BMW E81 E87 E90 LCI 118d 318d Diesel N47 Solid Single Mass Flywheel Clutch Kit

BMW E90 318d N47 Solid Flywheel is a part from the Flywheels and Gears category, designed for BMW 3 Series E90 diesel units with the N47 engine. This used genuine part provides a solid foundation for repairing the drivetrain system in vehicles powered by Diesel fuel, ensuring stable clutch assembly operation.

Specifications and technical data

• SKU: 8631807-1
• 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 Technical Characteristics

The presented solid flywheel is dedicated to the clutch system in the BMW E90 318d model with the N47 engine, operating on diesel fuel. The solid design, unlike dual-mass solutions, ensures direct torque transfer from the crankshaft to the clutch disc, promoting precise drivetrain response and reducing the complexity of the entire assembly.

The component belongs to the group of flywheels and gears, responsible for stabilizing engine RPM and cooperating with the starter and clutch. Thanks to the use of appropriately selected mass and geometry, the flywheel supports the smooth operation of the diesel unit, reducing undesirable speed fluctuations.

Benefits of Using a Solid Flywheel

Choosing a solid flywheel for the BMW E90 318d N47 clutch system can be beneficial in terms of both durability and subsequent service. Compared to more complex solutions, the solid design:

• reduces the number of parts susceptible to wear and tear,
• simplifies the diagnosis of potential vibrations and noises in the drivetrain,
• promotes predictable clutch behavior during dynamic driving,
• can lower long-term costs of drivetrain servicing.

For users who value design simplicity and stable, repeatable drivetrain behavior, this solution is a practical choice, especially in vehicles used intensively or undergoing mechanical modifications.

Application in BMW N47 Diesel Engines

BMW N47 diesel engines are characterized by a specific operating culture and higher torque compared to gasoline units, which places greater demands on clutch system components. The solid flywheel cooperating with this engine has been designed to meet the loads typical for Diesel units, ensuring appropriate inertia and stable operation at low and medium RPM.

A properly selected flywheel is crucial for comfortable gear changes, smooth starts, and the overall drivetrain response to load. In the case of the BMW E90 318d N47, correct component selection for the specific engine version and clutch used is important for both durability and operational safety.

Condition, Origin, and Practical Application

The offered BMW solid flywheel comes from the aftermarket and is intended for reinstallation after prior verification of compatibility with the specific vehicle configuration. A used OEM component is a sensible choice for drivers who want to restore drivetrain functionality while maintaining the factory operating characteristics of the engine and clutch.

Due to the nature of the component, prior to installation, it is recommended to:

• check compatibility with the installed clutch kit,
• verify the condition of the working surfaces and the gear ring,
• have it installed by an experienced service specializing in the BMW brand.

BMW Flywheels and Gears – Selection and Project Development

If you are looking for other BMW flywheels and gears for your service or upgrade project, check out our dedicated category: BMW Flywheels and Gears. There you will find a wide selection of components tailored to various models and engine generations of this brand.

Tuning Inspirations and BMW Aftermarket

A solid flywheel can also be an interesting option for those who treat drivetrain modifications as part of a broader tuning project, based on proven aftermarket components. If you want to better understand how to use used parts in conscious tuning, check out the article: Best Used Parts for Tuning Your Car.

For users interested in the specifics of BMW diesel units and operating costs based on used parts, a comparison of popular engines of this brand may also be helpful: BMW N47 vs M57 / M57N / M57N2 – Ranking of Legendary Diesels. This will make it easier to assess how the selection of appropriate components, such as the flywheel, affects the durability and operating characteristics of the entire drivetrain.