The motor is clanking following belt replacement - what's wrong?

I discovered that when the belt had broken it had forced the fan into the side of the fan housing. So I took off the smaller back panel, which just covers the fan and fan housing, which let me see the metal housing ring which was bent and the fan blades were clearly hitting it. I bent it back into shape and replaced the back panel, Bob's your uncle!

K Neal
August 2007