Just finished restoring my first JD. Its a 1945. Runs Great. Starts on 2d or 3rd pull of the flywheel. When the project began the clutch was locked up. While in the paint shop the painter had his friend come over and unlock it and install new plates/operating bolts and a dog. This assembly has a very large nut and cotter pin on the end of crankshaft. I tightened the nut and proceeded to adjust clutch. Problem 1 the adjusting nuts do not appear to adjust enough to put a cotter pin in at the end of procedure. Never the less I made the adjustment having the right feel on the engaged and disengaged side. Drove it for about an hour and lost the entire adjustment and couldn't disengage. I have gone through this at least 5 times. Same result. Seems right at first but then a no/go after driving it. Some time when it cools the adjustment might be a little better that it was when I turned the engined off. Any ideas on this problem. Could end play in the crank be a problem.