Table of contents: Removal ↓ Installation ↓
Removal
1. Drain the cooling system.
2. Disconnect the negative cable from the battery.
3. Remove the upper radiator hose.
4. Loosen the screws securing the upper radiator casing, release the clamps (by squeezing them) securing the upper casing to the lower casing and remove the upper casing from the engine compartment of the vehicle.
5. Loosen the alternator adjusting bolt and remove the drive belt(s) from the water pump pulley.
6. Loosen the nuts securing the fan clutch and pulley to the water pump flange, remove the washers.
7. Separate the fan, its coupling assembly and pulley from the water pump and remove the components from the vehicle.
8. On 3.0 l models:
- Remove the timing belt;
- Loosen the water pump mounting bolts, noting the length and location of each one.
9. On 4.2L models, loosen the bolts securing the water pump to the timing chain cover and remove the pump from the cover (the 4.2L water pump components are shown in the accompanying illustration).
1 - bolts; 2 - fan; 3 - Clutch assembly; 4 - pulley; 5 - water pump; 6 - nuts; 7 - washers
10. Check the pump body and rotor for signs of corrosion, cracks and other defects.
11. Check the bearing play in the pump body, evaluate the level of noise emitted by the bearing when the pump rotates.
12. Check the condition of the clutch assembly by turning it manually. Rotation should occur without jerks and jamming points, with slight resistance. The unit is not repairable and in case of failure is subject to replacement.
Note: Due to the design features of the water pump, repairing it seems inappropriate. The authors of this Manual recommend replacing the pump assembly in case of failure.
Installation
1. Installation is carried out in reverse order.
2. Make sure that the mating surfaces of the water pump and engine are clean - there should be no traces of old sealant left on them.
3. Apply a sealant pad with a cross-section of Ø 2÷3 mm to the mating surface of the pump. Make sure that the sealant is applied from the inside of the bolt holes.
4. On 3.0 l models:
- Install the pump on the cylinder block and tighten its mounting bolts in the order and with the force shown in the accompanying illustration, where: A = 16÷21 Nm, B = 7÷8 Nm, C = 30÷40 Nm.
- Install the timing belt in place.
5. On 4.2L models, install the water pump onto the timing chain cover and tighten the water pump mounting bolts to the specified torque (see size and adjustment tables at the end of the Guide).
6. Install the drive pulley, clutch assembly and fan onto the pump. Tighten the mounting nuts to the required torque.
7. Install the drive belt(s) and adjust its (their) tension.
8. Install the upper radiator shroud and tighten the screws securely.
9. Connect the negative cable to the battery.
10. Reinstall the upper radiator hose and fill the system with the required amount of coolant of the correct grade (see size and adjustment tables at the end of the Guide).
11. Start the engine and check for leaks.