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Carb icing on B

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Brian

10-17-2001 17:41:42




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during the winter i can run it for about 30 minutes before it starts running bad and usually the card is iced over




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redbone76

08-21-2005 12:13:40




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 Re: carb icing on B in reply to Brian, 10-17-2001 17:41:42  
Carb icing is normal in colder climats. The gas is vaporizing or evaporating and just like water on your skin it cools as it evaporates. Should the condition cause water in your carborator to freeze use a de icer that contains methanol or iso propal alcohol.



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G Taylor

10-19-2001 10:46:19




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 Re: carb icing on B in reply to Brian, 10-17-2001 17:41:42  
If the oilbath aircleaner is plugged the pressure drop in carburator will be greater than normal. This will cool the air even more & contribute to more & faster carb icing. As every oil bath I've ever seen, when the internal mesh removed it was loaded with oily mud from 1/4 to 3/4 of the way up. What kind of manifolds are on the "B"?



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G Taylor .. I stand corrected

10-19-2001 21:58:06




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 Re: Re: carb icing on B in reply to G Taylor , 10-19-2001 10:46:19  
One of the other board members brought me up to speed on a couple of points. While the B may or maynot have a somewhat restricted aircleaner this would contribute so little to carb icing that factor can be ignored.



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luke

10-18-2001 13:45:33




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 Re: carb icing on B in reply to Brian, 10-17-2001 17:41:42  
here in north dakota, this is a common deal. get some heating duct about 2-3 inches larger than your muffler in diameter and nearly to the top. put a top on the duct and cut a hole in it for the exhaust. solder a 3" fitting on the side of the duct toward the top of the duct. now you need to make a get a hose and get it over your intake which may be a task on a B. you will need some sort of pvc adaptor from 4-3" or so so ther eis room for air to enter the intake. somehow you need to get the air warmed from the exhaust in the ductpipe to the intake of the tractor.
best of luck
luke

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RayP(MI)

10-18-2001 05:46:55




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 Re: carb icing on B in reply to Brian, 10-17-2001 17:41:42  
Our '47 B had the same problem, and the dealer changed the manifold to a "warmer" unit, and the problem seemed to go away. That was when the tractor was practically new, so I can't give you any other details. Tractor is long since in some boneyard. Maybe some one else on the board can come up with the part numbers. good luck on finding one though!



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Clooney

10-17-2001 18:02:48




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 Re: carb icing on B in reply to Brian, 10-17-2001 17:41:42  
Brian, you didn't say what year "B" or if it is a gasoline or all-fuel. If it is a late "B" or gasoline only that seems to be a common problem at times. I have seen tin heat shields made to warm the carb, all-fuel manifolds installed because they keep the intake & carb base warmer & side shields used to keep engine heat in. I have a late "B" that I will occasionally use to plow snow or haul wood with & don't have an icing problem with it but it has a good working set of shutters to keep the engine heat up around 190* & I keep the RPM's up near high idle in cold weather to prevent moisture buildup in the crankcase. If you don't have working shutters you might try to get them working of cover part of the radiator & keep the idle up so the air isn't flowing through such a small orifice at the throttle plate area or build some type of heat shield to keep the carb warm with exhaust heat.

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Brian

10-18-2001 03:45:58




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 Re: Re: carb icing on B in reply to Clooney, 10-17-2001 18:02:48  
its a 48 b gas and shutters do work



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