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Old 10-17-2011, 07:30 PM   #1
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onan 4.0 generator problem

Ive got an 84 oran 4.0 rv generator and it putting out 180 volts with no load on the generator. The generator had been setting for 2 year so i changed the oil.spark plugs and ran a can of sea foam in a gal of gas. The generator was hunting or surging up and down. I could clamp the choke about a third of the way closed and it will run smooth. The question i have is by me holding the choke am i causing the generator to run at a faster rpm and is the the cause for the higher voltage.? Ive not ajusted the carb because i dont want to damage anything. Oman M#4.0 BFA -1R/16004C S#E843784526

Thank guys for any help
Jim|
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Old 10-17-2011, 08:51 PM   #2
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I was hoping someone might be able to help me fine a owners manual and a repair manual.
Thanks again.
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Old 10-17-2011, 08:55 PM   #3
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I've got the same model: Here ya go... BFA Onan Manual
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Old 10-17-2011, 09:02 PM   #4
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Try spraying the governor linkage with WD to free things up a bit, as I've had that fix the "hunting" problem, before. Once it begins to run smoothly, let it run for a good while to get all worked in, then check your voltage. If it's still "off", you may need to clean the sliprings- they oxidize over long periods of non-use, and the poor results thereof can swing both ways.
Also, remove the choke cover and make sure things are clean, tidy and nest-free in there- spiders and daubers both seem to love it in there.
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Old 10-17-2011, 09:14 PM   #5
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Thank you so much.this should be a big help. I love reading everything about this RV.
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Old 10-17-2011, 09:17 PM   #6
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I've got my RV in the shop getting seats and carpet replaced. Should have it back Fri or sat. This book is going to be a big help to me.
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Old 10-17-2011, 09:19 PM   #7
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Your carb is dirty.. gotta pull it and clean it...
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Old 10-17-2011, 09:33 PM   #8
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Will i need to break the carb down ot clean it? Im pretty handy but i dont know zeroing the carb adjustments. It its just breaking it down and reassembling then I'm OK.
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Old 10-18-2011, 05:08 AM   #9
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if the link you got doesnt show how to adjust the air and fuel let me know ill pull my book out its simple mine is a 1985
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Old 10-18-2011, 06:44 AM   #10
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To take mine out, I had to pull the manifold with it. there just wasn't enough room for me to manage to unbolt the carb from within. open it up, clean it well and blow out the orifices. If you take note of the exposed threads on your mixing screws, returning them to those positions SHOULD be sufficient.
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Old 10-18-2011, 03:51 PM   #11
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The only real thing to watch out for is the float pin. Depending on the model of carb, it can fall out really, silly, easy..

Once out, pull the float, watching out for that pin, and spray every little hole you can find with carb cleaner..
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Old 10-18-2011, 06:22 PM   #12
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Amen, Jim!
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Old 10-18-2011, 08:42 PM   #13
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I'm going to pull the carb this weekend and give it a good cleaning. Thanks so much for everyones help. I really love this site.

Jim
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Old 10-19-2011, 07:49 PM   #14
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Boy, if we all had a dollar for missing float pins.................ronspradley
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