One Piece Rear Main Seal

Convert a One-Piece Rear Main Seal to a Two-Piece Rear Main Seal

Introduction

One-piece rear main seals were used on Ford 429-460 big-blocks from the late 1960s to the early 1980s. These seals are prone to failure, which can lead to oil leaks. Converting a block from a one-piece rear main seal design to the older two-piece design is relatively easy and can be done in a few hours.

Parts Required

You will need the following parts to complete this conversion:

• Two-piece rear main seal kit
• Rear main seal retainer gasket
• Oil pan gasket
• RTV sealant

Instructions

To convert a block from a one-piece rear main seal design to a two-piece design, follow these steps:

1. Remove the oil pan.
2. Remove the rear main seal retainer.
3. Remove the one-piece rear main seal.
4. Install the two-piece rear main seal.
5. Install the rear main seal retainer gasket.
6. Install the oil pan gasket.
7. Install the oil pan.
8. Add oil to the engine.
9. Start the engine and check for leaks.

Tips

Here are a few tips to help you complete this conversion successfully:

• Make sure that the crankshaft is clean and free of any debris before installing the new seal.
• Use a liberal amount of RTV sealant on the rear main seal retainer gasket and the oil pan gasket.
• Tighten the oil pan bolts to the specified torque.
• Start the engine and check for leaks before driving the vehicle.

By following these steps, you can easily convert a block from a one-piece rear main seal design to the older two-piece design. This conversion will help to prevent oil leaks and keep your engine running smoothly.