Water Pump Replacement 4.8L, 5.3L, and 6.0L Engines

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Loosen the air cleaner outlet duct clamps at the following locations:

•	Throttle body

•	Mass airflow/intake air temperature (MAF/IAT) sensor

3. Remove the radiator inlet hose clip from the outlet duct.
4. Remove the air cleaner outlet duct.



5. If necessary, remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement in Engine Mechanical - 4.8L, 5.3L, and 6.0L.
6. Remove the radiator vent inlet hose from the radiator hose clips.



7. Reposition the inlet hose clamp at the water pump.
8. Remove the inlet hose from the water pump.
9. Remove the fan blade. Refer to Fan Replacement .
10. Remove the accessory drive belt. Refer to Drive Belt Replacement - Accessory in Engine Mechanical - 4.8L, 5.3L, and 6.0L.



11. Reposition the outlet hose clamp at the water pump.
12. Remove the outlet hose from the water pump.



13. Reposition the surge tank outlet hose clamp at the water pump.
14. Remove the surge tank outlet hose from the water pump.



15. Reposition the heater inlet hose clamp at the water pump.
16. Remove the heater inlet hose from the water pump.



17. Remove the water pump bolts.
18. Remove the water pump and gaskets.
19. Discard the water pump gaskets.

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

1. Install the water pump and NEW gaskets.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the water pump bolts.

Tighten

1. Tighten the water pump bolts a first pass to 15 N·m (11 lb ft).
2. Tighten the water pump bolts a final pass to 30 N·m (22 lb ft).



3. Install the heater inlet hose to the water pump.
4. Position the heater inlet hose clamp at the water pump.



5. Install the surge tank outlet hose to the water pump.
6. Position the surge tank outlet hose clamp at the water pump.



7. Install the outlet hose to the water pump.
8. Position the outlet hose clamp at the water pump.
9. Install the accessory drive belt. Refer to Drive Belt Replacement - Accessory in Engine Mechanical - 4.8L, 5.3L, and 6.0L.
10. Install the fan blade. Refer to Fan Replacement .



11. Install the inlet hose to the water pump.
12. Position the inlet hose clamp at the water pump.



13. Install the engine vent inlet hose to the radiator hose clips.
14. If necessary, install the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement in Engine Mechanical - 4.8L, 5.3L, and 6.0 L.




Important: Align the arrow at the throttle body end of the duct with the throttle body attaching stud.

15. Install the air cleaner outlet duct.
16. Install the radiator inlet hose clip to the outlet duct.
17. Tighten the air cleaner outlet duct clamps at the following locations:

•	Throttle body

•	MAF/IAT sensor

Tighten
Tighten the air cleaner outlet duct clamp screws to 7 N·m (62 lb in).

18. Fill the cooling system. Refer to Cooling System Draining and Filling .

Water Pump Replacement 8.1L Engine

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Remove the drive belt. Refer to Drive Belt Replacement - Accessory in Engine Mechanical - 8.1 L.
3. Remove the fan clutch. Refer to Fan Clutch Replacement .
4. Reposition the outlet hose clamp at the water pump.
5. Remove the outlet hose from the water pump.



6. Reposition the bypass hose clamps at the water pump and water crossover.
7. Remove the bypass hose.



8. Remove the water pump bolts.
9. Remove the water pump.
10. Remove and discard the water pump gaskets.

1. Place NEW water pump gaskets into place.
2. Install the water pump.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the water pump bolts.

Tighten
Tighten the water pump bolts to 50 N·m (37 lb ft).




4. Install the bypass hose.
5. Position the bypass hose clamps at the water pump and water crossover.



6. Install the outlet hose to the water pump.
7. Position the outlet hose clamp at the water pump.
8. Install the fan clutch. Refer to Fan Clutch Replacement .
9. Install the drive belt. Refer to Drive Belt Replacement - Accessory in Engine Mechanical - 8.1 L.
10. Fill the cooling system. Refer to Cooling System Draining and Filling .