BMW F20 F21 F30 F31 LCI 118d 318d Diesel B47 Dual Twin Mass Flywheel Clutch Kit

Description

BMW F20 F21 F30 F31 LCI 118d 318d Diesel B47 Dual Twin Mass Flywheel Clutch Kit is an original dual-mass flywheel from the Flywheels and gears category, designed for BMW diesel units with the B47 engine. This used OEM component is a sensible choice for drivers looking for a technically matched solution that restores proper drivetrain operation and reduces unwanted vibrations. Thanks to its factory design, the dual-mass flywheel maintains the correct damping characteristics for the diesel engine, which translates into smoother drivetrain operation and greater driving comfort.

Specifications and technical data

• SKU: 8631807
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8631807
• Substitutable numbers: 21208631807, 8631807, 21207615627, 7615627, 21207628091, 7628091, 21208605090, 8605090, 21217641232, 7641232
• Fuel type: Diesel
• Category: Flywheels & Flexplates

Purpose and compatibility with the B47 Diesel unit

The presented dual-mass flywheel is designed to work with the Diesel engine, characteristic of the BMW 1 Series F20/F21 and 3 Series F30/F31 models in 118d and 318d versions with the B47 unit. The construction of the dual-mass flywheel is adapted to the specific operation of a modern diesel engine – high torque at low RPM and higher gearbox loads.

Properly selected torsional vibration damping parameters allow for reducing the transmission of vibrations from the crankshaft to the gearbox, which decreases noise, improves drivetrain refinement, and supports the durability of other drivetrain components.

Technical characteristics of the dual-mass flywheel

The dual-mass flywheel from this series belongs to the Flywheels and gears group, which means it serves both as a rotational energy storage device and an advanced vibration damper. In practice, it consists of two masses working together, connected by a system of springs and friction elements that reduce the torque spikes generated by the engine.

• torsional vibration damping across a wide RPM range,
• relief for the gearbox and clutch,
• reduction of noise and jerking during starting and gear changes,
• maintenance of stable idle speed.

Thanks to the factory design, the dual-mass flywheel maintains the correct operating characteristics for the specific BMW drivetrain configuration, which is crucial when replacing this component in cars with the B47 engine.

Used condition and installation recommendations

The offered dual-mass flywheel is a used component, which allows for lower repair costs compared to a new OEM part, while maintaining structural compatibility with the factory solution. Before installation, standard workshop verification is recommended – assessing play, spring operation, and mating surfaces – to confirm that the operating parameters meet the vehicle’s requirements.

When replacing the dual-mass flywheel, it is worth checking the clutch, release bearing, and the condition of seals around the gearbox. Correct installation, adhering to tightening torques and manufacturer procedures, has a direct impact on the durability of the entire drivetrain.

Benefits of using an original BMW dual-mass flywheel

Using an original dual-mass flywheel in a BMW F20/F21/F30/F31 with a B47 engine brings a number of practical benefits:

• factory fitment for the specific engine unit and gearbox,
• maintenance of the drivetrain operating characteristics intended by the manufacturer,
• reduction of vibrations and noise in the cabin,
• support for the durability of the gearbox and clutch components.

For users who treat their BMW as a daily means of transport, choosing an original dual-mass flywheel is a way to maintain driving comfort and predictable car behavior under various load conditions.

Related components and technical knowledge

If you are planning a comprehensive repair or upgrade of the engine and drivetrain area in your BMW and need other elements from the same group, such as additional gears, starter-related components, or torque transmission parts, check out the available parts in the BMW Flywheels and gears category.

For those considering the use of used components in upgrade or light tuning projects, practical tips on selecting and assessing the condition of such elements may be useful – you will find them in the article The best used parts for tuning your car. If you are interested in a broader context of using salvaged parts for repairs, it is also worth reading the guide No parts at the dealership? How to handle repairs of older models using salvaged parts, which discusses the economic and technical aspects of such solutions.