1. Disconnect the Battery:
- Disconnect the negative battery terminal to ensure the vehicle is electrically disabled before starting the repair process.
2. Remove Transmission:
- Unbolt the transmission from the engine block. This may require removing starter or other components for access.
- Support the transmission with a transmission jack or other suitable means to prevent it from falling.
- Remove transmission from vehicle once all bolts and connections are undone.
3. Remove Flywheel Cover Plate Bolts:
- Locate the bolts that hold the flexplate or flywheel cover plate to the engine block. These bolts are typically located around the perimeter of the plate.
4. Remove Starter:
- Remove starter to create enough clearance to access the flywheel bolts completely.
5. Remove Flywheel Bolts:
- Using a breaker bar and appropriate socket, loosen and remove the bolts that secure the flexplate to the crankshaft.
6. Remove Flexplate:
- Once all bolts are removed, carefully pry the flexplate off the crankshaft. Be careful not to drop any components or bolts into the engine.
7. Clean and Inspect Plate Surface:
- Use a cleaning solution to remove any dirt or gasket residue from the surface of the flexplate and mating surface on the engine block. Inspect for any damage, cracks, or wear on either surface.
8. Replace Rear Main Seal:
- With the flexplate removed, you will have access to the rear main seal. Follow the necessary steps to replace the rear main seal.
9. Reinstall the Flexplate:
- Place the new flexplate onto the crankshaft, ensuring it is properly seated and aligned with the dowel pins.
10. Install Flywheel Bolts:
- Reinstall the flywheel bolts and tighten them in a star pattern to evenly distribute the clamping force.
11. Reinstall Transmission:
- Reinstall transmission if you removed it previously and reconnect all the bolts.
12. Reinstall Starter:
- Reinstall starter if it was removed.
13. Reconnect Battery:
- Reconnect the battery's negative terminal.
14. Test Engine:
- Start the engine and check for any leaks or unusual noises. Confirm that the rear main seal is effectively preventing oil leaks.
Remember, this process can vary depending on the exact year and model of your Chevrolet 350 engine, so it's always a good idea to refer to a vehicle-specific repair manual before starting the work. If you encounter any difficulties, it's best to consult with a qualified mechanic for assistance.
