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Power trouble in a 1951 JD A

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John

09-07-2001 11:15:52




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My cousin has a 1951 john deere A. he has a set of .045 over aluminum pistons on it. IT has a big cam and it runs 35hp when it shiuld be running about 43hp. The John Deere a"A's" had about 38hp. from the factory with cast pistons. They have had about seven differnt carbs on it. They have had valve jobs and everything done on it. The bore was fresh and then they put it together and it sat for about four years. If there is anything that there could be wrong, please mention it.

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gary

09-08-2001 08:02:46




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 Re: power trouble in a 1951 JD A in reply to John, 09-07-2001 11:15:52  
There was a post not to long ago about a guy who installed aluminum pistons and when it got hot and he shut it down it wouldn't turn over until stone cold.You might check R.P.M.s running cold and load it and recheck.



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Mike Aylward

09-07-2001 14:19:56




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 Re: power trouble in a 1951 JD A in reply to John, 09-07-2001 11:15:52  
John, if you know FOR SURE that the timing is right, and that it is getting fuel, air, and spark, then I would look at the governor linkage to be sure it is adjusted right and that it is not binding. To adjust, with the engine shut off open the carburetor throttle disk and also open the throttle to wide open. Disconnect the governor to carburetor rod and see how far it comes from fully reaching the carburetor. According to Deere it is supposed to be "one-half hole short". I always set them about 3/4ths to one full hole short because they are snappier but still don't surge. Once this adjustment is made, leave it alone. If you need to adjust the engine speeds, adjust the back rod or throttle stop, but don't touch this rod. Hope this helps. Mike

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Chuck

09-07-2001 11:35:16




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 Re: power trouble in a 1951 JD A in reply to John, 09-07-2001 11:15:52  
somethings come to mind on the tractor. You advised that they had aluminum pistons and I recall a similar situation. Some years ago, had a block bored and bought new pistons. The engine ran extremely quite but lacked power. I suppose when the machine shop bored they used clearance designed for cast iron. The aluminum expanded more rapidly and actually weakened the power. I've had better luck out of worn blocks 6/7 thousands more clearance. That and timing seems like possibly only areas of thought. If you can gauage your clearance you might be amazed. The later alloy pistons gave more clearances.

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John

09-07-2001 11:41:08




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 Re: Re: power trouble in a 1951 JD A in reply to Chuck, 09-07-2001 11:35:16  
I dont know about the clearence of the pistons, but the timing is right on. THanks for the ideas and I will mention it to my cousin.



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