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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

A Genset Story Onan 6.0 DJB


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  #11  
Old 02-14-2017, 11:02:25 PM
JohnnyC JohnnyC is online now
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Default Re: A Genset Story Onan 6.0 DJB

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Originally Posted by Crankpot View Post
I added a little voltage control to the genset today. The regulator has a different type wiring and I couldn't find a pin out. But the part had a jumper between pins 6 and 7. This is where the potentiometer connects. I used a little 2000 ohm one. It's works great and gives a 30 volt swing. I set the mid point voltage to 120 v using the trimmer in the potted regulator. Sweet! Cost $.30.
LOL - You and I were doing the exact same thing at the same time this evening. I updated my thread with pictures. Since I need to finish the JB I won't be able to run it. So, you get a 30 volt swing. That is a lot. What are the specs on the pot you used? I am using a 2.5k Ohm pot. Once I get my JB running, I will need to "tune" the regulator as you did this evening.

p.s. - I read your response about the lettering today. I will post the size of the lettering with pictures tomorrow evening in my thread. Thanks!

********** Update - I just seen you used a 2k Ohm pot. That's what happens when I read too fast, I miss important things. Since I am using a 2.5k Ohm pot I wonder what my adjustability will be?

JohnnyC
New Jersey
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  #12  
Old 02-14-2017, 11:09:38 PM
Crankpot Crankpot is offline
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Default Re: A Genset Story Onan 6.0 DJB

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Originally Posted by JohnnyC View Post
LOL - You and I were doing the exact same thing at the same time this evening. I updated my thread with pictures. Since I need to finish the JB I won't be able to run it. So, you get a 30 volt swing. That is a lot. What are the specs on the pot you used? I am using a 2.5k Ohm pot. Once I get my JB running, I will need to "tune" the regulator as you did this evening.

p.s. - I read your response about the lettering today. I will post the size of the lettering with pictures tomorrow evening in my thread. Thanks!

********** Update - I just seen you used a 2k Ohm pot. That's what happens when I read too fast, I miss important things. Since I am using a 2.5k Ohm pot I wonder what my adjustability will be?

JohnnyC
New Jersey
More ohms for more volts. I'm guessing you see 35 volt swing. Mine seems just right. Yours will be better!
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  #13  
Old 02-14-2017, 11:33:41 PM
JohnnyC JohnnyC is online now
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Default Re: A Genset Story Onan 6.0 DJB

I'd be happy with only 10 vac swing (+/- 5 vac from 120 or 240). I believe Jim is using a 5k pot. I hope he reads this and replies with his swing. I can't wait to get my JB all finished to try it out, but as past history has shown (many times) I get very bored after completing an Onan and within hours I'm out the door to pick up another.

Thanks for posting the results for this nice modification.

JohnnyC
New Jersey
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  #14  
Old 02-20-2017, 05:08:19 PM
Crankpot Crankpot is offline
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Default Re: A Genset Story Onan 6.0 DJB

I just finished the super cheapo Generator load bank. I've always wanted one and spend my time running around with extension cords and space heaters trying to come up with a load. Its never been ideal.

I considered different things like hot water heater elements and came up with this. It has the size I need, 6.5 KW, cost little, should be very reliable and easy to fix. Additionally I can add two more heaters to bring it up to 10KW load.

I chose cheap Walmart made in china 1500 watt space heaters. They are low cost, about $11 each. They also have multiple wattage settings, 500,900,1500 so lots of load choices available. I tied them together with a high amperage terminal strip with number 10 wire jumpers etc so nothing would get hot. Then added a little junction box and a couple cheap ebay volt ammeter modules. The whole thing cost less than
$100. Weighs almost nothing, quite portable and it will bring every generator I own to it knees.

My Onan 6.0 KW DJB will put out 6400 watts (sea level 80 deg F) at the smoke limit. I was able to determine this only after adding the variable voltage control to my Genset. Varying the voltage on a resistive load has a double whammy effect on watts produced so a little voltage increase goes a long way. On my onan, 127 volts was it, you could see the rack opening until it hit the smoke limit and had little if any reserve power left as the rpm began to fall off. 6000 watts was no problem as expected, I'll post a picture later...
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Old 02-20-2017, 05:15:37 PM
Crankpot Crankpot is offline
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Default Re: A Genset Story Onan 6.0 DJB

Here ya go...
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Old 02-24-2017, 08:54:32 AM
Crankpot Crankpot is offline
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Default Re: A Genset Story Onan 6.0 DJB

Oops look what happened" the super cheesey and overpriced ($16) little AMBAC plastic part simply shattered.

I made up a permanent replacement using an aircraft grade spherical ball joint. Interestingly, the generator makes a little more power now. I think due to smoother geometry of the linkage. Anyway I can get 7000 watts now with clouds of black smoke!
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Old 02-24-2017, 10:09:34 AM
Max Thompson Max Thompson is offline
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Default Re: A Genset Story Onan 6.0 DJB

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Originally Posted by Crankpot View Post
" the super cheesey and overpriced ($16) little AMBAC plastic part simply shattered.
Not sure why Onan used those plastic ball joints. May be because they require no lubrication with the metal ball against the plastic housing.

I have a bunch of them in the drawer, I make it a habit to replace them on my J sets when I go through them. I had to be careful of how the top ball joint is oriented on the latest JC I replaced them on. The new metal one (like you pictured) is larger than the OEM joint and will rub on the intake manifold if it is not turned just right.
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Old 02-24-2017, 12:40:56 PM
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Default Re: A Genset Story Onan 6.0 DJB

Crankpot you be rollin coal with that little beast. Cheers Dan
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Old 02-24-2017, 03:12:21 PM
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Default Re: A Genset Story Onan 6.0 DJB

Bob, my Ambac pump was trashed when I got my 7.5MDJE. Found a great shop in Orlando who rebuilt it for $200. Accurate Diesel Injection, Inc.
Glad to see another diesel set rescued.
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Old 03-08-2017, 08:27:45 PM
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Default Re: A Genset Story Onan 6.0 DJB

Thanks. That's pretty reasonable. I'm
Going to send my old pump to them and keep it for a spare.
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