RK Autowerks 4 Pin Crank Hub, BMW N55 / S55 (F8X)

Eliminate Crank Hub Failure on Your N55/S55 with RK Autowerks’ 4-Pin Solution

 

Crank hub issues have plagued BMW N55 and S55 engines for over a decade—causing crankshaft spin, timing drift, and costly internal damage. RK Autowerks answers this problem with a precisely engineered fix: the RK 4-Pin Crank Hub.

 

CNC machined in-house at RK’s Texas facility and made from heat-treated 4130 Chromoly steel, this crank hub offers unmatched durability and precision. The 4-pin design prevents the valve timing and oil pump chains from spinning independently, locking the crank hub to the crank nose for rock-solid alignment and long-term reliability—even on high-horsepower builds.

 

Developed by Raza and the RK team, this hub has been laser scanned for perfect fitment and is a direct replacement for the OEM part. Whether you're running a stock engine or a heavily modified setup, this upgrade is a must-have for peace of mind and performance.

 

Key Features:

 

CNC machined from heat-treated 4130 Chromoly

4-pin design locks the crank hub to the crankshaft

Eliminates timing inconsistencies and crank spin

Perfect fitment verified via laser scanning

Designed and manufactured in the USA

Direct OEM replacement for N55 and S55 engines

The comprehensive kit includes the following components:

 

One-piece crank hub/timing gear

Keyed oil pump gear

Drill bit

Drill guide

BMW N55 Applications:

 

1 Series

 

2010-2013 E82/E88 135i

2012-2016 F20/F21 M135i

 

2 Series

 

2014-2016 F22/F23 M235i

2016-2018 F87 M2

 

3 Series

 

2010-2015 E90/E91/E92/E93 335i

2012-2015 F30/F31/F34 335i

2015-2016 F30/F31 340i

 

4 Series

 

2013-2016 F32/F33/F36 435i

2016 F32/F33/F36 440i

 

5 Series

 

2010-2016 F10/F11 535i

2010-2017 F07 535i GT

 

6 Series

 

2011-2018 F12/F13/F06 640i Gran Coupe

 

7 Series

 

2012-2015 F01/F02 740i / 740Li

 

X1 Series

 

2013-2015 E84 X1 xDrive35i

 

X3 Series

 

2011-2017 F25 X3 xDrive35i

 

X4 Series

 

2014-2017 F26 X4 xDrive35i

2016-2017 F26 X4 M40i

 

X5 Series

 

2011-2018 E70/F15 X5 xDrive35i

 

X6 Series

 

2011-2019 E71/F16 X6 xDrive35i

 

ALPINA N55 Applications:

 

B3 Series

 

2013-2018 F30/F31 B3 Bi-Turbo

 

B4 Series

 

2014-2019 F32/F33 B4 Bi-Turbo

 

B5 Series

 

2010-2016 F10 B5 Bi-Turbo

 

B6 Series

 

2011-2018 F12/F13/F06 B6 Bi-Turbo Gran Coupe

 

BMW S55 Applications:

 

2 Series

 

2018-2020 F87 M2 Competition

 

3 Series

 

2012-2018 F80 M3

 

4 Series

 

2014-2020 F82 M4

2014-2020 F83 M4