Removing shimano hollow tech II BB

Mdpascoe
Mdpascoe Posts: 22
edited February 2013 in Workshop
Hi all,

I've just purchased a new bottom bracket and chainset for my giant defy.

I'm having a few problems removing the existing bottom bracket, external hollow tech II type,due to how tight it is and I can't get it to budge!

I have the park tool bbt9 tool, has anyone got any suggestions to get the thing off, or have I just got to give it some proper effort?

Thanks in advance!

Comments

  • nicklouse
    nicklouse Posts: 50,673
    You are turning it in the correct direction?

    Pictures on Parktools.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Mdpascoe
    Mdpascoe Posts: 22
    I'm pretty sure I am.

    The cups already have arrows on them so was following them.
  • nicklouse
    nicklouse Posts: 50,673
    the reverse to the arrows to remove them.

    bb04.jpg

    bb02.jpg
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Mdpascoe
    Mdpascoe Posts: 22
    Thanks, ill have another go in a bit!

    Should they come off relatively easily assuming they are being turned the right way(and that I haven't inadvertently righted them lol)
  • mikenetic
    mikenetic Posts: 486
    If they are tightened properly they can need quite a lot of force to budge. I use a Park beam torque wrench to put them in and remove - it has a long lever so you can apply sufficient force in a controlled way.

    Don't force it with a smaller wrench, if you slip all hell will break loose :D
  • smidsy
    smidsy Posts: 5,273
    When you do get it off be sure to put copper slip on the threads of the new one to avoid round 2.
    Yellow is the new Black.
  • Erudin
    Erudin Posts: 136
    Try tapping the BBT-9 with a soft mallet to get it to budge. If that does not work a Superstar HTII tool and socket wrench or 1/2" breaker bar should shift it.

    From:http://www.bikeradar.com/gear/article/workshop-replacing-shimano-truvativ-or-fsa-bottom-brackets-27046/

    "On HT II external cups, ensure the tool is aligned before applying force. A strip of masking tape can be wrapped around the cup to protect the finish from the tool. Use a cheater bar if your tool permits. A judicious blow with a wooden block or mallet can work wonders..."
  • thescouselander
    thescouselander Posts: 549
    Good tip on the mallet above. Also, there should be arrows on the BB so you can easily see which way you need to be turning to undo the BB. The BB on my Defy was on quite tight so I applied a bit of gentle persuasion with my foot.

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