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Tractor Talk Discussion Forum

Frost on Carburetor

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Wheatfarmer

05-03-2008 04:09:47




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What is wrong when frost forms just above the carburetor and the engine stalls out.




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buickanddeere

05-03-2008 21:23:42




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 Re: Frost on Carburetor, it's not eveaporation in reply to Wheatfarmer, 05-03-2008 04:09:47  
It's not evaporation. It's gases changing velocity, pressure & temperature due to the carb's venturi.
The problem is just more visible and likely to stall the engine when the humidity is high. More water available to freeze, that's all.



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dave guest

05-03-2008 18:54:00




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 Re: Frost on Carburetor in reply to Wheatfarmer, 05-03-2008 04:09:47  
Did you ever see an air operated refrigerator. Lots of guy used to make them at Cadillac. Company wasn't much in favor. Use a lotta compressed air with venturi pipe.



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MapleStone

05-03-2008 16:35:23




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 Re: Frost on Carburetor in reply to Wheatfarmer, 05-03-2008 04:09:47  
Massey Harris 33s & 44s were notorious for it. Sometime just start it and let it runn till the iceing starts then shut it off and let the heat from the engine conduct down into the intake part of the manifold. Then you can start it back up and go to work.

Dad grew up on a 44 and said this was normal operating procedure for fall plowing. Start the tractor, let it ice up, shut her off and fuel her up and grease everything. By the time you'd fueled and greased and whatever the intake had warmed through and you were off.

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Jerry/MT

05-03-2008 13:12:14




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 Re: Frost on Carburetor in reply to Wheatfarmer, 05-03-2008 04:09:47  
That"s the evaporative cooling effect in the carb throat area and it happens in high humidity situations. It can also cause ice to form within the carb and the engine will run ratty until the intake manifold warms up enough to melt the internal ice. It happens under certain conditions on my Ferguson TO-30 here in Montana but whenI lived in western Washington, it was a regular occurance in the winter. It self clears in about 5 minutes of running on my Ferguson. There"s not much that you can do about it except add heat to the icoming air like the aircraft engines do. Additives are not effective becauseit"s not water in the fuel that causes it, it"s the moisture in the air.
hope this helps you.

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Steven f/AZ

05-03-2008 12:35:35




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 Re: Frost on Carburetor in reply to Wheatfarmer, 05-03-2008 04:09:47  
I have seen setups that draw intake air from around the muffler so the air is heated up in the winter - helps to avoid the frost problem.

I've watched mine frost over several times and never had any trouble with the way they ran, though.



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Kirk / ihcollector

05-03-2008 08:06:44




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 Re: Frost on Carburetor in reply to Wheatfarmer, 05-03-2008 04:09:47  

Wheatfarmer said: (quoted from post at 04:09:47 05/03/08) What is wrong when frost forms just above the carburetor and the engine stalls out.
What you are seeing is normal. Just keep in mind to make sure you have a good gasket between the carb and intake/exhaust manifold to keep the moisture out and only make carb adjustments with the engine at proper operating temperatures.

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bradk

05-03-2008 06:19:29




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 Re: Frost on Carburetor in reply to Wheatfarmer, 05-03-2008 04:09:47  
Like the other said,it's fairly normal for frost buildup.

Now for your problem stalling out.What kind of tractor,what brand carburetor? Dirt in carb and blocked passages are main culprits.



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Allan In NE

05-03-2008 06:38:56




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 Re: Frost on Carburetor in reply to bradk, 05-03-2008 06:19:29  
Frost builds on the inside just as it does on the outside and it chokes off the air.

Let it warm up a few minutes before putting it to work.

Allan



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gene bender

05-03-2008 04:28:26




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 Re: Frost on Carburetor in reply to Wheatfarmer, 05-03-2008 04:09:47  
The carb on the car you used to have did it also you just didnt see it under the hood.



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Nebraska Cowman

05-03-2008 04:24:24




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 Re: Frost on Carburetor in reply to Wheatfarmer, 05-03-2008 04:09:47  
Air drawn trough the venturi causes a cooling effect. (the same way your refrigerator works) In certain weather conditions it will cause frost to form. Like Allan says. It is a fact of life.



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Allan In NE

05-03-2008 04:20:56




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 Re: Frost on Carburetor in reply to Wheatfarmer, 05-03-2008 04:09:47  
Frost on carburetors has been around since carburetors. Absolutely, plumb, certified normal.

Allan



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OliverGuy

05-03-2008 16:43:33




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 Re: Frost on Carburetor in reply to Allan In NE, 05-03-2008 04:20:56  
It happens on our Kohler engines on our mini-skid steers when pushing snow. I blocked off the side of the air filter "horn" (what my Dad called it) on the outside part of the engine and only left the side open on the side of the engine where the exhaust is. Sucks warmer air and works fine now. Just wish my guys would remember to take my blocker off before spring each year.



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