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Old 02-26-2015, 06:27 AM   #1
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Older Onan genny winter level

I have an older Onan genny, 1999, and the book says there is a lever on the aircleaner to switch from summer to winter. I looked and damn if i can find it. Anyone can help?
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Old 02-26-2015, 10:59 AM   #2
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I have a 1999 Onan 7.5 genset. If there is such a lever I don't know about it. My genset runs fine in below freezing weather, and in 90+deg. weather. Sounds like it's time to read my manual again.
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Old 02-26-2015, 11:15 AM   #3
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I have an older Onan genny, 1999, and the book says there is a lever on the air cleaner to switch from summer to winter. I looked and damn if i can find it. Anyone can help?
edsperfect
What is the model of your 1999 Onan?

On some Onans the "summer/winter control" can be found on the air cleaner cover.

Here's one:




Here's another:




BTW, my 1996 Onan NHEF-FA63753M "propane fueled" has NO "summer/winter lever".

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Old 02-26-2015, 11:17 AM   #4
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I have an older Onan genny, 1999, and the book says there is a lever on the aircleaner to switch from summer to winter. I looked and damn if i can find it. Anyone can help?
Never heard of that. Does it also have an altitude adjustment?
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Old 02-26-2015, 02:26 PM   #5
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I don't have one either. Runs like new, winter/summer 306 hours.
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Old 02-26-2015, 03:24 PM   #6
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I think those are only on the gas models. Preheats the intake air by routing a bit of warm air to the carburetor as I recall to keep them from running so rough in cold weather. Shouldn't be used above 50 degrees.


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Old 02-26-2015, 03:27 PM   #7
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Sorry, forgot to say it is a small butterfly in the intake air and will have a two position lever.


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Old 02-26-2015, 04:22 PM   #8
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I think those are only on the gas models. Preheats the intake air by routing a bit of warm air to the carburetor as I recall to keep them from running so rough in cold weather. Shouldn't be used above 50 degrees.


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Now it makes sense, thanks duo. I didn't remember reading anything about a lever in my manual.
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Old 02-26-2015, 04:56 PM   #9
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I think those are only on the gas models. Preheats the intake air by routing a bit of warm air to the carburetor as I recall to keep them from running so rough in cold weather. Shouldn't be used above 50 degrees.
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That would be only on the "GASOLINE" models.
As i said my propane "GAS" Onan doesn't have a summer/winter lever either.
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Old 02-26-2015, 05:33 PM   #10
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I don't know where it would get the warm air from. i think it keeps the chock open longer
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Old 02-26-2015, 06:45 PM   #11
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My Onan 1999 5.5 kw gas model has both a winter/summer lever on the air filter box and an altitude adjustment on the float bowl.
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Old 02-26-2015, 06:51 PM   #12
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That is gasoline, not propane. Instructions are to use winter setting below 40 degrees, either setting 40 to 70 degrees and summer above 70 degrees.
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Old 02-26-2015, 07:57 PM   #13
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Mel you are correct. I meant gasoline but was lazy on the typing.


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Old 03-03-2015, 07:22 PM   #14
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Older Onan genny winter level

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I don't know where it would get the warm air from. i think it keeps the chock open longer
It draws air from between the cooling vanes on the cylinder head via a flexible hose loosely fitted under the heads heat shroud.. This heats the intake air soon after startup.
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