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Onan 15.0JC-3CR/8457AA


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  #1  
Old 10-14-2017, 09:55:30 AM
EICBob EICBob is offline
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Default Onan 15.0JC-3CR/8457AA

Greetinga all....
I am looking at this as an addition to my collection, the owner indicates it needs a starter and a gas tank. Was wondering if this is a Magneciter style or not. Also if it could be converted to tri-fuel?

Serial number is 0874848264

Thanks in advance!

-Bob
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Old 10-14-2017, 10:03:28 AM
JT240Z JT240Z is offline
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Default Re: Onan 15.0JC-3CR/8457AA

Not Magniciter if I read the year and spec series correctly. Looks to me like an 87 model and series AA. That would mean it's a YD Generator head. Just picked one up myself. What do you plan on doing with it? Mines going to be standby for the house.
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Old 10-14-2017, 11:27:44 AM
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Jim McIntyre Jim McIntyre is offline
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Default Re: Onan 15.0JC-3CR/8457AA

Quote:
Originally Posted by EICBob View Post
...Also if it could be converted to tri-fuel?
Yes. I don't wee what ANY gas engine with a carb couldn't be converted.
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Old 10-14-2017, 11:56:48 AM
nothingbutdarts nothingbutdarts is online now
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Default Re: Onan 15.0JC-3CR/8457AA

Someone of higher power here just might be able to post a build sheet for this set and we could maybe even see what type of carb. it has????

The serial # might not be correct? Are you sure the first number/letter is an o??? I kind of think it's age is 1987 but the O is making me unsure. However the spec. of AA is a newer late 70's into the 1980's spec I think.
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Old 10-14-2017, 01:07:18 PM
EICBob EICBob is offline
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Default Re: Onan 15.0JC-3CR/8457AA

If I can swing the deal it will be my backup power plant for my house.
Here is a pic of the data plate

-Bob
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Old 10-14-2017, 01:16:35 PM
len k len k is offline
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Default Re: Onan 15.0JC-3CR/8457AA

Sounds like a lot of power for a house unless you want to run lot of electric hi-power loads at once. Stove, oven, dryer, water heater, A/C .....

15 JC will use ~ 1 gal/hr no-load gasoline, and 2.4 full load
7.5JB ~ .6 no-load and ~1.2 full load

7.5JB will start a 3 ton A/C
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Old 10-14-2017, 02:00:30 PM
EICBob EICBob is offline
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Default Re: Onan 15.0JC-3CR/8457AA

Hi Len
I have 7.5 JB that I recently got working and that was going to be my backup plant.

Also just got a 4.0 CCK as a salvage from my old employer, this 15.0 would be nice to have, providing that as I mentioned the deal works out.
Would have to figure a way to get it home

My home does not have electric heat, but does have, as a lot of us in New England, a deep well water pump that on start up tends to irritate generators a bit. I also have the usual cast of things like the furnace, pellet wood stove, the refridge and freezer, some servers running my web services and of course lights.
Kinda like to have enough head room in standby plants.

-Bob
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Old 10-14-2017, 02:34:35 PM
nothingbutdarts nothingbutdarts is online now
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Default Re: Onan 15.0JC-3CR/8457AA

OK, I was wrong, looks like August 1974 build. This might be a Magniciter. Is there another tag on it or do you have a picture of the control box? If there is a penthouse mounted on top of the control box it is a YD end, if no penthouse than Magnaciter.
Also usually there is another tag with magniciter ID numbers as well.

I do have a June 1974 build JB that is a YD end and a spec. AA.

Which would you prefer????
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Old 10-14-2017, 02:37:31 PM
len k len k is offline
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Default Re: Onan 15.0JC-3CR/8457AA

If you need the power you need it. My point was with a JC you'll need double the fuel tank size for same run time as JB. Even at no-load JC is almost double JB's thirst.

spec Z was last magnaciter

spec AA should be a YD genhead with electronic voltage reg in penthouse over the control box.

Don't know wells , but would guess JB can start it. Since it can start a 3 ton A/C (~ 88 locked rotor amps), even before he cleaned demand reg vent to make it respond better. ( nat gas fueled)

Last edited by len k; 10-14-2017 at 03:02:01 PM.
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Old 10-14-2017, 08:17:47 PM
EICBob EICBob is offline
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Default Re: Onan 15.0JC-3CR/8457AA

Hi Darts...
Here are a few more pics of the unit, am still waiting on the owner to say yea or nea on my offer. It does appear to have the penthouse above the control box, along with a few other Franken-engineered add ons!
As for a preference to gensets, since I have not had the joy/pain of a Magnaciter set yet, it is hard to say, but knowing that they get really angry if the magic smoke is let out of the black devices, the ones that contain the PFM variant of magic smoke, I think I would prefer a YD genset.

-Bob
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