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Farmall & IHC Tractors Discussion Forum
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Farmall M carburetor question

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FMS-KS

02-14-2006 19:40:38




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We have a 1941 Farmall M that was originally a dual fuel model.

Three or four years ago we had to replace the manifold. We replaced it with a gas manifold and since that time we have experienced icing at the top of the carbuetor when the temperature is about freezing and we have high humidity.

We are having some problems with the carburetor at this time and wonder if we should go with a rebuilt carburetor that should go with a gas manifold.

Our current carburetor has 1 7/16ths inch opening at the throttle and the manifold has a 1 11/16th inch opening where the carburetor attaches.

This is probably the reason we are experiencing icing at that point.

Would you experienced Farmall individuals agree that I should attempt to replace the carburetor with one for a gas model?

Currently the carburetor we have is a 47387 DA.

Would any of you know what the number should be for a gas model?

Thanks

FMS-KS

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captaink

02-15-2006 06:51:27




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 Re: Farmall M carburetor question in reply to FMS-KS, 02-14-2006 19:40:38  
The icing is caused by the effect of the air passing through the venturi (the smallest diameter air flow area) where the fuel is added to the air in the carburetor. As the air passes through the venturi, it speeds up and the evaporating fuel causes the temperature of the air to drop. This causes condensation to begin to form from just before the throttle plate to where ever the manifold is warm enough to evaporate the condensation away. In freezing or near freezing temperatures this condensation turns to ice or the freezing condition that you note. There is nothing you can do to eliminate it.

A different manifold may help, a comfort cover or heat houser will help, or if you can think of another way to preheat the air as it comes in.

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chadd

02-15-2006 04:56:19




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 Re: Farmall M carburetor question in reply to FMS-KS, 02-14-2006 19:40:38  
Both our M and W6 have a little frozen condensation build up on the outside of the carb. I pretty much figure that it is normal. Swapping carbs won't make any difference at all, because they are the same except that one has a drain cock and the other doesn't. Why did the other manifold need to be replaced? If it had a crack in it or something, could it have been blowing hot air on the carb, keeping it from icing? According to the guys I have talked to, Farmall M's and such never had running problems in winter due to carb freezing(supposedly it was prevented because the governor housing blocked most of the fan air from hitting the carb). When the carbs switched to the other side of the engine (460's, 560's, 660's) trouble started, and dealers fixed it by running a tube from the exhaust to an inch from the carb, so the hot air would heat the carb body. I am not sure if the reasoning is right, but the fix worked on our 460 utility.

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RustyFarmall

02-14-2006 22:08:06




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 Re: Farmall M carburetor question in reply to FMS-KS, 02-14-2006 19:40:38  
If you really have your heart set on buying a "gas only" carburetor, I would be more than happy to sell you one, but I will also tell you that it won't make one speck of difference. The gas carbs and distillate carburetors are identical except for possibly the main metering tube inside, and yours most likely has already been rebuilt with the gasoline metering tube installed.



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Bill Geer

02-14-2006 21:05:32




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 Re: Farmall M carburetor question in reply to FMS-KS, 02-14-2006 19:40:38  
I seen some place where a guy made a thing around the muffler. To preheat the air. pipe in to top of air cleaner. I think that would help/

Bill



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FMS-KS

02-14-2006 21:25:06




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 Re: Farmall M carburetor question in reply to Bill Geer, 02-14-2006 21:05:32  
Bill I fabricated a device to gather some of the muffler heat to preheat the air intake. That seemed to help but I thought that the fact that the carburetor had a smaller diameter than the manifold that this caused the air to expand and produce cooling when the vapor leaves the carburetor and enters the manifold.

I was just trying to see if anyone has any idea in regard to the size of the carburetor openings on the two carburetors-- duel fuel vs. gas.

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old

02-14-2006 20:40:40




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 Re: Farmall M carburetor question in reply to FMS-KS, 02-14-2006 19:40:38  
Carb iceing is a normal part of life and it doesn't matter much which manifold you have, but the duel fuel type did have a set up on some of them to heat the intake some for best atomizeing of the distalite type fuel. You can make side curtains or some other thing to help hold heat in that area to slow down that problem.



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jossette

02-14-2006 19:56:59




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 Re: Farmall M carburetor question in reply to FMS-KS, 02-14-2006 19:40:38  
my old 400 has ice on it all the time, warm or cold. best way to thaw is with a heat houser in the winter time.



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Dave Grindle

02-14-2006 19:50:08




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 Re: Farmall M carburetor question in reply to FMS-KS, 02-14-2006 19:40:38  
my geuss would be the manifold is causing the (normal) carburator iceing ..... at least any H or M i've ever had "ices" the carb at cold temps ( i've never had one with the duel fuel manifold)



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