BMW N55/S55 Engine Crank Hub Bolt Capture Kit – Prevents Crank Hub Slip, Secures Timing & Adds Engine Protection

Protect your build from one of BMW’s most infamous weak points.

Our Crank Hub Bolt Capture Kit is engineered for N55 and S55-powered BMWs to help prevent crank hub slip, protect engine timing, and add peace of mind for tuned and hard-driven cars.

From the factory, the crank hub setup on these engines can allow the crank bolt to loosen or the hub to micro-slip under high load, hard downshifts, or repeated launches. When that happens, timing can jump—leading to misfires, loss of power, or in the worst cases, catastrophic engine damage.

This kit is designed to mechanically “capture” the crank bolt, locking it in place so it can’t unwind under vibration or shock. Once installed, the bolt is effectively trapped, dramatically reducing the risk of rotation and timing drift vs. a stock-style setup.

Whether your car is stage 1, full bolt-on, or regularly sees track days, this is one of the smartest preventative upgrades you can do on an N55 or S55 platform.

Why You Need a Crank Hub Bolt Capture Kit

• Helps prevent crank hub slip on high-torque, hard-used N55/S55 engines
• Keeps timing locked in place under hard acceleration, track driving, or repeated launches
• Ideal for tuned cars running higher boost, sticky tires, or aggressive downshifts
• Cheap insurance compared to the cost of a timing failure or full engine rebuild

How It Works

• The kit installs over the factory crank bolt, creating a positive mechanical lock.
• Once torqued to spec, the capture plate/bolt interface prevents bolt rotation, even under shock loads.
• Works with the OEM crank hub (or upgraded hub, depending on build) as an added layer of security.

(Exact installation steps and hardware style may vary slightly by application—always follow the included instructions or have a trusted BMW specialist perform the install.)

Key Features

• Engine Protection First: Built specifically to address crank bolt movement and timing slip risk on N55 & S55 engines.
• Precise CNC Construction: Manufactured from high-strength material for a precise fit and long-term durability.
• Track & Street Proven: Designed with tuned and performance-driven cars in mind—perfect for daily-driven builds and weekend track cars.
• Works with OEM or Built Setups: Suitable for stock or modified engines, upgraded turbos, and higher-boost tunes.
• OEM+ Friendly: Hidden once installed; keeps your engine bay looking factory while adding serious protection underneath.

INSTALL NOTES

• Professional installation strongly recommended—this job requires front-end disassembly and access to the crank bolt.
• Always use new OEM crank bolt and one-time-use hardware where required by BMW.
• Verify torque specs and procedures for your specific engine (N55 vs S55) and follow a proven install guide.
• Ideal to perform this upgrade alongside other front-end or engine-out work (rod bearings, turbos, oil pan gasket, etc.) to save on labor.

FITMENT:

Designed for N55 and S55 engines only

Not compatible with N54, N52, B58, S58 or diesel engines

• BMW 1 Series – E82, E88 (2010–2013) including: 135i (N55)
• BMW 1 Series – E82, E88 (2012–2013) including: 135is (N55)
• BMW 1 Series – F20, F21 (2012–2015) including: M135i (N55)
• BMW 1 Series – F20, F21 LCI (2015–2016) including: M135i (N55 LCI)
• BMW 2 Series – F22, F23 (2013–2016) including: M235i (N55)
• BMW 3 Series – E90, E91, E92, E93 (2010–2013) including: 335i (N55)
• BMW 3 Series – F30, F31 (2011–2015) including: 335i (N55, RWD & xDrive)
• BMW 4 Series – F32, F33, F36 (2013–2016) including: 435i (N55, RWD & xDrive)
• BMW 5 Series – F10, F11, F07 (2009–2017) including: 535i (N55, RWD & xDrive)
• BMW X3 – F25 (2010–2017) including: X3 xDrive35i (N55)
• BMW X4 – F26 (2014–2016) including: X4 xDrive35i (N55)
• BMW X5 – E70 (2011–2013) including: X5 xDrive35i (N55)
• BMW X5 – F15 (2014–2018) including: X5 xDrive35i (N55)
• BMW X6 – E71 (2011–2014) including: X6 xDrive35i (N55)
• BMW X6 – F16 (2014–2019) including: X6 xDrive35i (N55)
• BMW X1 – E84 (2012–2015) including: X1 xDrive35i (N55)
• BMW M2 Competition – F87 (2018–2020) including: M2 Competition (S55)
• BMW M3 – F80 (2014–2018) including: M3 (S55), M3 Competition (S55, 2016–2018)
• BMW M4 – F82, F83 (2014–2020) including: M4 (S55), M4 Competition (S55, 2016–2020)

BAVMODS Part No: BAV000033F

Please refer to the “Fitment” section in the product description for compatibility details.