Here's a general overview of the process, but remember this is not a substitute for a proper repair manual:
1. Preparation:
* Safety First: Disconnect the negative battery terminal. Support the van securely on jack stands. Wear safety glasses and gloves.
* Gather Tools and Supplies: You'll need a variety of tools including sockets, wrenches, screwdrivers, a puller (possibly), a seal installer, new rear main seal, fresh engine oil, new oil filter, and possibly a new oil pan gasket (depending on the access method). Again, your repair manual will specify the exact tools needed.
* Drain the Oil: Completely drain the engine oil.
* Remove Transmission (Most Common Method): This is the most common approach, though there are some methods (depending on the engine) that avoid transmission removal. This is the hardest part of the job and requires significant mechanical knowledge. You'll need to disconnect various components, such as driveshafts, shift linkage, and possibly the torque converter. The process is very engine-specific, and the repair manual will be essential.
2. Accessing the Rear Main Seal:
* After Transmission Removal (Usually): Once the transmission is removed, you'll have access to the rear of the engine block. You might need to remove the flywheel (depending on the engine) to get to the seal.
* Alternative Methods (Less Common): Some methods allow rear main seal replacement without transmission removal, but these are often more difficult and may require specialized tools.
3. Removing the Old Seal:
* Carefully Pry Out the Old Seal: Use a seal puller or carefully pry out the old seal, taking care not to damage the engine block.
4. Installing the New Seal:
* Install the New Seal: Use a seal installer tool to properly install the new seal, ensuring it's seated correctly. Improper installation can lead to leaks.
5. Reassembly:
* Reinstall the Flywheel (If Removed): Torque the flywheel bolts to the specifications in your repair manual.
* Reinstall the Transmission: This is the reverse of the removal process.
* Reinstall other components: Reattach all disconnected parts.
* Add New Oil and Filter: Fill the engine with the correct amount and type of oil, and install a new oil filter.
6. Testing:
* Run the Engine: Start the engine and check for leaks. Observe carefully for any oil leaks around the rear main seal area.
Important Considerations:
* Engine Type: The specific procedure varies greatly depending on the type of engine in your Econoline van (e.g., 4.9L inline-6, 5.0L V8, 5.8L V8, etc.). You MUST use a repair manual for your *specific* engine.
* Transmission Type: The transmission type also impacts the difficulty.
* Professional Help: If you are not comfortable with this level of repair, take your van to a qualified mechanic. A botched rear main seal replacement can lead to significant engine damage.
This is a highly simplified overview. The complexity and potential for damage are high. Use a repair manual specific to your 1993 Ford Econoline van's engine. Don't attempt this repair without the necessary knowledge, tools, and a detailed guide.
