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1944 JD A Racing Engine

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JKC

03-23-2002 11:10:02




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The engine on my 1944 JD A races-away uncontrolably. It is O.K. while I hold the trottle control on top of the carburator in a certain position, but as soon as I let it go, the engine almost instantaniously "revs-up" to very high RPMs.....all by itself. I am not a mechanic, but believe it has something to do with the governor. If that is true, can someone explain to me how I can go about exploring the governor problem, and what to look for?

Thank you.

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Deere Puller

03-23-2002 14:41:32




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 Re: 1944 JD A Racing Engine in reply to JKC, 03-23-2002 11:10:02  
A good way to check if you have governor action is to remove control rod from carb and move butterfly by hand. You should be able to feel the governor try to pull her down once R's get high enough (1100 or so). If there is no action on the control rod, make certain that the rod connecting the governor spring to the throttle control is not too short. If it is, the spring will be stretched out beyond the governor's ability to counteract internally. If that checks out OK, you probably either have a fly bearing race that moved off the brass control sleeve inside the governor or a control fork that detached from the operating arm. (Of course, there may be other problems, but these are two of the most common) Good Luck

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Will P

03-23-2002 12:36:17




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 Re: 1944 JD A Racing Engine in reply to JKC, 03-23-2002 11:10:02  
Try lengthening the rod from the govenor to the carb. If the govenor is tying to slow down the engine, and the rod too short it will keep the butterfly too far open. Can you close the butterfly with the throttle? Try messing with the rod first.

Will P



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