There was no pressure on it. The hole wasn't threaded. It is smaller than a pencil. We loaded a small threaded bolt with JB weld and tapped it in, after putting some JB weld in the hole first. I'll let it sit over night and fire it up tomorrow.
I think we found the problem that caused it all. The fan belt had not been replaced. The tractor is 5 and 1/2 years and it had been adjusted all the way out, couldn't get any tighter. You could turn the fan with your finger with little resistance. The belt showed signs of slipping on its sides. Needless to say there is a new belt on it tonight. I hope to take better care of the tractor now that I am retired and not working 10 to 12 hours per day. Thanks to everyone for helping me out, I'm sure I will need you again. Now I can go mow the field and spray some peaches.