BMW E91 E91N Outer Weatherstrip Rear Left Door N/S 51357140731

BMW E91 E91N Outer Weatherstrip Rear Left Door N/S is a precisely fitted body component responsible for effectively draining water from the rear left door window and protecting the window edge. As part of the Door Seals group, it ensures stable window operation and prevents contaminants from entering the door interior, which contributes to a longer service life for the window regulator mechanisms. This solution is dedicated to BMW 3 Series E91/E91N models and is mounted on the rear left side of the vehicle.

Specifications and technical data

• SKU: 7140731
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 51357140731
• Substitutable numbers: 51357140731, 7140731
• Location on the vehicle: Rear, Left
• Category: Door Seals

Purpose and function of the weatherstrip

The described weatherstrip is a component mounted on the rear left door of the BMW E91/E91N, in the area where the window meets the door panel. Its function is to:

• mechanically wipe water from the window surface during raising and lowering,
• limit the ingress of dust, mud, and road salt into the door interior,
• stabilize the window edge in the guide, which improves the operating smoothness of the window mechanism,
• protect the paint and seals from accelerated wear in the contact zone with the window.

Thanks to its proper profile and fit for the 3 Series estate body, the strip helps maintain proper sealing and improves acoustic comfort in the rear part of the cabin.

Compatibility with BMW E91 / E91N

The strip has been designed specifically for the E91/E91N body, taking into account the geometry of the rear left window and the shape of the door frame. Proper profiling and mounting points allow for installation in factory locations without the need for modifications. The placement on the vehicle, defined as rear – left side, ensures clear identification of the component and eliminates the risk of confusion with strips from other positions or sides of the body.

To maintain proper operation of the window mechanism and door sealing, it is recommended to install the strip according to the direction intended by the vehicle manufacturer, checking for proper adhesion along the entire length of the window edge.

Performance characteristics and advantages

As an element from the Door Seals category, the rear left weatherstrip in the BMW E91/E91N affects several important operational aspects:

• improves protection of the door interior against moisture, which promotes longer durability of mechanisms and electrical installations,
• reduces the formation of scratches on the window in the guide working zone,
• supports maintaining proper sealing in the area where the window meets the door,
• allows for maintaining a consistent appearance of the side body line, without gaps or deformations around the window edge.

A used original part of this type is often chosen as a reasonable alternative to new parts, allowing for the preservation of factory fit and geometry while optimizing repair costs.

Condition and installation aspects

The strip is offered as a used part, which in practice means it comes from vehicle dismantling and may show signs of normal wear while maintaining the functionality required for further use. Before installation, it is worth verifying the condition of the working surface in the area of contact with the window and the flexibility of the wiping edge to ensure proper adhesion.

During installation, it is recommended to:

• thoroughly clean the door edge and window guide,
• check for proper seating in the clips and guides,
• verify the smoothness of window operation after installation, across the full range of motion.

Related items from the same group

If you are planning a comprehensive repair or upgrade of the door area in your BMW and need other components from the same group, such as additional weatherstrips, perimeter seals, or lower door sill seals, check the available parts in the BMW Door Seals category.

Technical support and additional knowledge

When performing bodywork and exterior component renovations, there is often a need to refresh other visual components as well, such as wheels. If you are considering refurbishing or replacing the rims in your car, you will find useful information in the article Used rims like new: a guide to buying and refurbishing alloy wheels, which helps you consciously plan the scope of work and choose the right solutions.