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Tractor Talk Discussion Forum

Carburetor Icing

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William Thompso

01-23-2007 11:52:27




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I have a Farmall 706 291 gas tractor. This is my second winter with this tractor,and completely to my surprise the carburetor ices up on the outside of the top half where all the jets and gas intake are. It did not do this last winter, but I did rebuild the carb. last summer. I can run it, but I have to keep the choke completely closed to keep it running.

Did I do something wrong in the rebuild or is it the heat riser not working? I"d appreciate any feedback from you IH/Farmall gurus. Thanks in advance for any info.

Bill T

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gene bender

01-25-2007 07:31:27




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 Re: Carburetor Icing in reply to William Thompson, 01-23-2007 11:52:27  
that was a perfect normal operation as all carbs can dothis depending on temp and moisture in the air. carbs have been doing that since they were built my B did it the other day pushing snow even can do it in the summertime.



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Nolan

01-24-2007 03:17:56




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 Re: Carburetor Icing in reply to William Thompson, 01-23-2007 11:52:27  
Any time you've got a venturi, you lower temperatures. And if conditions are right, ice builds up.

Some carburetors are more prone to it than others. Now that I can't really explain, but I've learned to accept it.

To keep ice from forming on parts in the venturi, you need warm air, or a warm carburetor. Cars routinely have a warm air duct that draws around the exhaust manifold. Some also used a manifold/carburetor heater system of hot water or exhaust. It works.

Before I went modifying a tractor, I'd wait a little longer to see if it's a real problem, or a fluke occurrence.

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Mark In Monroe

01-24-2007 00:48:23




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 Re: Carburetor Icing in reply to William Thompson, 01-23-2007 11:52:27  
Hey William, If you have to keep the choke closed that means the air/fuel mixture is a little lean. You need to open up the main needle/jet to give it more fuel.Using the choke cuts off air and sucks in more fuel.Sometimes you need to readjust that main needle/jet for summer and winter use, due to the air temperature.



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davpal

01-23-2007 22:34:05




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 Re: Carburetor Icing in reply to William Thompson, 01-23-2007 11:52:27  
It really helps my old 9n to put a piece of cardboard over the front of the radiator and almost totally block it off. That fan up front on the engine is not helping your carb icing at all. I just put a bungee around the sides of the front panels to hold it in place. If it is super cold you can block it right off. If it gets a little warmer slide it down a couple of inches and let some air through. It does wonders to help get them running right on those bitter cold days plowing snow. Defenitely not a new trick and it works great for me.

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Jerry/MT

01-23-2007 22:02:30




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 Re: Carburetor Icing in reply to William Thompson, 01-23-2007 11:52:27  
This is normal and had nothing to do with your rebild of the carb. It can happen at ambient temperatures as high as 50F with high humidity depending on the carb design. Normally the intake manifold get warm and transfers some heat to the carb and the problem resolves it self. It has nothing to do with water in the fuel.



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Reply

01-23-2007 18:34:41




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 Re: Carburetor Icing in reply to William Thompson, 01-23-2007 11:52:27  
Simply dump in a bottle of gas line anti-freeze containing ISYPROPAL(not sure of spelling. Problem will go away almost instantly.



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twomile

01-23-2007 18:28:23




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 Re: Carburetor Icing in reply to William Thompson, 01-23-2007 11:52:27  
We had a Hurcules on an old combine that would ice up every night. I remember that it was an updraft carb, maybe Marvel Swebler. Found out that we had to keep dry gas in the tank. Seemed to work fine then.



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Allan In NE

01-23-2007 14:17:19




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 Re: Carburetor Icing in reply to William Thompson, 01-23-2007 11:52:27  
Bill,

That is totally normal and tells you that you did an excellent job on the overhaul.

Let it warm up a few minutes.

Allan



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old

01-23-2007 12:41:21




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 Re: Carburetor Icing in reply to William Thompson, 01-23-2007 11:52:27  
Would you believe its normal and ALL carbs do it at some point in time. It has to do with the way a carb works and if its humid out it happens. You just need to let it warm up some before you can really work one when that happens, once warmed up it does go away. Some time opening up the main jet a turn or so also help so you can use it sooner

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