Here's a *general* overview of the process. This is NOT a comprehensive guide and should not be used as your sole instruction. You should consult a repair manual specific to your 1998 Jeep Cherokee Sport (with the correct engine type – 4.0L inline-6 is common) for detailed instructions, torque specifications, and diagrams. Failing to follow proper procedure can cause significant damage to your engine.
Steps involved (generally):
1. Preparation:
* Safety First: Disconnect the negative battery terminal. Wear safety glasses and gloves.
* Gather Tools and Parts: You'll need a complete set of metric sockets and wrenches, various screwdrivers, a transmission jack (highly recommended), a rear main seal installer/remover tool (essential), a new rear main seal (ensure it's the correct one for your engine), RTV sealant, engine hoist (possibly needed depending on access), and cleaning supplies. Consult your repair manual for the exact tools needed.
* Drain Fluids: Drain the engine oil and transmission fluid completely.
2. Transmission Removal (usually necessary): This is the most challenging part. You will likely need to:
* Disconnect the driveshaft.
* Disconnect the transmission linkage.
* Disconnect the cooling lines and electrical connectors from the transmission.
* Support the transmission with a transmission jack.
* Carefully remove the transmission bolts and lower the transmission.
3. Rear Main Seal Removal:
* Once the transmission is removed, you should have access to the rear main seal. Use the specialized tool to remove the old seal, being careful not to damage the crankshaft.
* Clean the crankshaft thoroughly, removing any old sealant or debris.
4. Rear Main Seal Installation:
* Use the specialized tool (installer) to carefully install the new rear main seal. Make sure it's seated evenly.
* Apply a thin bead of RTV sealant to the outside of the new seal, as per the instructions on the sealant and in your repair manual.
5. Transmission Reinstallation:
* Carefully install the transmission, ensuring all bolts are tightened to the correct torque specifications (consult your repair manual).
* Reconnect all linkages, cooling lines, and electrical connectors.
6. Refill Fluids:
* Refill the transmission with the correct type and amount of transmission fluid.
* Refill the engine with the correct type and amount of engine oil.
7. Testing:
* Start the engine and check for leaks. Inspect carefully for any signs of oil leaks around the rear main seal area.
* Let the engine run for a while to ensure the seal is holding.
Important Considerations:
* Repair Manual: A factory service manual is crucial. It will provide detailed instructions, torque specifications, and diagrams specific to your vehicle.
* Engine Hoist: Depending on your access and comfort level, you may need an engine hoist to assist in transmission removal.
* Transmission Jack: Absolutely essential for supporting the transmission during removal and installation.
* Cleanliness: Keep everything exceptionally clean to avoid introducing debris into your engine.
Alternatives:
If you're not comfortable performing this repair yourself, it's highly recommended to take your vehicle to a qualified mechanic. The cost of professional repair will likely be less than the cost of damaging your engine during a botched DIY attempt. The labor cost can be significant because of the complexity of transmission removal.
