HEre is something :
8. Now comes the term of the whole fan assembly. You see it supports itself with two brackets. One heavy duty like cast iron on the left and one thinner on the right side. You ( probably, I couldn’t in the way I did it anyway) see it has three large screws that you have to loose. The other bracket has only one that is the same one holding the alternator in place, loosen it remove the bracket and put the screw again in place.
This comes from a complete set of instructions for installation of an electric fan you can read
HERE