RK Autowerks 4 Pin Crank Hub, BMW N55 / S55

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