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Onan Marine Generator


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  #11  
Old 01-25-2018, 03:45:59 AM
Topman Topman is offline
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Default Re: Onan Marine Generator

Thanks for all the advice.
It apparently starts and runs.
I'll take my multi-meter and a few tools to take apart what I can.
I'll let you know what I find out.
Thanks, Iver.
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  #12  
Old 01-27-2018, 12:39:00 AM
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Default Re: Onan Marine Generator

Okay, I guess I was reading the Cummins engine tag: 3A1. 7-G (M)

The Onan generator tag reads: 12.5 5MDL3J Spec: 25801A
Serial# L910439890

Any idea about this unit?
Any manuals available?
Thanks, Iver.
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  #13  
Old 01-27-2018, 09:19:18 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan Marine Generator

Manuals are available give us time to look everything up. Built in 1991. I believe that is really an old Onan L634. One Onan produced before Cummins bought them out. It is a marine unit and some parts of that engine. Can be hard to find. Cummins called it an A engine.
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Last edited by Billy J Shafer; 01-27-2018 at 09:44:08 AM.
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  #14  
Old 01-27-2018, 10:44:35 AM
MBB MBB is offline
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Default Re: Onan Marine Generator

Copied this over from your initial post.

Topman to make things easier start your own thread. Not sure about that model number. Can you take a picture of the tag and post it in your own thread.

Welcome to the Stak.

Could it be 12.5 MDL3-J/1A

Just noticed you started your own thread. Can be confusing. I will post in the other one.
Last edited by MBB; Today at 08:42:46 AM.

Didnt notice you already posted in your own thread.

Last edited by MBB; 01-27-2018 at 06:32:01 PM.
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  #15  
Old 01-27-2018, 03:51:25 PM
Topman Topman is offline
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Default Re: Onan Marine Generator

Thanks,
Here are the tags.
Iver.
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Name:	Onan tag 2.jpg
Views:	32
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  #16  
Old 01-27-2018, 04:15:48 PM
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Default Re: Onan Marine Generator

1991 is a pretty new machine in the Onan line. It's one that was more of a Cummins than an Onan since Cummins had bouth out Onan a while before yours was built. It looks pretty clean from the couple pictures you posted.
As the tag states it's a single phase 120/240 volt machine. Very desireable voltage.

What are you wanting to know about it?
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  #17  
Old 01-27-2018, 04:20:30 PM
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Default Re: Onan Marine Generator

So that's the correct build sheet. I can post the wiring diagrams and can post a link to the manuals. If there not at the link I think I have them.
I take it back let me check again when I get home I think that's the one I was looking at.
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  #18  
Old 01-27-2018, 04:39:06 PM
Topman Topman is offline
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Default Re: Onan Marine Generator

Thanks everyone for the information so far. This is a great forum.
My intention is to convert this unit from marine to stand-alone with a radiator and use it as a back up generator.
I noticed good information on the marine conversion thread which gives me lots of ideas.
I'm sure I will still have many questions and it is nice to know that help is available here.
Thanks again, Iver.
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Old 01-27-2018, 04:49:03 PM
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Default Re: Onan Marine Generator

Do you have any full pictures of the set? Would love to see them and the smart guys will better be able to help you with suggestions to convert it!
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Old 01-27-2018, 06:16:27 PM
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Default Re: Onan Marine Generator

OK I messed up. Here is the correct build sheet. I also included the wiring diagrams.

Manual number 934-0124 934-0602 934-0229 You can search MDL3 using cntrl+F on your keyboard and see if there are any I missed.

You can download them here.

http://onan.xmsi.net/
Attached Files
File Type: pdf 125MDL3J25801A.pdf (32.2 KB, 15 views)
File Type: pdf 612-6093.pdf (241.2 KB, 12 views)
File Type: pdf 612-6588.pdf (395.6 KB, 17 views)

Last edited by MBB; 01-27-2018 at 06:26:28 PM.
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