Twin Mass BMW F20 F21 F30 F31 LCI B46 B48 Petrol Dualmass Flywheel 8671022

Twin Mass BMW F20 F21 F30 F31 LCI B46 B48 Petrol Dualmass Flywheel is an original drivetrain component designed for petrol engines of this generation. Engineered by BMW for precise compatibility with B46/B48 units, it ensures stable drivetrain operation and reduces torsional vibrations. This used component from the Clutch Kits category allows for an economical yet technically sound repair of your vehicle's clutch system.

Specifications and technical data

• SKU: 8671022
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8671022
• Substitutable numbers: 8671022, 21208671022, 2395868, 21202395868, 8605489, 21208605489
• Fuel type: Petrol
• Category: Clutch Kits

Purpose and technical compatibility

The presented dual-mass flywheel is dedicated to BMW F-series models with the LCI facelift, equipped with B46 and B48 petrol engines. The design was developed for the specific torque characteristics of these units, which translates into proper vibration damping and correct interaction with the clutch disc and pressure plate within the Clutch Kits group.

The component is intended for systems powered by petrol fuel, which is significant for operating characteristics and the selection of damping springs. Using the correct dual-mass flywheel in this type of drivetrain improves engine refinement, reduces noise, and protects the gearbox from excessive dynamic loads.

Construction and function of the dual-mass flywheel

In this application, the dual-mass flywheel performs several key functions in the drivetrain:

• damping of torsional vibrations generated by the direct-injection petrol engine,
• stabilization of idle speed and low RPM operation,
• relief of the transmission by reducing shocks transferred to the gearbox,
• improvement of gear shifting comfort and smoothness when starting off.

Thanks to the use of a multi-stage spring system and precisely selected inertia, this dual-mass flywheel helps maintain the acceleration uniformity and predictable drivetrain behavior characteristic of BMW. A properly selected component within Clutch Kits also reduces the risk of premature wear of the clutch disc and synchronizer elements.

Condition, origin, and benefits of choosing a used part

The offered component is in used condition, which allows for reduced repair costs while maintaining the manufacturer's original specifications. For a dual-mass flywheel, choosing a part sourced from a dismantled BMW vehicle is often preferred by workshops that prioritize compliance with factory parameters and proper fitment for a specific engine generation.

Used clutch system components, when properly verified and installed, can represent a reasonable compromise between cost and durability. Especially in vehicles used intensively, where quick availability of parts and maintaining original operating characteristics are important, such a solution is frequently chosen by professional service centers.

Installation and maintenance recommendations

When replacing the dual-mass flywheel in B46/B48 engines, a comprehensive approach to clutch system maintenance is recommended. In workshop practice, the installation of this element is often combined with the inspection or replacement of the clutch disc, pressure plate, and release bearing to avoid the need for re-removing the gearbox in the near future. Proper installation requires adhering to the tightening torques specified in BMW service documentation and thoroughly cleaning the contact surfaces with the crankshaft and clutch disc.

After installation, it is worth paying attention to:

• the absence of unusual vibrations when starting off and at low RPM,
• smooth gear engagement under load,
• stable engine operation in the city driving RPM range.

Such symptoms are a good indication that the selected dual-mass flywheel is working correctly with the other components of the system.

Expanding the BMW clutch system

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other components from the same group, such as clutch discs, pressure plates, or release bearings, check the available parts in the BMW Clutch Kits category.

For users who are also considering the use of used control modules or sensors in their vehicle, a practical guide on selecting and installing automotive electronics may be helpful – you can find it in the article about used automotive electronics and ECU modules.