Water Pump: Service and Repair
WATER PUMPREMOVAL
The water pump on 3.7L/4.7L engines is bolted directly to the engine timing chain case cover.
1. Disconnect negative battery cable.
2. Drain cooling system.
3. Remove fan/viscous fan drive assembly from water pump. Do not attempt to remove fan/ viscous fan drive assembly from vehicle at this time.
4. If water pump is being replaced, do not unbolt fan blade assembly from thermal viscous fan drive.
5. Remove two fan shroud-to-radiator screws.
6. Remove fan shroud and fan blade/viscous fan drive assembly from vehicle.
7. After removing fan blade/viscous fan drive assembly, do not place thermal viscous fan drive in horizontal position. If stored horizontally, silicone fluid in viscous fan drive could drain into its bearing assembly and contaminate lubricant.
8. Remove accessory drive belt from the water pump pulley (2).
9. Remove upper radiator hose clamp and remove upper hose at water pump.
10. Remove seven water pump mounting bolts and one stud bolt.
CAUTION: Do not pry water pump at timing chain case/cover. The machined surfaces may be damaged resulting in leaks.
11. Remove water pump and gasket. Discard gasket.
CLEANING
Clean the gasket mating surface. Use caution not to damage the gasket sealing surface.
INSPECTION
Inspect the water pump assembly for cracks in the housing, water leaks from shaft seal, worn bearing or impeller rubbing either the pump body or timing chain case/cover.
INSTALLATION
1. Clean gasket mating surfaces.
2. Using a new gasket, position water pump (1) and install mounting bolts as shown. Tighten water pump mounting bolts to 58 Nm (43 ft. lbs.) torque.
3. Spin water pump to be sure that pump impeller does not rub against timing chain case/cover.
4. Connect radiator upper hose to water pump.
5. Install accessory drive belt.
6. Position fan shroud and fan blade/viscous fan drive assembly.
7. Install two fan shroud-to-radiator screws.
8. Be sure of at least 25 mm (1.0 inches) between tips of fan blades and fan shroud.
9. Install fan blade/viscous fan drive assembly to water pump shaft.
10. Fill cooling system.
11. Connect negative battery cable.
12. Start and warm the engine. Check for leaks.