Mountain Bike Crank Arm Keeps Coming Loose

Once a crank bolt comes loose and the crank arm is damaged from riding with the bolt loose loctite will not help out. If you found a piece of metal over the crank arm bolt which let you see the bolt but not remove it this is a self extracting bolt assembly. If the arm is damaged no matter how tight the bolt is torqued it will not stay tight on the spindle.

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The splines on the crank arm can be ovalized or otherwise damaged if ridden when loose.

Mountain bike crank arm keeps coming loose. You can try locktite but i ve had no success with that either. The bolt pushes against the metal piece as it unscrews forcing the crank. A loose or det. When the crank arm is loose and you pedal with it you damage the four corners of it s socket that rest in the axle.

Best bet is to have the left hand arm replaced. Somehow this damage causes the crank arm to wiggle enough to unscrew the nut little by little until it just falls off again. Take the bolt and the washer behind it from the non drive side and use them to re attach the drive side crank arm. Put it back in and it shouldn t come loose.

Only thing that would keep a damaged crank arm on is jb weld. You will have no choice but to replace it. The non drive side crank may stay put at least temporarily without a bolt through it but don t put pressure on it as you ride as this will loosen it quickly. A short video on how to reattach and tighten a bicycle crank arm.

Take the screws out and apply a drop to whichever one is coming loose. Re torqueing the bolt will keep the arm on for a short amount of time but eventually will critically damage the crank arm bolt. The video shows the consequences of buying a very cheap second hand bicycle. But i have seen many that haven t had a torque wrench used and they usually come in for either a crank arm replacement or a crank set install.