Twin Mass BMW E81 E87 E90 LCI 116d N47 Diesel Dual Flywheel

Twin Mass BMW E81 E87 E90 LCI 116d N47 Diesel Dual Flywheel is an original drivetrain component, designed specifically for N47 diesel engines in 1 and 3 series models. Thanks to its dual-mass design, it effectively reduces torsional vibrations, improving the engine's refinement and driving comfort. This used, fully functional flywheel is a practical solution for drivetrain repairs in BMW cars with a Diesel engine.

Specifications and technical data

• SKU: 8631807-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8631807
• Substitutable numbers: 21208631807, 8631807, 21207615627, 7615627, 21207628091, 7628091, 21207637279, 7637279, 21207577479, 7577479, 21207567829, 7567829, 245085, KZ
• Fuel type: Diesel
• Category: Flywheels & Flexplates

Purpose and function in the drivetrain

The Twin Mass BMW E81 E87 E90 LCI 116d N47 Diesel Dual Flywheel operates between the crankshaft and the clutch, dampening rotational irregularities typical of diesel units. The use of a dual-mass design allows for:

• reduction of vibrations transmitted to the gearbox and body,
• noise reduction in the cabin at low and medium RPM,
• smoother starting and gear shifting,
• relief for gearbox and clutch components.

As a result, the drivetrain in BMW 1 and 3 series with a diesel engine operates more stably, and the driver experiences significantly higher driving comfort in daily use.

Compatibility with the N47 Diesel unit

The presented flywheel has been developed with the specifics of the N47 Diesel engine in mind, which generates high torque at low RPM. Properly selected damping characteristics allow for effective absorption of torsional loads, which is important for both the durability of the gearbox and the comfort of the entire drivetrain.

The original BMW origin ensures the maintenance of factory operating parameters, proper balance, and fitment with the engine accessories and clutch intended for this power unit.

Characteristics of the used dual-mass flywheel

As an item in the Flywheels and gears category, the product is used, which provides a cost-effective alternative while maintaining the manufacturer's original specifications. This type of part is particularly attractive for maintenance repairs when the priority is combining a reasonable price with maintaining the correct operating parameters of the drivetrain.

A dual-mass flywheel of this type will prove useful in situations where the existing component shows signs of wear, such as excessive vibration, knocking when changing loads, or reduced engine operating comfort. Replacing it with an original BMW component allows you to restore the proper operation of the drivetrain without the need to use replacements with uncertain parameters.

Application in service and tuning

During service work related to the clutch and gearbox system in a BMW 116d with an N47 engine, it is worth considering a simultaneous inspection of the dual-mass flywheel's condition. Replacing it with a verified, used OEM component can be a reasonable compromise between costs and maintaining the factory characteristics of the drivetrain.

If you are interested in a broader context of using used components in modifications and repairs, check out the article The best used parts for tuning your car, which discusses a practical approach to selecting used components.

Expansion of the system within BMW flywheels

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 flywheels, gears, or related mounting components, check the available parts in the BMW flywheels and gears category.