Carb freezing while D17 is running?
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=104212
Printed Date: 10 Sep 2025 at 4:48pm
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Topic: Carb freezing while D17 is running?
Posted By: D17SeriesIV
Subject: Carb freezing while D17 is running?
Date Posted: 02 Apr 2015 at 8:40pm
So the other day, I used my D17, series II to pull my drag harrow across the garden a few times. When I parked it, there was a thick later of frost on the top of the carb and the bottom of the intake manifold, while it was still running. Any ideas on this? I know I need to rebuild the carb this winter, but this honestly has me stumped. I have replaced the float, and that is all I've done to the carb. Temps at the time were in the 40's. The Venturi did seem loose when I had the carb apart, still don't know if that is normal, I would assume not.
As always, any help is greatly appreciated. Thanks in advance!
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Replies:
Posted By: DougS
Date Posted: 02 Apr 2015 at 9:13pm
Posted By: Dakota Dave
Date Posted: 02 Apr 2015 at 10:46pm
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Carburetor icing normaly occurs in temps between 40 and 80 degrees and the temp dew point spread is 5 deg or less. Air rushing thru the Venturi lowers the pressure and cools the air. That is why carbed airplanes have a carb heat knob. The worst conditions are flying in the clouds at about 60 deg. I've had the engine go from running great to no power output in a couple seconds.
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Posted By: Gerald J.
Date Posted: 03 Apr 2015 at 5:28am
Carbs get cold. There's nothing wrong with the carburetor, you just need some carburetor heat. That's sometimes why there's metal to metal contact between intake and exhaust manifolds. Carb heat tends to be supplied by exhaust manifold heat, sometimes guided by tin work. Or by arranging the intake air to be warmed by the exhaust manifold. E10 fuel should help keep the inside passages from freezing up but might need the mixture richened slightly for best running.
Gerald J.
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Posted By: Dave H
Date Posted: 03 Apr 2015 at 7:24am
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I would not even give it a second thought unless it is effecting engine performance.
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