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BB replacement

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  • 28-08-2016 2:18pm
    #1
    smacl
    Moderators, Society & Culture Moderators Posts: 15,754 Mod ✭✭✭✭


    BB on my hybrid died yesterday, and after a massive amount of grunting and groaning I've extracted the BB from the drive site. The cup on the non-drive side simply wont shift, and I'm just wondering can I leave it alone and put the new BB in from the drive side.

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    #2
    ford2600
    Closed Accounts Posts: 4,457 ✭✭✭ford2600


    Penetrating oil and some time.

    Threaded bar to hold tool tight against face of cup.

    Big bar and swing of it!


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    #3
    smacl
    Moderators, Society & Culture Moderators Posts: 15,754 Mod ✭✭✭✭smacl


    Series of whacks of a hammer on the back of the wrench, followed by lots of swearing, and a jury rigged contraption using the remains of the dead BB to hold the BB tool tight from the other side and she's out! Hateful things to remove.


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    #4
    07Lapierre
    Registered Users Posts: 8,248 ✭✭✭07Lapierre


    Left hand thread?


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    #5
    smacl
    Moderators, Society & Culture Moderators Posts: 15,754 Mod ✭✭✭✭smacl


    07Lapierre wrote: »
    Left hand thread?

    I checked the thread direction before starting. With the bike upside down, bb loosens with spanner moving towards back wheel, clockwise drive hand side, counter clockwise other side. Only second time I've done it and in future will have a slightly different technique. For me the awkward part was holding the BB tool in place while applying power, so the trick was to use something that screwed into the crank to hold the bb tool firmly in place. Once the whole thing is bolted together so the BB tool can't fall out, you can apply all the leverage you want. Main concern was breaking the frame.


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    #6
    Brian?
    Moderators, Recreation & Hobbies Moderators Posts: 21,375 Mod ✭✭✭✭Brian?


    Spray some wd40 on it on the inside. Wait 24 hours and it should come off.

    they/them/theirs


    And so on, and so on …. - Slavoj Žižek




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    #7
    JMcL
    Registered Users Posts: 2,219 ✭✭✭JMcL


    Heat might help, even from a hair drier on the BB shell might be enough to make it expand slightly


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    #8
    dvntie
    Registered Users Posts: 777 ✭✭✭dvntie


    When trying to apply power to a system like that it's often handy to put the wheels back on so you can put the bike right side up and swing out of it with a big bar


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    #9
    macnab
    Registered Users Posts: 1,505 ✭✭✭macnab


    Diesel will work beter than WD40 as a penetrating oil, and a kettle of boiling water will work wonders on a seized BB, especially if its aluminium as the diferent rates of expansion will be more pronounced.


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    #10
    smacl
    Moderators, Society & Culture Moderators Posts: 15,754 Mod ✭✭✭✭smacl


    New BB arrived yesterday and I fitted it last night, so all good for the old hack / pub bike once again. Kind of funny how you get attached to a bike once you've done a lot of miles on it, even though its nothing special.


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