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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

Free Onan NH


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  #1  
Old 09-13-2017, 09:47:42 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Free Onan NH

A friend asked me if I want this, had it in a race car trailer, quit producing, he replaced it. Pictures after I pick it up. Any common failures on these?
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  #2  
Old 09-13-2017, 09:51:33 PM
yellowlister yellowlister is offline
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Default Re: free Onan NH

When they sit to long and you go to start it build up on the slip rings can zap the voltage regulator.. flight system's can fix, they will test it to see what's wrong with it or sell you a new one.

Very good generator aside from that
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Old 09-13-2017, 10:08:56 PM
len k len k is offline
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Default Re: free Onan NH

If its sits and you make AC before cleaning slip rings with schotchbrit $230 AC voltage reg likes to die. Rings oxidize. I found normal ~ 23 ohms between brushes increases to ~ 100 after 3-5 months of sitting. Onan says clean at 30. Onan says run every 30 days. I found once high running it doesn't reduce ohms much, ~10-20 %.

People that let it sit for few years then run , get dead regs, think one person had 300 ohms another 700, But not saying has to be that high to kill it, 300 and 700 might be overkill.

Also has PLASTIC ignition timing arms can break with mud wasps or mouse nest. Can pull ignition model and look down the hole to check before running.

There is a winding performance test to do before buying a reg.

Nice gen I have it in 7NHM version.
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Old 09-14-2017, 06:53:15 AM
KPack KPack is offline
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Default Re: free Onan NH

Yes very bad generator you better let me go get it.
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