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Frost on the Manifold

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JKC

02-15-2004 07:42:05

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I have two tractors that develope a thick layer of frost on the intake manifold above the carberator after the tractor warms up. What causes this? I know that it is not suppose to be that way. Any help would be much appreciated.

Thanks very much.

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Kennyp

02-15-2004 11:40:48

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Re: Frost on the Manifold in reply to JKC, 02-15-2004 07:42:05

Very common. Don't worry about it. If it gets bad enough to kill the engine, just wait a few minutes and restart. Thats why they have "carburator heat" control on small airplane engines. Not very nice when you are coming in for a landing with the engine idleing and it shuts down.

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Chris

02-15-2004 09:31:10

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Re: Frost on the Manifold in reply to JKC, 02-15-2004 07:42:05

You need to wait until a warm day and readjust your carb. It will frost up a little until the engine warms up eough to melt the frost. It will then sweat but won't afect your performance. If the carb is old rebuilding it would probably help alittle too.

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paul

02-15-2004 09:15:52

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Re: Frost on the Manifold in reply to JKC, 02-15-2004 07:42:05

As the gas gets drawn through the carb & turns into a vapor, it draws heat from the air/ metal/ whatever around it.

this chills the metal of the carb, and causes frost to form on the metal.

It's a natural deal, the heat loss always happens. some tractors are known for having too much heat to the carb, they never frost over but they might vapor lock. Others are known for running too cool, and don't vapor lock but will frost over.

About as much frost can form on the inside as on the outside, so you have to consider gasline antifreeze on these machines.

It's often a bigger problem at 40 degrees when it's real humid rather than in dry air when it's 10 degrees.....

Some machines came with shrouds or shutters that helped keep or vent extra heat to the carb.

--->Paul

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old

02-15-2004 08:33:37

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Re: Frost on the Manifold in reply to JKC, 02-15-2004 07:42:05

As Marlow says its common, you can wrap it with foil it helps but is nt a fix, its just part of nature it happens. Another way is to cover the engine area with a tarp or use a heater type cab, cost around $200 and it helps keep you warm also

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marlowe

02-15-2004 08:09:29

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Re: Frost on the Manifold in reply to JKC, 02-15-2004 07:42:05

is this on a massey harris 44 or the likes of so this is common it's due to the cold air being suck in it's just like letting the air out of a tire it will frost up also around the velve stem. you can rap the manifold with fire proof blanket or some type of heat sheald

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