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