That said, here's a *general* overview of the process. The specifics will vary greatly depending on the engine (e.g., 4.0L, 2.5L, etc.) in your 1989 Jeep. You MUST consult a repair manual specific to your Jeep's engine. A Haynes or Chilton manual is a good investment.
General Steps (Highly Simplified and Engine-Specific):
1. Preparation:
* Safety First: Disconnect the negative battery cable.
* Gather Tools and Parts: You'll need valve spring compressors, valve stem seal installer/remover tools, new valve stem seals, socket set, wrenches, torque wrench, engine hoist or jack stands (likely), and plenty of clean rags.
* Consult your repair manual: This step is CRUCIAL. It will provide engine-specific instructions, torque specifications, and diagrams.
2. Remove Cylinder Head:
* This is the most labor-intensive part. It involves removing various components like the intake manifold, valve covers, timing chain/belt (depending on the engine), and potentially other parts to access the cylinder head bolts. Your repair manual will guide you through this process.
* Once the cylinder head is removed, it might need to be taken to a machine shop for inspection and cleaning.
3. Remove Valves:
* Carefully compress the valve springs using the spring compressor. This is crucial to avoid damaging the valve or spring.
* Remove the keepers and then the valves.
4. Replace Valve Stem Seals:
* Using the appropriate tools (installer/remover), carefully remove the old valve stem seals.
* Install the new valve stem seals, making sure they are seated correctly. Again, the proper tools are essential here.
5. Reassemble:
* Reinstall the valves, keepers, and springs. Ensure the springs are properly seated and compressed before releasing the compressor.
* Reinstall the cylinder head, ensuring proper torque on all bolts (refer to your repair manual for precise torque specifications).
* Reassemble all other components you removed earlier.
6. Check for Leaks:
* Once the engine is back together, carefully check for any leaks.
Important Considerations:
* Valve Adjustment: After reinstalling the cylinder head, you may need to adjust the valve lash (clearance). This requires specialized tools and knowledge.
* Timing Chain/Belt: If you removed the timing chain or belt, ensure it's properly aligned before starting the engine. Incorrect timing can cause catastrophic engine damage.
* Engine Cleaning: Thoroughly clean the engine and components before reassembly.
Again, I strongly recommend using a repair manual specific to your 1989 Jeep's engine. This process is complex and involves significant risk of engine damage if not done correctly. If you're unsure about any step, seek professional help. The cost of a professional repair is far less than the cost of a damaged engine.
