However, if you're determined to do it yourself, here's a *general* outline. This is not a complete step-by-step guide, and variations exist depending on the specific engine (2.2L or 2.4L). Always consult a repair manual specific to your year and engine for precise instructions and torque specifications.
General Steps (Highly Simplified):
1. Preparation: Disconnect the battery negative terminal. Gather all necessary tools, including a transmission jack, engine support, various sockets and wrenches, a rear main seal installer, and a quality rear main seal. You'll likely need specialized tools to properly install the new seal. Purchase a repair manual for your specific vehicle.
2. Drain Fluids: Drain the engine oil, transmission fluid (automatic or manual), and coolant.
3. Access the Transmission: This is the most challenging part. You'll likely need to:
* Remove the driveshaft: This involves disconnecting various components at both ends.
* Remove the transmission: This requires disconnecting numerous components, including the transmission mount, shifter linkage, and possibly the exhaust system. This is often the most labor-intensive part and requires significant lifting capability (transmission jack). You might need to support the engine with an engine support bar.
4. Remove the Flywheel/Flexplate (Automatic/Manual): This step differs depending on your transmission type. The flywheel is on manual transmissions; the flexplate is on automatics. This might require specialized tools.
5. Access the Rear Main Seal: With the transmission removed, you'll finally have access to the rear main seal.
6. Remove the Old Seal: Carefully remove the old seal, ensuring you don't damage the crankshaft. Use the appropriate tools to avoid damaging the crankshaft surface.
7. Install the New Seal: Use the rear main seal installer tool to carefully install the new seal. Make sure it seats properly and is flush.
8. Reassembly: Reassemble everything in reverse order, ensuring all bolts and connections are tightened to the correct torque specifications (refer to your repair manual). Double-check all fluid levels and connections before starting the engine.
9. Final Checks: After reassembly, check for leaks. Run the engine for a short period, then check for leaks again. Top off fluids as needed.
Crucial Considerations:
* Repair Manual: An accurate repair manual specific to your 2000 Chevy Cavalier is absolutely essential. This will provide detailed instructions, torque specifications, and diagrams.
* Specialized Tools: You'll need a transmission jack, engine support, and potentially several specialized tools for removing and installing the rear main seal.
* Safety: Working on an engine requires caution. Use jack stands properly, wear safety glasses, and be aware of hot surfaces and moving parts.
* Cleanliness: Keep the area clean to prevent debris from damaging the new seal.
Again, this is a complex job. If you lack the necessary experience or tools, take your car to a qualified mechanic. The cost of a professional repair will likely be less than the cost of making a mistake and causing further damage.
