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Onan Generators

What Have You Done to Your Onan Generator Today?


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  #1931  
Old 11-01-2015, 04:14:13 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: What have you done to your Onan generator today?

Dragged the DKD out, installed new fuel filter, got some new diesel with lubricity addative put in it and fired the bad boy up for an hour.
I can only load it with about 23 amps per leg, (using only the two big burners on a house stove) anything more than that and it smokes like a freight train and the RPM just start going down. Not happy with that though. However I do live @ 8,700' so loss is expected especially on a naturally aspirated diesel. I have yet to play with timing to see if it might help.
Oil pressure started @ 60 psi and by the end was about 28 psi.
I was not charging the battery at all, I'll have to check into it's tiny alternator and see why.
Happy Day All!
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  #1932  
Old 11-01-2015, 04:19:47 PM
Vanman Vanman is offline
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Default Re: What have you done to your Onan generator today?

I believe the deration is 3% per 1000 feet? You're way up there, more than 25% derated. What is the rated capacity? Maybe you should fit a tiny little turbocharger

Keith
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  #1933  
Old 11-01-2015, 04:41:27 PM
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Default Re: What have you done to your Onan generator today?

Quote:
Originally Posted by nothingbutdarts View Post
Dragged the DKD out, installed new fuel filter, got some new diesel with lubricity addative put in it and fired the bad boy up for an hour.
I can only load it with about 23 amps per leg, (using only the two big burners on a house stove) anything more than that and it smokes like a freight train and the RPM just start going down. Not happy with that though. However I do live @ 8,700' so loss is expected especially on a naturally aspirated diesel. I have yet to play with timing to see if it might help.
Oil pressure started @ 60 psi and by the end was about 28 psi.
I was not charging the battery at all, I'll have to check into it's tiny alternator and see why.
Happy Day All!
How many amps is it rated to pull full load ?
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  #1934  
Old 11-01-2015, 05:07:11 PM
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Onan Dan Onan Dan is offline
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Default Re: What have you done to your Onan generator today?

Question has any one tried one of those digital Photo Laser Tachometers non touch RPM meter ? would be simple to check the Onans engine speed if they work?
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  #1935  
Old 11-01-2015, 06:04:26 PM
Vanman Vanman is offline
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Default Re: What have you done to your Onan generator today?

Haven't tried a non touch one, but I have a nice old one that consists of a small generator with a variety of rubber drive tips, a removable cord, and a dual range gauge, all in a nice case. Does 0 - 2500 rpm on the low scale and 0 - 5000 rpm on high.

I held it up to my Kohler and it indicated 1300 rpm. Put the Fluke on it and sure enough, 65 cycles....

Keith
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  #1936  
Old 11-01-2015, 08:16:25 PM
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Default Re: What have you done to your Onan generator today?

Quote:
Originally Posted by Kpack View Post
How many amps is it rated to pull full load ?
A DKD is a 7.5 kW set. 23A at 240V is 5.5 kW.

75% of 7.5 kW is 5.6 kW. So there you go....
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  #1937  
Old 11-01-2015, 08:22:05 PM
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Default Re: What have you done to your Onan generator today?

Quote:
Originally Posted by Jim McIntyre View Post
A DKD is a 7.5 kW set. 23A at 240V is 5.5 kW.

75% of 7.5 kW is 5.6 kW. So there you go....
So do you think that altitude is affecting Jim.
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  #1938  
Old 11-01-2015, 08:31:13 PM
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Default Re: What have you done to your Onan generator today?

With no touch you should use a bit of sticky reflective tape on the rotating bit. They work by detecting the reflected beam from their light source. If there are key ways or shaft flats and such you have to play around to get a true read. Usually they will read some multiple of the shaft speed. Like 2x or 3x. Sometimes you can just file a shiny spot on the shaft. Cheers Dan
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  #1939  
Old 11-01-2015, 10:11:27 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: What have you done to your Onan generator today?

Quote:
Originally Posted by Jim McIntyre View Post
A DKD is a 7.5 kW set. 23A at 240V is 5.5 kW.

75% of 7.5 kW is 5.6 kW. So there you go....
So, what do you guys think, would a 7.5JB or a 7.5 DKD have more available amp. output at the same 8,700' altitude or should they both be about the same.
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  #1940  
Old 11-01-2015, 11:09:59 PM
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Default Re: What have you done to your Onan generator today?

I don't have enough experience with DKD's to know. I have one, and as I recall it maxes out at a touch over 7.5 kW. IOW, not a lot of margin. I do not know Onan de-rated them at altitude...

My JB (running on gasoline) will do 10 kW at our altitude, so it seems to have more margin than my DKD.
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