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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 06-26-07, 09:31 AM   #1
SeattleTom
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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?
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Old 06-27-07, 03:08 AM   #2
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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?
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Old 06-27-07, 05:56 AM   #3
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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.
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Old 06-27-07, 06:04 AM   #4
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http://parktool.com/repair/printhowto.asp?id=136
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Old 06-27-07, 09:13 AM   #5
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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.
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Old 06-28-07, 02:52 AM   #6
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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.
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Old 06-28-07, 07:21 AM   #7
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Crazy good, not crazy bad.
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