I have tried to fit a fan guard to the radiator and then fit it to the tractor but i've come up against a new problem. The fan blade will not fit inside the fan guard!! The fan blade looks like it has been bent and straightened, when i measure it the fan blade measures 15 inches. I looked the parts list which seems to list an additional blade as 15 inches. What size should a standard dexta fan blade be? I know this is an original blade as it is stamped ENFO.
I then measured the fan guard which was interesting as from left to right the guard measures 39cm (15 1/4 in) but from top to bottom it measures 40cm (15 3/4 in)? When i center the blade it will not clear the sides of the guard. It almost seems as if the inside of the guard is at no point a perfect circle preventing the travel of the blade. (Why is everything hard?)

Would anyone know if I need a new guard or is my fan blade too long or is there some other reason? Here are some pics...
http://www.flickr.com/photos/skidancer/
Thanks a lot!