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  1. #1
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    remove a stripped crank arm?

    Due to inattention on my part, I managed to strip the threads of my Campy crank where the removal tool threads in. This means I can't remove the crank arm, and naturally it's on the drive side.

    Any hints how to remove it non-destructively?
    I thought of an automotive pulley puller, but since the crank spider has five spindles, the pully puller won't grab.
    I've tried propping the bike up and resting the spider on a couple of 2x4s and gently tapping on the bb axle with a rubber mallet and a bolt. Didn't work, and maybe I'm too afraid of bending or breaking something to give it adequate force.

    It doesn't look like a job for a helicoil.

    Help?

  2. #2
    Asshat skingry's Avatar
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    I have the same problem on one of my bikes, but I still haven't had to pull the crank (sealed BB). A two prong puller wouldn't work?
    Ride bikes, listen to SLAYER.

  3. #3
    Your mom
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    There have been 3-4 threads on this in the past 9 months. Do a search. Options include: Bearing puller, destruction, and a crazy technique with a socket on a cement floor.

  4. #4
    uberNEWB dzinehaus's Avatar
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    Be Happy, Live Life, Be Strong ~j.michaud / dzinehaus

  5. #5
    Senior Member
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    Quote Originally Posted by tellyho
    There have been 3-4 threads on this in the past 9 months. Do a search. Options include: Bearing puller, destruction, and a crazy technique with a socket on a cement floor.

    Hey, I resemble that comment. By the way, the method works very well.

    Find a socket that just fits inside the square of the crank arm.

    Put the socket on a cement floor.

    Place the bike over the socket so the socket is inside the square of the crank arm. Have someone hold the bike.

    With a flat punch and a BFH (big f@cking hammer), hammer on the crank arm as close as you can to the bottom bracket. Put a big flat washer between the punch and the crank arm to protect the soft metal.
    Il faut de l'audace, encore de l'audace, toujours de l'audace

    1980 3Rensho-- 1975 Raleigh Sprite 3spd
    1990s Raleigh M20 MTB--2007 Windsor Hour (track)
    1988 Ducati 750 F1

  6. #6
    Hammer Time C_LOGAN's Avatar
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    Another way is to ride the bike until the crank comes loose... Just make sure you check every once and a while to see whether it is loose, as riding with a loose crank can damage it even more - that is if you want to keep the crank.

    Make sure you leave the screw in, so the crank doesn't just fall off - and ride carefully. I have never had to do this, but I read somewhere that it works.

  7. #7
    Your mom
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    Crazy good, not crazy bad.

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