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Onan Generators

Onan 12 MDJC - 3r/2268d (1985)


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  #11  
Old 08-03-2017, 11:18:09 AM
sscummins sscummins is offline
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

Thank you very much, I dont know much about schematics or print reading, can anyone break down what the 5 or 6 wires and where they connect too? I dont want to wire something to something it shouldnt be wired to on the block? you all have been very kind by finding and sharing already, Many thanks again in advance.
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  #12  
Old 08-03-2017, 11:23:46 AM
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

I hate to kind of say bad news but, the way your control box looks all green and rusty from corrosion I might send a PM to BigBlock and ask him if he might have a MDJC control box that is in better shape that he might want to sell. Just saying. If nothing else yours needs to be pulled off and totally cleaned up.
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  #13  
Old 08-03-2017, 01:05:35 PM
sscummins sscummins is offline
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

Yaeh I was thinking something like that but the funny thing is, when I bought it, I hooked a battery up to it and it cranked over great, and the injector pump needed to be rebiult and I through the injectors in with it and sent them to accurate diesel in florida, and Tim did a great job on them for a couplwe hundred bucks. I will PM him and see what he has to offer. Thank you.

---------- Post added at 10:05:35 AM ---------- Previous post was at 09:58:19 AM ----------

what is his name? I typed in BigBlock but it did not find that name?
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  #14  
Old 08-03-2017, 01:17:07 PM
PnishrPW PnishrPW is offline
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

Bigblockchev is his user name, Dan is a good guy.
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  #15  
Old 08-03-2017, 01:28:32 PM
sscummins sscummins is offline
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

Thank you. I appreciate it
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  #16  
Old 08-03-2017, 02:12:09 PM
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

Is this a critical use application? In a boat where NEEDED while out on the water? Just curious?
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  #17  
Old 08-03-2017, 02:59:44 PM
sscummins sscummins is offline
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

The guy I bought it from through in an exhaust manifold (Non Marine) and the top water inlet connection for the heads and I changed it to be a back up for my home. He also included a spare head which later looking at them all, they are interchangeable from the looks of them.
But back to your question, it will be easily available to tinker with. from the sounds of alot of people here and in general these units are pretty durable and long lasting. Whats your opinion on them? Oh also I might be interested in selling the manifold for this marine application, I should put it on the for sale board right? what do you think someone would pay for it, it seems to be in very good and clean condition.
Thanks
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  #18  
Old 08-03-2017, 05:46:03 PM
grif grif is offline
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

How you cooling it for home use?

There have been several threads in the recent past about fans, radiators, raw water and so on.
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  #19  
Old 08-03-2017, 06:10:36 PM
sscummins sscummins is offline
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

hi Grif,

When I bought it, he threw in a spare head, exhaust manifold (non marine) and the top head inlet/manifold for water, this was started to be fresh water cooled with still the marine setup, so I changed it over to fresh water and it had a radiator mounted on the front of it.
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  #20  
Old 08-03-2017, 07:09:47 PM
PnishrPW PnishrPW is offline
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Default Re: Onan 12 MDJC - 3r/2268d (1985)

Just out of curiosity, what are you using for a radiator?

Federal Way? I used to live in the Twin Lakes area, now down the hill in T-town.
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