Good day everyone, my first post on the site. Here we go! The camp that I am maintenance director at purchased a '58 WD45 this spring. I have used this tractor for many duties and it has been great! the other day, however, I went to start it and pull the starter rod and it crank over as normal. It didn't start in the first few seconds, so i let off the starter and was going to apply the choke and try again. I pull the starter rod and this time it was just a click and not much of one. I tried again. The same. I am pretty handy with mechanical being trained in the automotive field and being a paid mechanic for over 25 years. I made numerous checks, pulled plugs, tried turning engine over with crank(nothing) then tried pulling it to see if it would break. Nothing, it just dragged the tires on the road. The engine appears to be locked tight and I have no idea why. It ran great the day before and was even free when I first tried to start it. Any Ideas out there? I am dumbfounded at this point. Thankyou.