Crankshaft Harmonic Balancer, BMW - F8X M2/M3/M4, S55

This part is listed by BMW as BMW part number 11237853850 (11 23 7 853 850) and is described as the front crankshaft pulley - aka vibration damper or harmonic balancer - for the S55 engine found in F87 M2, F80 M3, and F82/F83 M4. This pulley doesn't have a replacement interval but it a crucial piece to keep an inline-6 crankshaft spinning happily. Any damage, wear, or corrosion is grounds for a new pulley.

This is a Genuine BMW S55 harmonic balancer with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.

For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.