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  1. #1
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    Big Problem! stripped thread from crank arm

    Hi all,

    I have a square tapered crank shaft. I was using the crank removal tool and accidentally stripped off all the threading from the left arm. What are my options in getting the arm off?

    The bottom bracket and the crankset are not needed. So they can be damaged in the removal process.

    Thank you!! Any suggestions are appreciated!

  2. #2
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    Is there room to slide a hacksaw blade in and cut off the spindle?

  3. #3
    Senior Member barba's Avatar
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    Try carefully riding the bike around. That may loosen it up a bit. They I would go for a wood block and a rubber mallet.

  4. #4
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    U could try a 2 arm gear puller

  5. #5
    Senior Member orangepaint's Avatar
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    Drill it out?

  6. #6
    WNG
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    Spin Forest! Spin! WNG's Avatar
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    +1 on the gear puller.
    Go to a FLAPS like Autozone, and see if they have a loner tool program.
    Get the 2 or 3 arm gear puller. A small one should do.

  7. #7
    Your mom
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    It's been covered, about once every other month. Do a search for the 4-5 methods out there.

  8. #8
    Lost in Nostalgia
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    Many times a small, thin, 3" cutoff wheel on a angle grinder will work wonders. Careful though you don't let it overrun and damage a good part.

    knotty

  9. #9
    Since 1938... JunkYardBike's Avatar
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    Quote Originally Posted by knotty View Post
    Many times a small, thin, 3" cutoff wheel on a angle grinder will work wonders. Careful though you don't let it overrun and damage a good part.

    knotty
    I found this at a garage sale for $1. I've been told it's probably a gear puller. Works like a charm, with a hell of a pop!

    Last edited by JunkYardBike; 10-23-07 at 04:34 PM.

  10. #10
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    Junkyardbike you are on it. I've got a puller very much like that one and have had to use it twice now on stripped arms. To the OP: Get/borrow one and don't be afraid to take a file to the crankarm if you have to make a notch or two so the puller can get a good bite. worke every time.

    John

  11. #11
    Lost in Nostalgia
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    JunkYardBike, that's a good puller, I have several OTC tools. My dad was a auto mechanic and machinist and left me with many good tools. Have several steel boxes of Snap-On pullers from a small 2" jaw to huge 16" jaws for stuff like pulling car flywheels off.

    knotty

  12. #12
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    Two options... use a hammer and a piece of wood.

    Second option. take the cups out... Probably u have room for the tools, just lose the cup little by little and the whole thing will come out. Im asuming square tapper ok?



    Quote Originally Posted by dmitri926 View Post
    Hi all,

    I have a square tapered crank shaft. I was using the crank removal tool and accidentally stripped off all the threading from the left arm. What are my options in getting the arm off?

    The bottom bracket and the crankset are not needed. So they can be damaged in the removal process.

    Thank you!! Any suggestions are appreciated!

  13. #13
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    Thanks to everyone! .. i went out and got a craftsman gear puller and a hacksaw (just in case). The gear puller worked fairly well, had a little difficulty gripping the crankarm with it.

  14. #14
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    There's another issue :

    I cannot for the life of me unscrew the right side of the BB . The lockring came out fine. Currently i sprayed the inside of the BB down with teflon lube, and tomorrow i'm planning to knock it a little with the hammer and try at it again. Any other suggestions?

    Maybe i'm turning it the wrong way? (right side of the bike, going clockwise to loosen)

    Thanks again! much appreciated!

  15. #15
    Senior Member Bill Kapaun's Avatar
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    Quote Originally Posted by dmitri926 View Post
    There's another issue :

    I cannot for the life of me unscrew the right side of the BB . The lockring came out fine. Currently i sprayed the inside of the BB down with teflon lube, and tomorrow i'm planning to knock it a little with the hammer and try at it again. Any other suggestions?

    Maybe i'm turning it the wrong way? (right side of the bike, going clockwise to loosen)

    Thanks again! much appreciated!
    It's a LEFT hand thread!

  16. #16
    Since 1938... JunkYardBike's Avatar
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    Quote Originally Posted by dmitri926 View Post
    There's another issue :

    I cannot for the life of me unscrew the right side of the BB . The lockring came out fine. Currently i sprayed the inside of the BB down with teflon lube, and tomorrow i'm planning to knock it a little with the hammer and try at it again. Any other suggestions?

    Maybe i'm turning it the wrong way? (right side of the bike, going clockwise to loosen)

    Thanks again! much appreciated!
    Which right side? Assuming this is a standard English threaded BB, the fixed cup (on the crankset side) loosens by turning clockwise. However, on the adjustable side (adjustable cup with lockring) it loosens by turning counter-clockwise.

    If it's Italian or French threaded, the fixed cup loosens counter-clockwise.

  17. #17
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    put the bolt in the spindle but leave it loose. throw locktite
    in there so it doesn't just fall out, or use duct tape over the hole
    you want to have it pretty loose

    go ride some steep hills pretty hard but expect the crank arm to loosen

    it will eventually loosen then you can take it off by hand

  18. #18
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    lol

  19. #19
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    Quote Originally Posted by edzo View Post
    put the bolt in the spindle but leave it loose. throw locktite
    in there so it doesn't just fall out, or use duct tape over the hole
    you want to have it pretty loose

    go ride some steep hills pretty hard but expect the crank arm to loosen

    it will eventually loosen then you can take it off by hand

  20. #20
    vasracer
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    Get some penetrating oil, Spray it on let it sit for an hour or two and repeat. This time tap it lightly with a hammer. The idea here is the first spray breaks down some of the rust, the second spray will work into the small nooks the first spray created. When it comes out and your ready to install the bottom bracket use anti-seize on the threads, This will prevent you from having this problem in the future.

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