Originally Posted by IAmSam

While I mostly agree with the "you shouldn't even try to work on a sealed bearing bottom bracket" sentiment - especially considering that you can pick up any number of decent replacement versions of sealed 103mm square taper BBs for as little as $12-20...I too, like Timothy H, regard being told not to mess with something as an invitation to do so

Once upon a time I had a same size no-name generic, so-called, sealed bearing BB as yours on one of my bikes and when (too soon to my thinking) it got crunchy - I just I replaced it. But of course I had to look inside the old one, and it was not too hard to pop the "seals" out with a small flat-blade screwdiver. I put seals in quotes because when I got into the thing it was obvious they were not very effective, as whatever lube it may have started with was gone and it was full of rust. It was a loose ball unit but I did not want to pry the ball bearings out so I simply filled it with Naval Jelly and flushed it, a few times 'til the rust was gone. I did my best to inspect for bad bearings and not finding any easily noticeable problems with any of them, simply loaded it up with marine grease and did my best to squeeze the so-called seals back in without damaging them. Using my primitive test method of spinning the spindle back and forth by hand - it seemed quite smooth and functional so I stored it away "just in case".

FWIW - when I later sold a crankset that took that size BB to one of my riding-buddies...I threw in that "rebuilt" sealed bottom bracket, and to this day, a couple years later, have not heard any complaint from him about it...