I've got a Ti Kona Hei Hei hardtail with a totally seized BB in it. I've just bent my vice trying to get it out and am struggling to say the least.
Any tips good people?
Bike Forum
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Seized BB in a Ti frame
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Posted 1 year ago #
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I removed a bb cup many years ago by dissolving it in hydrocloric acid. Cleaned the BB area of the frame up a treat, too.
I would recommend proceding with caution however.
Posted 1 year ago # -
You are turning it in the right direction?
(I have been known to have a brain seizure and try the wrong way - especially when I have the bike upside down - embarassing
)
Posted 1 year ago # -
Yep - def turning the right way. Was hoping to sell the frame, but it doesn't look like that's going to happen at the mo. Thought it would be a quick strip down, clean and polish.
I was so wrong.
Posted 1 year ago # -
size of frame is it? may be interested, tried pouring coke into frame to leave sloshing around the bb works a treat fro seatposts
Posted 1 year ago # -
Cool. I'll give the coke a try. 19" btw.
Posted 1 year ago # -
If its a HT2 bb, could you try and get the bearings out of it and then just carefully saw through the aluminium cup?
If its sq taper or octalink, then that wont work.
Good luck with that though!Posted 1 year ago # -
Square taper unfortunately.
Posted 1 year ago # -
Heat?
Posted 1 year ago # -
Steel cup in Ti frame?
heat
penetrating oil (graphite or plus gas)
over
and
over
again...
Time and persistance is the most important thing. I used to do the seized stuff for a bike recycling coop in oxford. dont rush it
last resort cut the cups until you are nearly through and then use a screwdriver and hammer to break the shell inwards.
I had a bath of penetrating oil made from a cut up yogart pot so the frame could be left to soak for days...
oh and on occasion Ive used plumbers freeze which can be great tho more useful on ali frames
good luck
Posted 1 year ago # -
I use a BB removal tool that can also be screwed into threads of a square taper BB to give you a firm attachment then for really tight ones I slide a 6 foot marquee pole over the handle for a bit of extra leverage - not failed yet.
If you can't get it done I'd like the frame too
Posted 1 year ago # -
Pedros do a great tool for screwing into a BB:
http://www.chainreactioncycles.com/Models.aspx?PartnerID=79&ModelID=14426
Cyclo do an all in one job and a kit, Id go with the pedros one though.
an old style seat qr (1/4 inch i think) will fit the axle thread too
really important tools for the BB removal armory Posted 1 year ago # -
Thanks all. The tool itself is not slipping out. I have completely bent my vice with the tool in it. It is soaking at the moment. I guess I'll just persevere.
Posted 1 year ago # -
I have completely bent my vice
Do you work out?
Posted 1 year ago # -
Thanks all. The tool itself is not slipping out. I have completely bent my vice with the tool in it. It is soaking at the moment. I guess I'll just persevere.
Posted 1 year ago # -
Success! 4ft scaffold pole did it. Turns out it wasn't the cups that were stuck in the frame, but the bb unit itself welded to both cups. Thanks for all the tips guys. Time for a brew.
Posted 1 year ago # -
Attacking titanium with acid can cause hydrogen embrittlement in titanium. Although a mixture of nitric acid and hydrofluoric acid can be used to chemical machine titanium, but will still attack the titanium.
Heating titanium in air will cause the titanium to discolour (badly) since titanium readily absorbes oxygen and nitrogen.
http://www.keytometals.com/Article42.htmEither use liquid nitrogen forced through the centre of the BB axle to freeze / shrink the BB and remove, or Loctite freezeandrelease, Wurth Rost Off, Ambersil Rust Flash, http://www.youtube.com/watch?v=b0BaowQvL6c etc
Posted 1 year ago # -
Quite glad I didn't have to go through all that! Good to know for future though.
Posted 1 year ago #
Topic Closed
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