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Discussion Forum
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Icing Carburetor

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Ken Opperman

01-27-2001 18:05:07




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I've a 59 Case 200 and under certain conditions the intake manifold ices up just above the carburetor. Then the tractor starts chocking out and I need to use the choke to keep it running. Any ideas on a cure?




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C. Amick

02-06-2001 09:47:47




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 Re: Icing Carburetor in reply to Ken Opperman, 01-27-2001 18:05:07  
OK, here's what I think is the cause of the icing problem and what I did to help the problem on my 300. I think the icing problem is caused by the long intake pipe between the carburetor and manifold. I cut a piece of aluminum flashing and bent it in a "U" shape around the intake pipe and upper part of the carburetor. The open side is toward the engine block. I wrapped a wire around the pipe and brought it out through two small holes in the flashing to hold it in place. It seems to minimize the icing problem. It also helps it thaw out faster by collecting heat from the engine block.

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g burns

01-28-2001 11:32:10




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 Re: Icing Carburetor in reply to Ken Opperman, 01-27-2001 18:05:07  
My 311 with the same carb ices up all the time, everytime, even up to about when its 45 degrees outside. Doesn't have anything to do with choking problem, although mine is a little on the rich side.



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Brent

01-27-2001 20:10:57




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 Re: Icing Carburetor in reply to Ken Opperman, 01-27-2001 18:05:07  
My SC does the same thing, except it doesn't need to be choked when the engine is warm. The manifold above (downstream of) the carburetor frosts up pretty good, though.

There is a venturi that sits between the carb and the manifold. I asked a mechanical engineer at work, and he said that the air/fuel mixture accelerates and expands as it exits the venturi. This expansion is accompanied by a reduction in temperature, which is why there's frost on the manifold.

But that doesn't explain why you need to choke your 200.....

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