The problem occurs at temperatures near the freezing point. Ice on the outside does not cause any problems. Ice buildup on the inside is what causes the engine to stumble as it blocks the proper air/fuel flow. The problem occurs because the venturi creates a drop in air pressure in the carb throat. This drop in pressure creates a refrigeration effect cooling the air enough for ice to form. The problem is worst when the tractor is used under light loads. If the problem is bad enough it can cause the throttle to freeze open allowing the engine to over speed when the load is decreased.
The factory solution to the problem is to have two small holes in the bottom front corners of the exhaust manifold to blow some exhaust down in front of the carb. The air front the radiator fan then blows this hot exhaust past the outside of the carb. If you will look closely at the the manifold I sure you will find these holes are plugged. Cleaning them out almost always cures the icing problems.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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