Here's a general overview of the process. Specific steps may vary depending on the year and specific engine configuration. Consult a repair manual specific to your 350's year and model for detailed instructions and torque specifications. Those manuals will also show you variations in the seal type (single vs. two-piece) which impacts the process greatly.
General Steps (Highly Simplified):
1. Preparation:
* Disconnect the battery: This is crucial to prevent electrical shorts.
* Drain the oil: Completely drain the engine oil.
* Gather tools: You'll need a variety of tools, including sockets, wrenches, screwdrivers, a transmission jack (highly recommended), possibly a flywheel puller, and a rear main seal installer/remover tool. Consult your repair manual for a complete list.
* Clean the work area: A clean workspace is essential to prevent debris from entering the engine.
2. Transmission Removal (Usually Required): This is the most labor-intensive part. You'll need to disconnect the driveshaft, detach the transmission from the engine, and support the transmission with a jack. This process involves numerous bolts, linkages, and potentially hydraulic lines.
3. Rear Engine Seal Removal: Once the transmission is removed, you can access the rear main seal. The process for removal varies depending on the type of seal (one-piece or two-piece). Special tools often make this easier and less damaging.
4. Clean the Seal Surface: Thoroughly clean the crankshaft and the engine block where the seal sits. Any debris will prevent a proper seal.
5. Install the New Rear Main Seal: Use the proper tool (seal installer) to carefully install the new rear main seal, ensuring it's seated correctly and evenly.
6. Reinstallation: Reinstall the transmission, reconnect all linkages and components, refill the transmission fluid (if applicable), and carefully torque all bolts to the manufacturer's specifications.
7. Refill and Check: Refill the engine oil and check for leaks. Run the engine for a short time and then check the oil level again.
Crucial Considerations:
* One-Piece vs. Two-Piece Seals: The process differs significantly depending on the type of seal your engine has. A one-piece seal is typically easier to replace.
* Crankshaft Alignment: Maintaining the crankshaft's alignment is crucial. Improper alignment can damage the seal.
* Torque Specifications: Following the correct torque specifications is essential to prevent damage to the engine.
* Repair Manual: A factory service manual specific to your vehicle's year and engine is absolutely necessary. It provides detailed instructions, torque specifications, and diagrams.
Strong Recommendation:
This job is complex and requires specialized tools and knowledge. If you're not experienced with engine repair, strongly consider taking your vehicle to a qualified mechanic. Attempting this repair without proper experience can lead to significant engine damage, costly repairs, and potential injury.
