BMW 1 3 Series F20 F21 F30 F31 LCI Engine Mount Rubber Left N/S 6859407

BMW 1 3 Series F20 F21 F30 F31 LCI Engine Mount Rubber Left N/S is an original component from the Engine mounts group, designed for installation on the left side in selected BMW F-series models. This used OEM part ensures factory-fit, stable support for the powertrain, and predictable drivetrain behavior during acceleration, braking, and load changes.

Specifications and technical data

• SKU: 6859407
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6859407
• Substitutable numbers: 22116859407, 6859407
• Location on the vehicle: Left
• Category: Engine Mounts

Purpose and function in the drivetrain

The engine mount is responsible for transferring loads from the powertrain to the chassis and for dampening vibrations generated by the running engine. In BMW F-series models, its proper operation affects:

• reduction of vibrations transmitted to the passenger cabin,
• stable positioning of the powertrain relative to the chassis,
• reduction of stress on other engine and transmission mounting components,
• more precise vehicle handling during dynamic driving.

The version mounted on the left side works in conjunction with other support points to create a cohesive engine mounting system, which is particularly important in vehicles with stiff suspension and higher power output.

Benefits of using an original engine mount

Using an original engine mount dedicated to specific BMW models allows for maintaining the operating parameters intended by the manufacturer. Key advantages include:

• Factory geometric fit – compatibility of mounting points with the engine block and chassis without the need for modifications.
• Properly selected stiffness – a balance between vibration damping comfort and handling precision, characteristic of BMW.
• Compatibility with the stock suspension and other drivetrain components.
• The ability to restore the original refinement of the powertrain after replacing a worn mount.

By maintaining the original design, replacing it with this mount helps reduce unwanted vibrations, knocking during start-up, and excessive powertrain movement.

Condition, origin, and installation aspects

The offered engine mount is a used component, sourced from dismantling, which allows for combining an attractive price with the maintenance of BMW-specific operating parameters. Before installation, a standard visual inspection and verification of the mounting points on the vehicle are recommended to ensure proper seating of the component.

During replacement, it is worth paying attention to:

• the condition of other engine and transmission mounts,
• proper support of the powertrain during removal and installation,
• precise tightening of bolts according to the vehicle manufacturer's recommendations.

Operation of used engine mounts

To maximize the potential of a used engine mount, it is worth applying smoother load transitions (avoiding sudden drivetrain jerks) and regularly checking the condition of the mounts. Practical tips on maintenance and operation of dismantled parts can be found in the article How to extend the life of used car parts?, which discusses, among other things, the principles of caring for drivetrain components.

Expanding the scope of service work

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as additional mounts, brackets, or other powertrain supports, check the available parts in the BMW Engine mounts category.

In summary, BMW 1 3 Series F20 F21 F30 F31 LCI Engine Mount Rubber Left N/S is a functional solution for users who want to restore proper powertrain support, reduce vibrations, and maintain the driving characteristics typical of BMW by using a proven, used OEM part.