| [GMCnet] Onan Troubles [message #55681] |
Fri, 04 September 2009 19:29  |
George Zhookoff
Messages: 398
Registered: December 2004
Location: Snellville, GA
Karma: 6
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Senior Member |
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Well we're here at the Atlanta NASCAR track, infield Flock space 766. If you're here stop by.
I promised myself after the spring motorcycle race I'd work on the Onan. Oh well. It starts when cold runs 10-15 minutes under load. Then starts to hunt still the low end of the hunt is so low it shuts down.
So any advice while sitting here?
George Zhookoff
78 El II
Hampton, Ga
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| Re: [GMCnet] Onan Troubles [message #55700 is a reply to message #55681] |
Fri, 04 September 2009 21:40  |
klassic kampers
Messages: 93
Registered: July 2008
Location: greer,s.c./ellijay,ga
Karma: 0
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hard to fix not being there.............normally a gasoline engine tht runs well cold but then runs bad when warm is too rich(on fuel)..........if that's the case here, you can check the adjustment screw in the side of the float bowl to see if it has backed out which would fatten up the mixture......be sure the air filter is clean...........
...the other end of this is the engine could be starving for fuel with the situation being enough fuel can flow for 15 minutes and then a foreign substance( trash) begins to block the fuel supply.....to check for that situation you can slightly close the choke when the engine begins to hunt and if runs better then you are experiencing a fuel restriction.........unscrew the bottom of the fuel pump and check for junk.......if the fuel line from the tank or the actual fuel pick up in the tank is suspect you can hook up an auxillary tank( like off a lawn mower or motorboat) and run the onan.......this is just the possible engine problems and not an actual 120V generator diagnosis.......
good luck, mike stewart, greer.s.c.
Mike Stewart
1973 GMC 26' Canyonlands /
1973 B.S.A. B50 street tracker-----
Greer,S.C/Ellijay,Ga
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| Re: [GMCnet] Onan Troubles [message #55728 is a reply to message #55700] |
Sat, 05 September 2009 07:24 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| klassic kampers wrote on Fri, 04 September 2009 19:40 |
... you can check the adjustment screw in the side of the float bowl to see if it has backed out which would fatten up the mixture ...
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I had one that would "adjust" itself with the vibrations. (6k in the '73) I was always having to readjust it. I replaced the o-ring on the needle like adjusting screw. Now it stays adjusted.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| [GMCnet] Onan Troubles [message #60959 is a reply to message #55681] |
Wed, 21 October 2009 12:52 |
George Zhookoff
Messages: 398
Registered: December 2004
Location: Snellville, GA
Karma: 6
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Senior Member |
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Subject: Onan Troubles Labor Day Weekend
Well we're here at the Atlanta NASCAR track, infield Flock space 766. If you're here stop by.
I promised myself after the spring motorcycle race I'd work on the Onan. Oh well. It starts when cold runs 10-15 minutes under load. Then starts to hunt still the low end of the hunt is so low it shuts down.
So any advice while sitting here?
George Zhookoff
78 El II
Hampton, Ga
UPDATE:
New air filter, oil change & filter, new plugs, new mounts, pulled heads and blasted them. Bought EZ Kill a Watt and installed.
Read and acted upon Emery's advice.
"The original O ring on that high speed jet in the carb bowl was a
square shouldered one. I found many years ago that a 1/4" OD x 1/8"
ID regular O ring would work fine.
<<>>
Emery Stora
77 Kingsley
Santa Fe, NM
Watched the Mr. Onan DVD several times.
Cranked it up volts +/- 131. Adjusted carb to where it runs smooth. Then adjusted volts to 125 +/- a touch.
New o ring replaced cut and damaged older ring.
It all works like a champ now. I'm looking for more AC appliances to plug in to task the output. Right now 2 ACs, Microwave, PD, and coffee pot have little impact on the output.
Thanks to all that responded to my email question.
George Zhookoff, PMP
78 EL II
Snellville, GA
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