S55 Crank Hub Failure & The Solution

The BMW S55 is a force to be reckoned with. However, like any complex piece of machinery, it is not without its flaws. One of the biggest issues that S55 owners face is crank hub failure. This video will explore what causes this problem and discuss the solution.


What is the S55 crank hub failure?

The crank hub is a critical component of the engine that connects the crankshaft to the camshaft. It plays a crucial role in synchronizing the engine's valves and pistons. Unfortunately, in some S55 engines, the crank hub can fail, leading to catastrophic engine damage.

What causes the crank hub failure?

The main cause of the S55 crank hub failure is a design flaw in the original crank hub. The stock crank hub is made from a 3 piece design held together with small friction washers, which can fail under high RPM or even idling in your driveway. This failure can result in the crankshaft and camshaft becoming out of sync, causing catastrophic engine damage.

What is the solution?

To address the crank hub failure issue, aftermarket companies have developed upgraded crank hubs that are designed to be more robust and reliable. These upgraded crank hubs are made of high-quality materials and feature a single-piece design that provides increased strength and durability and eliminates the potential of a separate piehttps://youtu.be/lFMIcpgGRtsce spinning independently of one another

A standard Crank Hub kit includes a precision-machined crank hub, a new crank bolt, and all the necessary hardware for installation. The 4-pin locating system ensures correct orientation during installation. 

By upgrading to an aftermarket crank hub, S55 owners can remove the risk of crank hub failure and the associated engine damage. It is a proactive step that provides confidence to all S55 owners. 


The S55 crank hub failure is a known issue that can have serious consequences for BMW owners. However, with the availability of aftermarket solutions there is a reliable and effective solution to this problem. By investing in an upgraded crank hub, S55 owners can ensure the longevity and performance of their engines.