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stuck Chorus BB cup: removal?(4 posts)

stuck Chorus BB cup: removal?Patrick Simmons
Apr 15, 2002 11:56 AM
I've got an old Giant Cadex frame sat in my garage, waiting for me to rebuild it.

It has/had a Chorus (102mm) BB in it, which I need to remove. So, I fit the spline tool, and remove the left cup, no bother.

Before trying to remove the right side I check the Campy docs to make sure I undo it the correct way (clockwise for English thread). Put the spline tool in, turn the ratchet, and all the spline teeth on the cup rip out.

The cup looks to have corroded itself to the BB shell.

Anyone got any suggestions as to how to free it off, bearing in mind heat's a bit of a no-no, since the frame tubes are carbon? I'd like to keep the paint attached as well if possible.

So far I've tried spraying loads of penetrating fluid around the cup. It finally looks as though it's starting to sink in around the cup rather than pouring out the gaping hole. But, the cup still won't move.

Am I going to have to try cutting it out or what?

Thanks for any suggestions.

Had the same thing happengrandemamou
Apr 15, 2002 5:55 PM
Tried heat, penetrating oil and BFH. Nothing worked. I had a friend who works in a metal shop cut it out with a pencil grinder. Luckily there was enough thread to get a new BB on.
re: stuck Chorus BB cup: removal?curlybike
Apr 15, 2002 8:00 PM
Since you got the left out, pound on the bb spindle with a soft hammer and drive it out of the cup. You may need to remove the cable guide retaining screw out of the bottom of the bb shell. With the cup being the only thing left in the frame you can try putting a bolt with washers through the cup hole. Put lock washer and nut on inside of the cup. Try a big wrench on this new tool. You might try flooding the joint line of the cup and frame on the inside of the BB with liquid wrench and tapping it with a hammer several times. If all this does not work, try slitting the cup with a dremel twice diametrically opposed. When you start to see the crest of the frame threads drive the halves toward each other, this should loosen the cup in the frame. Good luck and let us know.
Hacksaw bladeKerry
Apr 16, 2002 5:09 PM
If you don't have a Dremel tool, you can accomplish the same thing with a hacksaw blade, sawing through the cup in a couple of places, and taking great care not to cut into the BB threads.