BMW S55 Crank Hub Fix

BMW S55 Crank Hub

The crank hub issue is a specific concern associated with the BMW S55 engine, which is prominently featured in high-performance models like the F80 M3, F82/F83 M4 and F87 M2 competition. This problem revolves around the crankshaft's harmonic damper, commonly referred to as the crank hub and its connection to the crankshaft.

The S55 engine employs a crank hub design that incorporates both the crankshaft and the harmonic damper into a single unit. The crank hub is responsible for minimizing vibrations and harmonics generated during engine operation. However, reports and experiences from BMW owners have highlighted a vulnerability in the original design, specifically related to the connection between the crankshaft and the harmonic damper.

Over time, owners and enthusiasts have reported instances of the crank hub experiencing failures, including shearing, spinning or becoming detached from the crankshaft. This issue can lead to significant engine damage, such as misalignment of engine components, loss of power, and in extreme cases, complete engine failure.

To address this concern, some BMW owners have chosen to proactively replace the stock crank hub with upgraded aftermarket solutions that feature improved materials and design, aiming to enhance the durability and longevity of this critical engine component. We at Paddock Performance have developed a single peice crank hub design to eliminate the issue. The upgraded version utilize stronger materials and a more robust construction to reduce the risk of failure.

It's important for BMW S55 engine owners to stay informed about potential issues like the crank hub problem and to address them promptly through preventive measures. Regular maintenance and monitoring of engine performance are crucial in ensuring the reliability and longevity of the S55 motor. The spinning Crank hub issue is more common in tuned vehicles, however, we have seen the same issue in standard thoroughly maintained examples.