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JD 'A' intake manifold icing

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Dave

02-27-2003 16:14:15




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We just got a JD 'A' and got it running ok but the intake manifold tends to ice up. Ice will form around the manifold just where it connects to the carb. Is this normal or do we have problems here????? Thanks for anyones help




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Ray Fenchak

02-28-2003 18:28:01




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 Re: JD 'A' intake manifold icing in reply to Dave, 02-27-2003 16:14:15  
dave< I Have had this problem with my '51 'A' ,After some research i didcovered ther were TWO types of manifold for my gas fueled engine,#A3382R (colder) and # A4092R (hotter) the latter was supposed to prevent this problem in cold climates. mine has the A4092R and still does ice up some but after reading the other posts i think i will try the drygas.. my manifold was broken and I had a terrible time finding a new one(finally at mother deere.. had to give my left arm and half of my hair for it) maybe it will work better if youcan find one of the A4092R's

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RayP(MI)

02-27-2003 18:08:14




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 Re: JD 'A' intake manifold icing in reply to Dave, 02-27-2003 16:14:15  
Not an uncommon problem. It can build up enough ice in the interior of the carburetor to choke off the air supply enough to stall the tractor. Had the same problem with our '47 B. Dealer partially solved the problem by putting a hotter manifold on. Sorry, I was too young to remember the deatails at the time. You might try to build some sort of a shield or duct over the intake to shunt warm air off the exhaust manifold over the carb.

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old bones

02-27-2003 18:02:38




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 Re: JD 'A' intake manifold icing in reply to Dave, 02-27-2003 16:14:15  
i have a 49 A and it used to ice up quite a bit (until the engine warmed up) when it was cold out, especially when cold and damp, even with a full heathouser. i started putting in a can of isopropal alcohol when i filled the tank in winter- end of problem.



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Clooney

02-27-2003 16:39:23




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 Re: JD 'A' intake manifold icing in reply to Dave, 02-27-2003 16:14:15  
Dave, it's normal & can be annoying. As long as it doesn't effect the way the engine runs it won't be a problem. If it ices up bad enough it will also ice up inside the carb & then you will have runability problems..



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2 cylinder

02-27-2003 16:38:59




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 Re: JD 'A' intake manifold icing in reply to Dave, 02-27-2003 16:14:15  
I have a 47 JD-A that will frost up the manifold even during the summer months. As far as I know this is not uncommon/common, but it does happen. I have not had any performance problem with mine as a result of this. Just my humble observation.



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Dave K

02-27-2003 16:38:53




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 Re: JD 'A' intake manifold icing in reply to Dave, 02-27-2003 16:14:15  
If you are in cold weather or cold and humid weather it will do this some. Should clear as soon as the engine warms up. The older A's do not run very warm in cold weather and, on mine, I usually have to keep the shutters closed in cold weather to get the engine hot. If you are missing the shutters, some cardboard on the front of the radiator (not over the grill only) will help warm it up. The reason the ice forms there is because that is the narrowest part of the carb, the venturi, and the air is compressed some there and increased in speed and, as it passes through expands and cools below atmospheric temperature, thus freezing the moisture in the air. That is why reciprocating aircraft engines are equiped with carberator heat controls. On some very old cars, before heat manifold valves were commonly used, the carbs would ice up to. Old tractors also.

Dave

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David

02-27-2003 17:17:44




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 Re: Re: JD 'A' intake manifold icing in reply to Dave K, 02-27-2003 16:38:53  
Thanks so much for the information fellas
We thought we had some problems here.
I enjoy this discussion board, Like going to school again but is alot more fun



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Terry H

02-28-2003 13:43:31




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 Re: Re: Re: JD 'A' intake manifold icing in reply to David, 02-27-2003 17:17:44  
My '50 A will frost up in 90 degree weather, untill the engine warms up good. If you set a can of your favorite beverage up there for a while, it'll cool it right down! I thought that was another JD innovation to make farming easier!

Good luck,

Terry H



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dave

02-27-2003 20:32:37




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 Re: Re: Re: JD 'A' intake manifold icing in reply to David, 02-27-2003 17:17:44  
I have a A with the same problem, has never been major problem, just add a can of heat or simalar product as another person so stated. A word to the wise--remember to open the bottom drain in the carb in freezing weather after shut downs and shutting off the gas. You know all about the putt putts poping off the bottom half of the carburator-- We used to leave the the old A in the woods for the buzz saw etc.in the winter. At one time I was totaly convinced some hunter had shot the carburator or hit it with a stick. I kind of know better now what caused it.

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