NOTE: There is no drilling into the crankshaft required to install this kit.

What is a Crank Hub?

Issues relating to the standard three-piece crank hub on the S55 engine are widely known, but these are fully addressed with the installation of the MMR Performance one-piece billet crank hub and capture plate.

The OE units friction plate are known to slip, causing the timing to alter enough that piston-to-valve contact can occur and, if not totally standard and within the warranty period, leaves owners with a very expensive repair bill!

MMR have become know of this problem, having experienced this issue twice themselves, so they were committed to develop a product that would ensure owners of standard power outputs have complete peace of mind, as much as those that wish to increase the power and torque output without having to worry; MMR have engineered the most comprehensive solution on the market and at one of the most compelling price points. 

The MMR Performance one-piece crank hub is machined from billet EN36 that's been heat-treated with a 0.75mm case hardening, making it incredibly strong and durable. 

The one-piece design ensures the friction plates can't slip and with a new crank bolt tightened appropriately, this alone delivers a substantial improvement in reliability versus the OE version.

For the ultimate solution, which then also removes the possibility for this bolt to be able to loosen, MMR have engineered an additional billet aluminium capture plate that securely houses the whole head of the crank bolt, making it impossible for it to come undone.  

Careful design has also allowed MMR to develop a solution that's easy to install compared to some other products as there's no drilling or modification required to the OE crankshaft, which saves you time and ultimately money, too.

Why do I need it?

If your BMW M3 F80, M4 F82, F83 or M2 Competition F87 S55 is modified or heavily modified installing the MMR Crank Hub is highly recommended. A spun crank can lead to engine failure with repair costs in excess of $20,000 or if slightly luckier broken down until vehicle is sent back to dealer or workshop for the crank hub to be replaced anyway and the engine retimed.

The SCH (Spun Crank Hub) failure has been seen on both stock and modified S55 engines. If you are modifying your car, doing track work or driving hard then upgrading the crank hub in your S55 powered M car is a fail safe you will not regret.

100% Bulletproof.

As it stands there is a 100% success rate of the MMR Crank Hub.

 MODE x MMR Performance Crank Hub Bundle Includes:

• MMR Performance Crank Hub (Part No. MMR20-1003FK)

• MMR Crank Bolt Capture (Part No. MMR20-1002)

• Genuine BMW Parts OEM Crank Bolt (Part no. BM-11217614270)

• Genuine BMW Parts OEM Valve Cover Gasket (Part no. BM-11127587804)

• Genuine BMW Parts OEM Cam Bolts (2) (Part no. BM-11367524954)

• Genuine BMW Parts OEM Engine Inspection Plug (2) (Part no. BM-11117849396)

• Genuine BMW Parts OEM Front Main Seal (Part no. BM-11118618864)

• Genuine BMW Parts OEM Brake Booster Vaccum Pump Seal Cap (Part no. BM-11117530262)

• Genuine BMW Parts OEM Oil Pump Chain Tensioner Access Cap (Part no. BM-11117615131)

• Genuine BMW Parts OEM Sump Gasket (Part no. BM-11137600482)

• Genuine BMW Parts OEM Sump Bolts (Part no. BM-11132210959)

• MAHLE or MANN Filter Oil Filter

Installation:

Installation of any crank hub solution is extensive and must be carried out by highly qualified technicians only, the oil pan, valve covers, subframe, steering and suspension must be removed and re-installed. BMW-Specific specialty tools are required in order to set the engine cam and valve timing.

WARNING: Improper installation may cause irreversible engine damage.

Please Click Here to locate a dealer in your area.

Installation Tips:

1. This is a great time to upgrade your turbos as everything is out of the way, Click here to browse our range of upgraded Pure Turbos.
2. For high output or high km builds it is also a great time to replace the rod bearings, everything is out of the way and ready to go for a very quick and easy installation.
3. Many components, bolts and hardware are single-use only, please ensure no bolts are re-used during this installation that should not be.
4. The oil system must be primed prior to re-starting the engine due to the crankcase being opened up and pressure being released.

Applications:

• BMW M3 F80 (2014-2018)

• BMW M3 F80 Competition (2016-2018)

• BMW M4 F82/F83 (2014-2020)

• BMW M4 F82/F83 Competition (2016-2020)

• BMW M4 GTS (2016)

• BMW M2 CS (2020)

• BMW M2 Competition F87 (2018-2020)

Recommended Specialty Items:

• Crankshaft Alignment S55 Timing Tool Kit

Supplemental Kit Instructions (To use as a guideline)

ATTENTION: MODE Auto Concepts, MMR Performance assume no liability on the use or improper installation of this product. Product is for off-road / racing use only.