Removing stuck alu BB cup from alu frame

it's doable, thank god

when you encounter an alu bb cup with a f#cked up outside ring, stuck inside the bb shell of an alu* frame - like this deceased (brutally murdered, actually) dura ace unit, you could try the following:

• get a sharp metal pin that you can put a decent size hammer to
  
• knock out the bearing shell from the outside > inside of bb shell
  
• break out a fine hacksaw
  
• cut the bb shell; make sure to stay clear of the threads
  
• cut again, at 1/3" from the 1st cut
  
• use a screwdriver from the other side of bb shell to lever the middle part out (put something round, made of steel covered by at least 2 layers of cloth between lever and cup on inside of bb shell, so as not to damage threads)
  
• if necessary, cut once more, opposite the former 2 cuts
  
• knock on the outside edge of the cup ring towards centre of bb shell, from right next to both the 1st 2 cuts
  
• it will come out by scewing it loose if you haven't deformed it so much that it has dropped out already
  
• hey presto!
  
  

good luck!

sincerely, your amateur technician/butcher peter v

• steel frame/alu bb cups: torch it :)
  

SAdly it doesn't work with Campy Veloce/Mirage or Shimano UN or cheap BB's where you can't really pull out the axle...! :(

Nice job tho ;)

Thread revival!

I am going to give this a go as Im part way there having cut a slow in already, just need to follow up after seeing this and gaining a sliver of hope.

Sidenote anyway, I have a Campag Veloce BB and you can remove the BB internals including axle/spindle etc by taking one side off (Ive only tried with non-drive side removed) and giving the axle on the other side a hard whack with a hammer. It was only a push fit into the remaining cup, although very tight so it took a number of sharp hits to free it up.

PS if you try that and bend your frame or something don't blame me, just passing on what happened!

Just to add my two-penny-worth. Might help someone in the future:
Shimano UN54 BB in an Alloy frame -
been on for several years & when it got crunchy I couldn't get the fucker off.
Tried plenty of Plusgas & eventually bent my wife's extending wheel brace. So bought a 27" long breaker bar to add leverage but it still wouldn't shift. By now the thought of ruining the paintwork using a blowtorch seemed like the only option, then I read online someone using hot water ...
One kettle of water later & a lot of 27" long breaker bar leverage & the fucker moved!!!!! Can't put in words the joy this gave me!

I've still got my BB stuck into the marin frame.....suppose the boiling water expanded the frame and gave the BB shell a bit of breathing space?
I don't care about the paintwork, might just get a blow torch out, and I could really do with a hack bike too