1. Gather Tools
- Oil drain pan
- 3/8-inch socket wrench and extension
- Ratchet
- Oil filter wrench
- New oil pan gasket
- New rear main seal
- RTV silicone sealant
- Replacement oil
2. Prepare Vehicle
- Park the truck on a level surface.
- Engage the parking brake.
- Disconnect the negative terminal from your battery.
- Slide an oil drain pan under the oil drain plug.
3. Drain the Oil
- Loosen the oil drain plug with a 3/8-inch socket wrench and extension.
- Allow the oil to completely drain out.
4. Remove the Oil Pan Bolts
- Locate the oil pan bolts around the perimeter of the oil pan.
- Use your socket wrench and ratchet to loosen and remove the bolts.
- Be cautious as some oil may still drip from the pan.
5. Remove the Oil Pan
- Carefully pry the oil pan loose from the engine block using a pry bar or flat-head screwdriver.
- Be mindful of the gasket material that may still be attached to the oil pan or engine block.
6. Clean the Oil Pan and Engine Block Surface
- Thoroughly clean the oil pan and engine block mating surfaces using a degreaser and a scraper.
- Remove all traces of old gasket material.
7. Apply RTV Sealant
- Apply a thin bead of RTV silicone sealant to the oil pan mating surface on the engine block.
8. Install the New Gasket
- Place the new oil pan gasket on the oil pan, ensuring it is properly aligned.
9. Reinstall the Oil Pan
- Carefully position the oil pan back into place on the engine block, aligning the gasket.
10. Reinstall the Oil Pan Bolts
- Reinsert the oil pan bolts and hand-tighten them.
- Use the socket wrench and ratchet to fully tighten the bolts in a crisscross pattern to ensure even pressure.
11. Replace the Oil Filter
- Remove the old oil filter using an oil filter wrench.
- Apply a thin coat of new oil to the gasket of the new oil filter before screwing it on by hand.
- Use the oil filter wrench to tighten the oil filter snugly, but do not overtighten.
12. Add New Oil
- Reinstall the oil drain plug, ensuring it is tightened securely.
- Use a funnel to add new engine oil to the truck, referring to your owner's manual for the recommended oil type and quantity.
13. Reconnect Battery
- Reconnect the negative terminal of the battery.
14. Test for Leaks
- Start the truck and let it run for a few minutes.
- Check underneath the vehicle for any leaks from the oil pan.
- If no leaks are detected, turn off the engine and lower the vehicle.
By following these steps, you can successfully replace the rear main seal on your 1967 Ford F-250 without removing the engine.
