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Tractor Talk Discussion Forum

SMTA Carb Icing

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Burnett

10-15-2005 18:13:21




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Carb is super cold at all times. Upgraded engine to 4 1/8" pistons. How do I fix? Someone told me to change the venturi to a no 33 from the 27 currently in it. Runs "rich" but is starving for fuel.




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Jim J

10-16-2005 07:28:09




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 Re: SMTA Carb Icing in reply to Burnett, 10-15-2005 18:13:21  
I had a 400 that iced the carburetor. The camgear was loose on the camshaft. I put a new camshaft and gear in and fixed it.



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jfp

10-16-2005 04:30:35




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 Re: SMTA Carb Icing in reply to Burnett, 10-15-2005 18:13:21  
My M used to do that right after I rebuilt the carb, not the engine. I just kept on making adjustments until it quit icing. Its just to rich.



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old

10-15-2005 19:11:13




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 Re: SMTA Carb Icing in reply to Burnett, 10-15-2005 18:13:21  
Its just a fact of life and how a carb works. Only thing that might help is to figure out a heat sink that will help warm the carb when running. When gas gets atomized it also gets cold and then a crab will ice, only way I know to fix is to let the engine warm up real good before working it



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toolman

10-15-2005 23:59:52




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 Re: SMTA Carb Icing in reply to old, 10-15-2005 19:11:13  
or wrap a piece of fiberglass pink around it.



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KevinM3

10-16-2005 01:07:11




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 Re: SMTA Carb Icing in reply to toolman, 10-15-2005 23:59:52  
Carb icing is a common reality in cars and no doubt in tractors with normally aspirated carburettor engines operating in cool/cold and damp atmospheric conditions. Cars and indeed aircraft have a hot air stove, ducting hot air from around the exhaust manifold into the intake system and thereby raising the intake air temperature, melting the ice build-up in the carb. The rich mixture is a normal result of carburettor icing and will eventually stop the motor completely. On a few occasions I had been called to a car which had stopped on the road for no apparent reason, but when I got to the job, the motor started and ran normally, due to the fact that the warmth of the engine warmed the carburettor and melted the ice which had originally stopped the motor. You will probably find that when weather conditions change, the carb ice problem will disappear too.

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UncleTom

10-16-2005 05:17:36




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 Re: SMTA Carb Icing in reply to KevinM3, 10-16-2005 01:07:11  
I had a vw air cooled engine running on the shop floor a few years ago. 42 degree air will frost up the carb so bad that the fuel doesnt atomize properly and seems if it is running rich becuase it is getting drops of fuel rather that mist.It wil foul plugs and choke it outif left running like that. Get heat to the carb and the frost will melt and start running right again.The air is like a wind chill rushing through the carb.My .02

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Hoosier JD

10-16-2005 06:05:20




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 Re: SMTA Carb Icing in reply to UncleTom, 10-16-2005 05:17:36  
I had an old car while in college that would do that. I put myself through college and had to have that car to get me back and forth to work. I just added a bottle of "Heat" every other tankful of gas, worked fine. I ended up putting 165,ooo miles on it before I was out of school. Good luck, Mike



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