Carb on F-20 freezing up.

SproutW · Nov 11, 2008

Well I hooked up my newly rebuilt F-20 on the auger today. Slight drizzle of rain in the mid to upper thirties for weather conditions. After 20 to 30 minutes of running on the auger, the carb was all iced over and she stopped running on me. After about ten minutes or so she popped right off and ran again for another 20 minutes or so. The tractor ran great all summer so I imagine I have an adjustment issue on the carb. What causes the freezing carb? Do I have the carb set to lean or to rich? Thanks for any help. I've attached a video of what the carb looked like five or ten minutes before she froze up and quit. Any and all help appreciated.

http://s509.photobucket.com/albums/s336/1937F-20NT/?action=view&current=bc0ddd01.flv

Anonymous-0 · Nov 11, 2008

Perhaps it is not the carb but the magneto getting wet.... the condition of the carb freezing over just shows you have good air flow and engine is breathing good... try covering the mag so as not to let it get wet ???? this might explain why it didn't quit when it was nice out ???
good luck

rustyfarmall · Nov 11, 2008

What happened is pretty much normal. Humidity and temperature at that magic point and carburetors will frost up. Try wrapping a piece of tin or similar around the carb so that the heat from the engine will warm up the carb also.

Andy Motteberg · Nov 11, 2008

I tried your link and it won't work. Photobucket just shows an error. I just got in the house now, I put the snow bucket on my H loader and my H has always had a problem with the carb icing up too. It does not effect the way any of our tractors run, except my H. When the carb gets iced up, the tractor will not run right at all. I had to make this setup to keep the ice off the carb.

Allan in NE · Nov 11, 2008

Yep,

They ice up inside and out and will totally choke themselves off if the air conditions and temp are just right.

Let 'er warm up a little before ya put it to work.

Allan

Old-F20 · Nov 11, 2008

put a piece of cardboard over the bottom half of the radiator. let it idel and wamr up for about 30 minutes. leave the winterfront on when you start to work it for a couple of minutes til its real warmed up. block the raditor as neede after that. My W-30 does the same thing and it just comes down to the fact that its cold blooded, its cold and humid outside, and its running a gas manifold 8)

Anonymous-0 · Nov 11, 2008

possible to duplicate the old distillate heat shrouding or make up shroud around carburator and exhaust manifold to prevent icing.Intake to aircleaner preheat could be made -Exhaust pipe shroud and intake hose to aircleaner would get some warm air to inside of carb. RN.

Fixer · Nov 11, 2008

My M was doing that last winter. I found a couple of cans of Heat in the gas tank helped immensely. Bernie Steffen

SproutW · Nov 11, 2008

Thanks for all the tips guys. I will be sure to block up that radiator and get her good and warm next time. Hopefully we won't have those same problems in the future. If so I will find a way to direct the heat from the block to the carb.

LenNH · Nov 20, 2008

Airplanes have this problem all the time. The carburetor venturi cools the air down below the freezing point and makes ice out of the moisture in the fuel/air mix. There is always some kind of heat diverter (from the manifold, I think) called "carb heat." Pilots turn on the heat when they slow down the engine, or if they sense that the engine is losing power.
Make a shield of some sort around your manifold and carb? Don't know if the heat would flow down, but it shouldn't take much to keep it from icing up.

LenNH · Nov 20, 2008

Sorry, RN, I didn't read your note carefully enough. You had a better suggestion than mine.

Carb on F-20 freezing up.

SproutW

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Anonymous-0

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rustyfarmall

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Andy Motteberg

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Allan in NE

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Old-F20

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Anonymous-0

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Fixer

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SproutW

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LenNH

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LenNH

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