BMW N55 Bulletproof Crank Kit - the proven N55 crank hub fix, crank bolt capture and crank seal plate solution for reliability, performance and peace of mind.
If you drive a BMW N55 turbo straight six, you already know the story. Incredible performance, silky smooth power delivery - and well documented issues that can ruin an engine. This complete N55 reliability kit addresses the big ones: crank bolt backing out, keyless crank hub slip, and serpentine belt ingestion through the front main seal. It is the best value N55 crank hub prevention package for fast road, track day and tuned cars, as well as daily drivers seeking OEM-plus reliability.
Built around a Vargas Turbo Crank Bolt Capture and Vargas Turbo Crank Seal Plate, plus a full front-end service with new OEM belt drive, fresh oil, filter and coolant, this is a comprehensive N55 reliability upgrade. We have installed this package on customer N55 builds and feedback has been excellent. Customers report rock-solid timing stability and real confidence to push on without the fear of crank hub slip or belt debris in the oil system.
Why you need this N55 crank hub fix
- Crank bolt and hub movement - the factory keyless hub design can allow the crank bolt to loosen and the hub to slip, risking piston-to-valve contact and catastrophic engine damage.
- Serpentine belt ingestion - a failed belt can wrap around the harmonic balancer and get pulled past the front main seal, sending rubber into the oil pan and clogging the pickup, causing oil pressure loss.
- Oil filter housing gasket leaks - common on N55. Old, brittle gaskets leak oil, can mix oil and coolant, and compromise lubrication and cooling.
How this kit solves it
- Vargas Turbo Crank Bolt Capture - locks the crank bolt to the hub and damper to stop it backing out under high load, hard launches and aggressive shifting.
- Vargas Turbo Crank Seal Plate - seals the gap behind the damper to help prevent belt debris being drawn past the front main seal and into the sump.
- Complete belt drive refresh - new OEM accessory belt, tensioner and idler pulleys for dependable operation and quieter running.
- Service items included - quality oil, filter and coolant to complete the job correctly and protect your N55.
Kit contents
- Vargas Turbo Crank Bolt Capture
- Vargas Turbo Crank Seal Plate
- OEM Accessory Belt
- OEM Belt Tensioner and Idler Pulleys
- Liqui-Moly Longtime High Tech Engine Oil 5w-30 - 7 litres
- OEM Hengst Oil Filter
- OEM Oil Filter and Oil Cooler Housing Gaskets
- ECS Oil Change Sticker
- Genuine BMW Full-Strength Coolant - 1 litre
Benefits
- Best practice N55 crank hub fix and prevention in one box
- Ideal for stock, stage 1, stage 2 and big turbo N55 builds
- Reduces risk of timing shift, crank hub slip and engine failure
- Prevents serpentine belt ingestion and oil pickup blockage
- Fresh belt system and gaskets for leak-free, quiet running
- Great value compared with the cost of a rebuild
Maintenance tip: Oil filter housing gaskets should be replaced every 40,000 to 60,000 miles on the N55. This kit includes new gaskets to address that known weak point.
Perfect search terms for what this kit delivers
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Vehicle fitment - BMW N55 3.0 turbo
- BMW F22 M235i N55 3.0L
- BMW F22 M235i xDrive N55 3.0L
- BMW F23 M235i N55 3.0L
- BMW F23 M235i xDrive N55 3.0L
- BMW F30 335i N55 3.0L
- BMW F30 335i xDrive N55 3.0L
- BMW F30 ActiveHybrid 3 N55 3.0L
- BMW F32 435i N55 3.0L
- BMW F32 435i xDrive N55 3.0L
- BMW F33 435i N55 3.0L
- BMW F33 435i xDrive N55 3.0L
- BMW F34 335i xDrive N55 3.0L
- BMW F36 435i N55 3.0L
- BMW F36 435i xDrive N55 3.0L
- BMW F87 M2 N55 3.0L
Installation and support
Professional fitting available at Nforcd in Warwickshire. Get a tailored installation quote and lead time - email Sales@nforcd.com.
Buy with confidence: This N55 Bulletproof Crank Kit is a smart, preventative upgrade that our N55 customers love. If you are searching for the best N55 crank hub fix in the UK, this is the reliable, track-proven solution that keeps your BMW performing the way it should.