How to Replace Leading Edge and U-Jamb Seals

Have you been experiencing wind noise in your cabin or is there evidence of a leak you can’t find? It’s time to check your lock pillar and leading edge seals.

A functioning lock pillar filler and leading edge on a classic vehicle are important for protecting the interior, preventing water and debris entry, reducing noise, and maintaining the vehicle’s aesthetic appeal.

The U-jamb (also known as lock pillar fillers) are found on the inside of the doors.

A door lock pillar seal is the rubber part found where the rear quarter window meets the lock pillar. It serves as the access manager for the quarter window seals. Without this piece water and dust would accumulate on the quarter panel; elements that would eventually lead to rust.

The leading edge seals the rear quarter window to the side window when they are rolled up.

Replacing these parts is easy and can be done at home with only a screwdriver and a bottle of soapy water. A good lock pillar filler has a metal core that holds the screws in place and keeps the part sturdy.

It is best to change the seals on both doors at the same time since they will probably both be worn and this also saves you from searching for individual parts later.

The fillers go by other names including lock pillar seals or just filler seals. The quarter window seals are also called leading edge.

Replacing the seals:

1. Begin by using a screwdriver to carefully remove the quarter window filler. This filler is typically located on the lock pillar of the car and covers the edge of the quarter window.

2. Once the filler is removed, you will notice a quarter window seal or gasket that is attached to the edge of the glass. To remove this seal, slide it down against the edge of the glass until it is completely detached. Take care not to damage the glass or the seal during this process.

3. Before installing the new seal, it’s a good idea to lubricate it with soapy water. This will make it easier to slide the seal into position and ensure a proper fit. Apply a thin layer of soapy water to the seal, paying attention to both the inner and outer surfaces.

4. With the new seal lubricated, you can now begin inserting it from the bottom of the quarter window opening. Start by positioning the bottom of the seal in place and gradually work your way up, pressing the seal firmly against the edge of the glass as you go. Take your time to ensure that the seal is properly seated and evenly aligned.

5. Once the new seal is in place, you can proceed to reattach the quarter window filler. Align the filler in the correct placement, ensuring that it covers the edge of the quarter window and fits securely. Use a screwdriver to screw it back into place, making sure the screws are tightened adequately but not over-tightened to avoid damage.

At Steele, we’re more than just high-quality products, we’re your trusted resource for completing your weatherstripping projects with confidence.

Whether you’re working on a classic car or truck, street rod, RV, or boat, our expert team is here to help. If you have questions about weatherstripping or need product guidance, we’re just a call or click away.

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