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Tractor Talk Discussion Forum

Farmall F 20 mystery problem

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jmark

11-22-2007 19:38:36




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I have a Farmall F 20. Three weeks ago I parked it under a shed and yesterday went to start it back up. It was running like a top when it was put up, and now it sounds like it"s missing on a cylinder. I checked the timing, retimed it, and cleaned all the spark plugs. I"m stuck. Any ideas??
thanks.




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jmark

11-23-2007 20:34:05




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 Re: Farmall F 20 mystery problem in reply to jmark, 11-22-2007 19:38:36  
Thanks to all. Just some info: I changed each plug, each wire, and then the entire magneto cap looking for the problem. There is spark to all cylinders, but cylinders 3 and 4 are not firing. I was talking to my stepfather, and he also mentioned the valves sticking. I"ll try that tomorrow. Fortunately, I have a backup F 20 (my fun workhorse) to go for rides and think. Thanks to all your help.

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flying belgian

11-23-2007 06:14:26




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 Re: Farmall F 20 mystery problem in reply to jmark, 11-22-2007 19:38:36  
Sticking valve. F-20 was natorius for that. simple fix. pull valve cover off. spray penitrating oil on all valves. start tractor and insert screwdriver between rocker and valve while running. That will free it up.



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Coloken

11-23-2007 00:10:30




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 Re: Farmall F 20 mystery problem in reply to jmark, 11-22-2007 19:38:36  
Just a wild guess, but could be a valve sticking. While it is running slow idle, dribble some kind of penatrating oil in to the intake.



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in-too-deep

11-22-2007 20:13:51




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 Re: Farmall F 20 mystery problem in reply to jmark, 11-22-2007 19:38:36  
As it's running, pull the spark plug wires one by one and replace them one by one. The engine will change when you pull a wire that's working(meaning you're getting spark and cutting the spark disables cylinder). When you pull a wire and the engine DOESN'T(meaning you weren't getting spark anyway) change, that's the cylinder you need to scrutinize. That's the first thing I do when an engine is running poorly; isolate the problem. If NOTHING changes when you pull ANY of the plug wires, it could be in the valve train (valve stuck open) or in the carburetor (gummed up with old gas) Good luck and report back with any results or more questions.

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