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Onan Gets Hot And Dies

generater onan overheating

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#1 davewwd



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Posted 26 November 2012 - 08:48 PM

I have an Onan Emerald 3 gen set on my 1981 Holiday Rambler. I bought it a couple months ago.

I went to start onan and ended up replacing the circuit board fuel pump, and air filter. I changed the oil, filter, and spark plugs. I ran a new fuel line to tank and put a new muffler on it. I took carb off, and cleaned it. When I start it, it sounds really good, runs for about 25 minutes, and sputters for about 10 seconds and dies, with little to no load. The engine was around 280 deg.F. I noticed mice nest around engine, I cleaned alot of nests out, blew it out with air. Started again, runs for about 25 minutes, sputters and dies, still hot.

Also, on dipstick, do I check oil level by screwing it in or just resting on the threads?
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#2 desertdeals69


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Posted 26 November 2012 - 10:07 PM

I believe its screwed in. It sounds like some of the cooling fins are still blocked. You should have a huge amount of air blowing out the bottom. Take off all the sheet metal to make sure all the fins are clear.
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#3 BeauK



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Posted 11 January 2013 - 09:38 PM

Had the same problem 2 years ago with my dads unit. I replaced everything, I even replaced the carb, after $800.00 in parts I took it to the repair shop. They worked on it for 2 weeks and could not find the problem, ended up being a small hole in the intake gasket and when the generator heated up the gasket would expand and it would "suck" too much air and choke out. If I would have thought or noticed this earlier would have been less than $20.00 repair. Try it! Good Luck.
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