Just kinda as weird story I thought I would share. Little back story ,bare with me 1942 Merc flathead in my 39 Ford Picup. Last year while driving with my wife (never happens) on the hi-way the center bolt that holds my generator snapped .Fan and genset fell into radiator ......loud noise ,bing bang boom , made it off the hiway ......Open the hood and Im like ok ,, get the wife to pry up the gen .Ill tighten the bolts ,oh shit ,the bolt is sitting on the backside of the fan hub ,,, never saw anything like it . Towed home, ,switched out the intake manifold.back on the road .....8 months later Today ...smelled a little antifreeze after a trip up town . Open the hood ,mmmmm , fan belt is a little loose,gen belt is fine . I Drive to my brothers house because I need two hands .loosend the two 5/8 fan bolts ,then the Big 7/8 generator bolt . Tighten fan ,,, tighten generator ,,,SNAP , ,AGAIN , I did not over tighten ! IM thinking WTF. I ordered another bolt going to fix /drill an tap the original intake and do the swich back. Im thinking 2 things , cheap crappy bolt .(they look original)...or my pullies are a smidge out of line ,causing undo pressure / fatigue. They look good to the eye .Two bolts in less than a year ????