Originally Posted by
robertlabrie
.......Playing with the old BB, the left side (not crank) bearing ring is offset from the cartridge, and spinning it around it feels rough and make a bit of a crunching sound. I understand it's hard to judge without holding it, but you think it's more likely that I warped the shaft or ground out the bearing?........
It sounds like a frame problem. BB cartridges have very stiff shafts and relatively thin shells. If the BB shell in the frame is not square thru and the axes of both threaded sections not concentric, the shell of the cartridge will be distorted, destroying the bearings in short order.
Suggestions:
First take the bike to a well equipped shop, and have them face the BB and chase the threads. See:
https://www.parktool.com/blog/repair...ing-and-facing
The person doing this should be able to tell you if they are able to repair the situation or not.
If they are successful, use grease on the threads when the BB cartridge and make sure that it is properly torqued (BB cartridges are supposed to have relatively high torque, check the specifications for the particular BB you install - use a torque wrench).
If the face & chase is unsuccessful, one option is to take it to a machine shop, and have them make the bore square with the frame, a use a threadless BB, like this one:
https://www.amazon.com/Sunlite-Threa.../dp/B002K2IG66 NOTE: they are available in various sizes.