Centurion Bottom Bracket help
 

I am removing and replacing the BB on my Centurion Dave Scott Ironman. Removing the crank arms and the right side of the BB was fairly straight forward but now I have hit a wall. The left side uses a 32mm wrench but it seems to be stuck tight. Before I really start wrenching on this thing I want consult with you all and get some ideas on what I should be doing. Is it reverse threaded?

The BB has a name on it but the name has been scratched off. It still has "Made in Japan" on it and says "1.75 x 24". What does this translate to in terms of what size BB I should buy?

Park tool has a good section on how to remove the BB.
http://www.parktool.com/repair/readhowto.asp?id=93

Removing them without the proper tools can be done but you risk damaging things, and creating a really labor intensive repair. If you seriously mess up you could even be buying a new frame. Hopefully you have a friend with the right tools who will lone you them. Other wise if things start to go sour give up and buy the tools early.

Also use lots of liquid wrench. If you can let it soak for several days. Save lots and lots of trouble.

Sorry. I wrote that post while looking at the frame...and it was sitting upside down. I have a thin 32mm wrench that is specifically meant for use with bike repairs, but I don't know if it is mean specfically for the bottom bracket.

Don't forget the drive side cup is left-hand threaded, i.e., clockwise to remove.

+1 on Sheldon's method of removing a fixed cup with a bolt, washers, nut. I took one off last weekend using his method and it was unbelievable how much force I had to apply before it came loose. Was undamaged too!

A large crescent wrench works well for me in removing the fixed cup. For the adjusting cup, I never found an alternative to the proper tools; a spanner wrench and a pin spanner.