
  11. Install the radiator inlet hose to the water pump.
  12. Position the radiator inlet hose clamp (3) at the water pump.

    13. Object Number: 1699347 Size: SH
  13. Install the radiator vent inlet hose (2) to the coolant air bleed pipe fitting.
  14. Position the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
  15. Fill the cooling system. Refer to Cooling System Draining and Filling .
  16. Install the air cleaner outlet assembly. Refer to Air Cleaner Assembly Replacement .