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Cottered cranks

  • 13-02-2012 9:09pm
    #1
    mcgratheoin
    Registered Users, Registered Users 2 Posts: 1,461 ✭✭✭


    I know this has been asked before with no success, but it's been a while....
    I'm in the process of stripping a bike for a rebuild and it has cottered cranks - does anybody out there have a cotter press to get these off or am i reduced to a hammer/vice solution?


Comments

  • #2
    victorcarrera
    Registered Users, Registered Users 2 Posts: 1,059 ✭✭✭victorcarrera


    I've never needed to use anything stronger than a lump hammer and punch but support the crank first.


  • #3
    Mycroft H
    Registered Users, Registered Users 2 Posts: 9,313 ✭✭✭Mycroft H


    mcgratheoin wrote: »
    I know this has been asked before with no success, but it's been a while....
    I'm in the process of stripping a bike for a rebuild and it has cottered cranks - does anybody out there have a cotter press to get these off or am i reduced to a hammer/vice solution?

    Hammer usually does it. Make sure you use a pipe to support the crank so you don't wreck the bottom bracket. Use a claw hammer and don't be afraid to give it a good smack ( when I say a good smack, I mean a full force smack, none of that gently tap tap tap stuff. :D)


  • #4
    Doctor Bob
    Registered Users, Registered Users 2 Posts: 1,141 ✭✭✭Doctor Bob


    mcgratheoin wrote: »
    hammer/vice solution

    https://www.youtube.com/watch?v=GQDU-2qMre0


    Problem solved! :P


  • #5
    Elmar Fudd
    Closed Accounts Posts: 38 ✭Elmar Fudd


    Sure I have a cotter press - in D8.


  • #6
    mcgratheoin
    Registered Users, Registered Users 2 Posts: 1,461 ✭✭✭mcgratheoin


    Elmar Fudd wrote: »
    Sure I have a cotter press - in D8.

    Elmar, would you be amenable to popping out two pins for me, or do you reckon that the hammer option would work easily enough bearing in mind that I probably don't want to reuse the bracket.


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  • #7
    Elmar Fudd
    Closed Accounts Posts: 38 ✭Elmar Fudd


    It might be best to try the cotter press first because a hammer might just bend or break the threaded end and then the cotter press won't work on it. You can borrow the tool, I don't use it much. I will PM you my text number etc.


  • #8
    07Lapierre
    Registered Users, Registered Users 2 Posts: 8,309 ✭✭✭07Lapierre


    Elmar Fudd wrote: »
    It might be best to try the cotter press first because a hammer might just bend or break the threaded end and then the cotter press won't work on it. You can borrow the tool, I don't use it much. I will PM you my text number etc.

    The trick is to undo the Nut on the cotter pin,until the nut is "flush" with the top of the tread. Leave the nut in this position and then hit it a "Sharp Blow" with a hammer (a Plastic Mallet would be better). Leaving the nut in place will protect the treads.


  • #9
    tomasrojo
    Registered Users, Registered Users 2 Posts: 11,852 ✭✭✭✭tomasrojo


    If you don't have a soft mallet, maybe try a piece of soft wood between the hammer and the pin.


  • #10
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,567 Mod ✭✭✭✭Capt'n Midnight


    As long as it hasn't rusted in, removing the nut and washer and then taking a short spin on the bike generally loosens them up.


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