Crankset doesn't stay on bottom bracket!
I have a 1997 Norco Scrambler, as far as bikepedia shows. The original crank is a TX70, I ordered a FC-M191 48/38/28t 170mm crankset to install.
Techdocs states that my bike uses a bb-un26 bottom bracket, and so would the fc-m191. Some how the left pedal doesnt slide all the way onto the bottom bracket. It seems that the bottom bracket starts smaller than the opening on the left pedal, then is too big for the pedal to slide all the way in and sit comfortably on it. This has resulted in the bolt coming loose on my recent bike trips and the loose crank arm warping the inside of the bottom bracket attachement hole slightly.
Is there something about the bb-un26 I dont know? If I go buy a new one, will I have the same problem? Are there other BB's I can rely on to work better?
If I need a bottom bracket tool, can someone point me to the proper park tool for this? Is it BBT-22?
I believe it calls for a BB that is 122.5 mm. Thanks for your help!