Tools You'll Likely Need:
* Repair Manual: Absolutely essential.
* Socket set (metric): Various sizes, including deep sockets.
* Wrench set (metric): Combination wrenches are helpful.
* Ratchet and extensions: To reach tight spots.
* Torque wrench: Crucial for proper tightening of bolts.
* Drain pan: To catch coolant.
* New water pump: Make sure it's the correct one for your specific engine.
* New gasket(s) and seals: For the water pump and thermostat housing (if applicable).
* Coolant: Use the correct type for your vehicle.
* Jack and jack stands: For safe working conditions.
* Pliers: Possibly needle-nose pliers.
* Screwdrivers: Phillips and flathead.
* Cooling system pressure tester (optional but recommended): To check for leaks after the job.
General Steps (Consult your repair manual for precise details):
1. Safety First: Disconnect the negative battery terminal. Allow the engine to cool completely before starting.
2. Drain the Coolant: Locate the radiator drain petcock and drain the coolant into your drain pan. You might also need to remove the lower radiator hose.
3. Access the Water Pump: This often involves removing components like the fan, fan shroud, belts, and possibly the serpentine belt tensioner. Your repair manual will provide detailed instructions on removing these components. Take pictures as you go to help with reassembly.
4. Remove the Water Pump: You'll likely need to remove several bolts securing the water pump to the engine block. These bolts can be stubborn and may require penetrating oil and patience.
5. Clean the Surface: Carefully clean the engine block mating surface where the water pump sits. Any debris can prevent a proper seal.
6. Install the New Water Pump: Apply a thin, even bead of sealant (specified by the water pump manufacturer) to the new water pump gasket. Install the new water pump, ensuring the gasket is properly seated. Tighten the bolts to the manufacturer's specified torque using a torque wrench.
7. Reassemble: Reinstall all components removed in step 3, ensuring everything is properly aligned and tightened.
8. Refill the Cooling System: Carefully refill the cooling system with the correct type and amount of coolant. Bleed the air from the system by running the engine with the radiator cap off (carefully!) until the thermostat opens and coolant flows steadily. Reinstall the radiator cap.
9. Check for Leaks: Run the engine for a while and carefully inspect for any leaks around the water pump and other connections. Use the pressure tester (if you have one) to verify system integrity.
10. Top Off Coolant (if necessary): After the engine has cooled, check the coolant level and top off as needed.
Important Considerations:
* Timing Belt: On some engines, the water pump is driven by the timing belt. Replacing the water pump might require timing belt replacement as well—check your repair manual. This is a more complex procedure.
* Thermostat: While not strictly necessary, it's often a good idea to replace the thermostat at the same time as the water pump, as they are similar in age and wear.
* Professional Help: If you're not comfortable with this repair, consider taking your vehicle to a qualified mechanic. Improper repair can lead to serious engine damage.
This is a simplified overview. Always refer to a repair manual specific to your 1996 Jeep Cherokee for detailed instructions and torque specifications. Improper repair can cause significant engine damage. Safety first!
