Single Mass Flywheel Conversion Kit - E46 323i/325i/328i/330i, E39 525i/528i/530i, Z3

Single Mass Flywheel Conversion Kit for M52TU and M54 Engine in E46 323i/325i/328i/330i, E39 525i/528i/530i, and Z3 non-M 2.3/2.5/2.8/3.0. This kit comes complete with everything you need to eliminate the troublesome dual mass flywheel and replace it with a more reliable single mass flywheel and sprung hub clutch.

The single mass flywheel in this conversion kit does away with the complex dual mass damper system. It's a solid steel flywheel like older model BMWs had from the factory. It is not a lightweight aluminum flywheel like we sell for track or race cars. This kit is intended for daily driver street use as an OEM alternative to the expensive factory flywheel. Valeo's goal was to maintain OEM levels of drivability and operation. Because the DMF is eliminated, transmission rattle noises may be more noticeable and could be irritating to some owners. However, there is actually a small improvement in clutch feel and operation that will be welcomed by many others. The flywheel weighs 24lbs and the entire assembly weighs less than 40lbs (roughly the same as the stock assembly).

The clutch kit is specifically built to work with this flywheel. Valeo has cleverly transferred the damper system from the flywheel to the clutch assembly. Under this system the flywheel/clutch unit still absorbs driveline vibration much like the original dual mass flywheel. But without the extra complexity and cost of the DMF. When this clutch wears out you are less likely to also have to replace the flywheel.

Signs of a failed BMW DMF include: build-up of clutch material or damage to the clutch contact surface, excessive play between the two halves of the DMF (if the outer flywheel section can rotate more than 20mm in either direction), and grease leaking out from inside the flywheel assembly. A worn DMF does not just impact performance or clutch operation, it's a big safety issue as well. A DMF that breaks apart can be catastrophic to the transmission as well as dangerous to the driver and passenger.

This kit is manufactured by Valeo, an OEM supplier to BMW for some clutch components as well as many other parts and systems. All parts in this kit come with a two year warranty.

This kit (#52401220) has all of the same clutch components as the other Valeo kit (#52401225) but the flywheels are different. We prefer to sell this kit because it has more applications and has a strong sales history among all of the models listed below. This kit uses a 240mm clutch disc - the same as a stock 330i and is an upgrade over the 228mm disc found in 323i/325i/525i.

This kit includes everything you need for a BMW dual mass flywheel conversion:

• single mass flywheel (replaces BMW #21217512474)
• clutch kit (disc, pressure plate, throw out bearing) (replaces BMW #21207531843 and 21217523620)
• pressure plate bolts
• flywheel bolts
• alignment tool

IMPORTANT Fitment notes: 

E46 325i/330i 5-speed only up to 8/2003 production date. Cars built from 9/2003 have a 22-spline input shaft which this kit is not compatible with.

Not for 6-speed or SMG transmissions.