| Onan Exhaust issue [message #295596] |
Tue, 16 February 2016 09:34  |
jknezek
Messages: 1057
Registered: December 2007
Karma: 5
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Senior Member |
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So before our trip I fired up the Onan for its weekly exercise. I heard a horrible clinking noise and went to check on the problem. Found the exhaust bracket was loose to the point of falling off. I tightened up the exhaust bracket, assuming the problem was solved, fired up the generator, and heard an incredible roar. I know Onans are loud, but this was ridiculous. Pulled it back out of its home and immediately saw the problem.
The exhaust had come loose from the manifold. It appears the flange that goes into the manifold simply rotted, rusted, and vibrated apart, probably not helped by the loose bracket. Any thoughts on how to fix this problem? I'm wondering if I should just up and buy a new exhaust for the Onan as otherwise it is running great, but I guess I need to find someone to do the work.
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: Onan Exhaust issue [message #295609 is a reply to message #295596] |
Tue, 16 February 2016 12:39  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Jeremy
The original exhaust had a flange with a short -- approx 2 inch -- extension. The down pipe was a slip fit at both ends.
You could remove the pieces and have it welded at a muffler shop.
http://www.gmcmhphotos.com/photos/winterizing-the-onan-generator/p2260.html
Dennis
jknezek wrote on Tue, 16 February 2016 09:34So before our trip I fired up the Onan for its weekly exercise. I heard a horrible clinking noise and went to check on the problem. Found the exhaust bracket was loose to the point of falling off. I tightened up the exhaust bracket, assuming the problem was solved, fired up the generator, and heard an incredible roar. I know Onans are loud, but this was ridiculous. Pulled it back out of its home and immediately saw the problem.
The exhaust had come loose from the manifold. It appears the flange that goes into the manifold simply rotted, rusted, and vibrated apart, probably not helped by the loose bracket. Any thoughts on how to fix this problem? I'm wondering if I should just up and buy a new exhaust for the Onan as otherwise it is running great, but I guess I need to find someone to do the work.
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Onan Exhaust issue [message #295610 is a reply to message #295609] |
Tue, 16 February 2016 12:45 |
jknezek
Messages: 1057
Registered: December 2007
Karma: 5
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Senior Member |
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Dennis S wrote on Tue, 16 February 2016 13:39Jeremy
The original exhaust had a flange with a short -- approx 2 inch -- extension. The down pipe was a slip fit at both ends.
You could remove the pieces and have it welded at a muffler shop.
http://www.gmcmhphotos.com/photos/winterizing-the-onan-generator/p2260.html
Dennis
Thanks Dennis. The lower part is still in the exhaust. I'll take the top apart and see if I can find the rest. I don't think there is enough metal left to have it welded back together but maybe they can make me a replacement. I'm going to go over the whole exhaust pretty close and see if it needs to be replaced. That was the info I was looking for so I appreciate it.
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: Onan Exhaust issue [message #295612 is a reply to message #295596] |
Tue, 16 February 2016 14:12 |
jknezek
Messages: 1057
Registered: December 2007
Karma: 5
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Senior Member |
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Mountain out of a mole hill. Got on the phone with Jim Bounds and he's going to ship me the exhaust adapter/flange/downpipe fitting whatever you want to call it with the gasket. Sometimes the easiest solution is the best. I can't tell you how much I appreciate our suppliers. When I have the exhaust off I'll check the rest of the corroded pipes for problems and see if it is time to replace it all...
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: Onan Exhaust issue [message #295666 is a reply to message #295596] |
Wed, 17 February 2016 20:01 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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The biggest problem with Jim Ks Applied GMC website is he can and does not show everything he stocks or has access to. He also has access to some used stuff. So if you do not find what you want on his site, Give him a telephone call. He probably has or can get what you want.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Onan Exhaust issue [message #295671 is a reply to message #295666] |
Wed, 17 February 2016 21:00 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Ken,
Thanks and your very correct, there is no way we can put up all the parts.
We are an Authorized Service, parts, and sales Dealer for ONAN.
Must have double talked Cummins Onan many years ago.
Oh, if you go to our sight, by double and triple clicking on the pictures,
it comes out larger.
On Wed, Feb 17, 2016 at 6:01 PM, Ken Burton wrote:
> The biggest problem with Jim Ks Applied GMC website is he can and does not
> show everything he stocks or has access to. He also has access to some
> used stuff. So if you do not find what you want on his site, Give him a
> telephone call. He probably has or can get what you want.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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