Hi...I am currently working on a 50 Farmall C that belongs to my Uncle. The other day it ran fine but all of a sudden developed a terrible miss. A few ours later we started it and it put out a few large puffs of heavy black smoke before it started. It would run, but very poorly. All the plugs were carboned up with the exception of #2, which appears to have burned clean. I did a compression test on it and cylinders 1,2 and 3 read between 80 and 100 lbs. When I tested #4, it read 0. I checked it several times with no luck. I removed the head and removed both the intake and exhaust valves from #4 and neither of them appeared to be burnt. I also checked the cylinder wall to see if was scored from a broken ring but everything looked OK. I brought piston #4 up to TDC and it seemed to have a little side to side play, but then so did the rest of the cylinders. I was wondering if something could have happened with the cam that would have caused the valves to stick open. Any help or thoughts would be greatly appreciated! Thanks...
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