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Need help from you old dogs... Onan Emerald


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Old 01-01-2018, 11:36:00 PM
jslarson jslarson is offline
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Default Need help from you old dogs... Onan Emerald

Finally got fuel to the generator, previous owner apparently was edward scissor-hands with the fuel lines underneath....

First trip out last week, had been tuning it up at about 300 feet sea level and 50 degrees. Took it to the mountains, 4500 feet and 20 degrees.

While this problem could have been happening before at home and I just didn't realize it, what I did notice in the mountains was that I could hear a switch going back and forth every 5 seconds or so in the oven range hood area, which I think has a transfer switch in it.

NO issues when hooked to shore power (even at that altitude/temp), and no issues when I plugged into a cheap happy home owner generator off to the side.

I FEEL like it's a voltage or Hertz issue...but I want some experts to chime in.

Unfortunately we got back today and when I went to try it while the sun was still up it appears my gas tank is too low to feed the generator (it's off the tank floor so you don't run the RV out of gas but you knew that).

Shoot away please!!

Happy new year to you all... second post for help, read about 500 over the last year. I appreciate everyone's dedication to this board.
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Old 01-01-2018, 11:44:23 PM
Wayne 440 Wayne 440 is offline
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Default Re: Need help from you old dogs.. Onan Emerald

Quote:
Originally Posted by jslarson View Post
...I FEEL like it's a voltage or Hertz issue...
You may get more useful answers if you provide measurements of those parameters.
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Old 01-01-2018, 11:53:36 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Need help from you old dogs.. Onan Emerald

Gonna need more information than that. But sounds like it was running to lean.
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Old 01-02-2018, 12:04:43 AM
len k len k is online now
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Default Re: Need help from you old dogs.. Onan Emerald

Need more info.
Please post full model and serial number.
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Old 01-02-2018, 09:45:29 AM
jslarson jslarson is offline
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Default Re: Need help from you old dogs... Onan Emerald

Onan Emerald I

4BGEFA26100F

As soon as I am able to get some gas in it I will fire it up and get some voltage numbers.

I need to educate myself on hrtz readings and how to take them, as I honestly have never done that.
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Old 01-02-2018, 10:57:14 AM
nothingbutdarts nothingbutdarts is offline
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Default Re: Need help from you old dogs... Onan Emerald

Get yourself one of these Kill A Watt meters, they are pretty cheap and VERY HANDY! They read, volts, amps, HZ and more. They are only rated for like 1500 watts but, still handy for HZ and measuring small loads.

On a 4 pole generator such as yours, 60 HZ is equal to 1,800 RPM.

https://www.amazon.com/dp/B00009MDBU...a-306572288073
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Old 01-02-2018, 12:59:23 PM
len k len k is online now
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Default Re: Need help from you old dogs... Onan Emerald

your gen is spec F

Disconnect AC voltage reg or wires to slip ring brushes and measure ohms brush to brush. Should be 20.25 -24.75 ohms and infinte to frame.

Then clean slip rings with Scotchbrite pad and re-measure brush to brush ohms.

For future If it's been sitting first thing to do before making AC is clean slip rings to protect $$ Ac voltage reg VR1. Onan says run once a month. In my testing I found 100 ohms after 3-5 months. Onan says clean >30 ohms

Last edited by len k; 01-02-2018 at 08:34:07 PM.
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Old 01-02-2018, 08:21:25 PM
jslarson jslarson is offline
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Default Re: Need help from you old dogs... Onan Emerald

Thanks for direction everyone.
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Old 01-06-2018, 04:36:23 PM
jslarson jslarson is offline
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Default Re: Need help from you old dogs... Onan Emerald

Thank you friend... that Kill A Watt is the best $18 tool I have ever owned.

With that I was able to tune the right hertz and volts... I have it at 500 ft altitude, will be able to adjust if needed when we go back up to the mountains with the tool.

Thanks again
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Old 01-06-2018, 08:49:03 PM
len k len k is online now
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Default Re: Need help from you old dogs... Onan Emerald

Being spec F it has an electronic voltage reg, so I would expect voltage to stay spot on, unless rpm dropped drastically.

However at high altitude lack of oxygen will make mixture rich, that will result in less power. Maybe lower RPM ( thus hz) under load. So will want to lean out main jet (bottom of carb bowl). Leaner is likely clockwise when on ground and looking UP at the carb. The correct way to adjust the main jet is apply full rated load and adjust for best power. Few hair driers and space heaters will quickly get you to full load.
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