Matheus22

Something "interesting" just happened to my bike and I haven´t found a decent explanation for it neither a good sugestion of what to do to fix it at the bike shops around.

I was using this campy BB, italian thread, 111mm, with a campy Xenon crank. They´re working just fine during the last 3 months, but all of the sudden I realized the BB rigth cup was coming out of the frame, and the crank was touching the BB cup. I thougth the frame thread was history, but for my surprise everything look ok when I removed the BB.
After that, I tried to put the pieces together, only to discover that even when the BB was "in the right place" my crank was STILL touching the BB cup.

The impression that I´ve got was that the spindle moved to the left, leaving the right side shorter (I´ll check that hypothesis later this week). I don´t believe that the crank could have pressioned the spindle so hard that it yielded.

Any suggestions of what I should do (specifically, what BB spindle lenght should I look after) to fix this?
The pictures below were taken before the problem, I´m posting them just so you can see the parts I´m talking about.

HillRider

Italian threaded bb's are notorious for having the right (drive side) cup unthread in use unless they are installed VERY tight. If your bb did this, the resulting play and rocking may have damaged the cartridge bearings and allowed the spindle to shift out of line.

I expect you will have to replace the bb. This time really torque it down to spec and consider blue Loctite to keep it in place.

Matheus22

So I should stick with the 111mm spindle anyway? After I use the loctite stuff will I be able to unthread the BB if I need it? I don´t know much about this stuff, so I get a bit insecure (wich does NOT mean I don´t trust you, people here at BF always helped me)
Thanks a lot for your help!

MudPie

I agree 100%, - installation torque is very important. I don't have experience with Italian threading, but often, the installation torque is more than you'd expect. Also, I am not a big fan of Loctite if installation torque is sufficient to keep the parts in place. It could make future removal a headache.

HillRider

Blue Loctite (Grade 242) is a very effective thread locker but allows disassembly without heat. You will be able service the bottom bracket in the future but it shouldn't unthread by itself if the installation is done properly.

The installation torque spec is VERY high and that plus the Loctite should prevent future problems. Loctite really shouldn't be necessaty but it is a good safety precaution.

Matheus22

Thanks a lot hillrider. I won´t have much trouble finding a Campy 111mm italian thread BB, but anything diferent would be almost impossible for me to find. I would have to import...
I´ll use the Loctite 242 and WATCH the mechanic install it, so I can make sure it´s the right torque. Since I´m not planning having to remove the BB so soon, I´ll use the loctite as a safety precaution like you said.
Two bike shops and lots of calls to bike shops from São Paulo later, I get decent advice from you here in bike forums. You guys are great, thanks again!