OEM Replacement Crankshaft Bolt for MINI N14 and N18 Engines
The crankshaft bolt is one of the most critical fasteners in the MINI N14 and N18 engine. It secures the crankshaft pulley and harmonic damper assembly to the crankshaft and maintains proper clamping force under extreme engine loads.
This is a genuine OEM-style torque-to-yield (TTY) crankshaft bolt designed for single-use installation. Because the bolt stretches during the final torque procedure, MINI specifies replacement any time the bolt is removed.
Whether you're performing timing chain service, replacing the front main seal, installing a harmonic damper, or rebuilding an engine, a new crankshaft bolt is mandatory for proper assembly.
Why Replace the Crankshaft Bolt?
• Torque-to-yield design requires replacement after removal
• Maintains proper crank pulley clamping force
• Helps prevent pulley movement and timing issues
• Required during timing chain service
• Ideal for engine rebuilds and front cover repairs
Common Services Requiring a New Crank Bolt
• Timing chain replacement
• Front crankshaft seal replacement
• Harmonic damper replacement
• Engine rebuilds
• Front timing cover service
Fits:
• MINI Cooper S N14 Engines
• MINI Cooper S N18 Engines
Applications:
• R55 Clubman S
• R56 Cooper S
• R57 Cooper S Convertible
• R58 Cooper S Coupe
• R59 Cooper S Roadster
• R60 Countryman S
• R61 Paceman S
SneedSpeed Recommendation
Never reuse a removed crankshaft bolt. The factory bolt is designed to stretch during installation and reusing it can reduce clamping force, potentially leading to pulley movement, timing issues, or engine damage.
Whenever servicing the front of the engine, we recommend replacing the crankshaft bolt along with the front main seal and installing a SneedSpeed Cryo-Treated Timing Chain Kit for maximum reliability.
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