In the US ceiling fans are required to be supported by boxes listed for that
purpose. Since your box is cracked I'm assuming it is not a fan support box.
What I'd recommend is buying a retrofit fan box. These can be installed and
expanded inside the existing four inch hole you have now. The biggest
problem will be trying to remove the bracket of your existing box. These
boxes are available at electrical supplies and I believe HD sell one made by
Westinghouse
"Joe B." wrote in message
news:RNjAe.13819$O56.2698@trnddc07...
I am replacing a cieling fan and I found that the electrical outlet box is
cracked and one of the screw holes is bored out too much. I'm thinking
that I can fix this by removing the outlet box and screwing a new one in to
the same base that it is screwed into now. Is there anything else I'll
need to do to make the new outlet box safe and useable? Thanks.

Joe