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Need Info on Onan Diesel Generator


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  #1  
Old 12-23-2006, 04:03:26 PM
mikeinnh mikeinnh is offline
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Default Need Info on Onan Diesel Generator

I have an onan single cylinder diesel generator model Number 3MDSP-1R that was a marine unit, I dont know much about it and was wondering if anyone had any info or links to where i can find a manual or parts break down, I have searched and cant seem to find anything on this model gen. Also, this may be a stupid question, but how do you start this rig? doesnt seem to have a starter on it, it just has some short shafts sticking out the engine end. is this a manual start model?. the wiring is a mess as the control box is missing so all i have is a few wires and none look like starter wires.

Any help would be greatly appreciated as i really would love to see this thing run again.

Mike
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Old 12-23-2006, 05:51:28 PM
cat d9 cat d9 is offline
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Default Re: need info on onan diesel generator

That engine uses the exciter winding to crank the engine, that is why you have no starter. I have no manuels but I beleive you can still get them from Onan/ Cummins.
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Old 12-23-2006, 07:05:05 PM
mikeinnh mikeinnh is offline
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Default Re: need info on onan diesel generator

thats an interesting way to start an engine, is there supposed to be a heavy relay to switch the battery power to the exciter winding? sounds like the wiring on this could be complicated.

Mike
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Old 12-24-2006, 06:18:46 PM
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Talking Re: need info on onan diesel generator

Not familiar with the MDSP but I have a couple of MDJA's which i believe were
the prior model for yours. Typically there were two 12Vdc solenoids in the
control box. One for switching Battery+ to the Starter Winding and one for
Glowplugs. Onan used the same setup on a number of small Gasoline and
Diesel Gensets.

Bruce in alaska
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Old 12-26-2006, 09:22:19 AM
mikeinnh mikeinnh is offline
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Default Re: need info on onan diesel generator

thanks bruce for the info, not used to having no starter on an engine like this, Im going to try to find solinoids and see if i cant get some of tis wiring mess figured out. is there a generic wiring diagram for these or were they all different?
Mike
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Old 12-26-2006, 11:46:36 AM
Gunny Gunny is offline
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Default Re: need info on onan diesel generator

Mike:
Post the whole model/spec and serial number and I'll see if I can find a wiring diagram on this end. Those are some relatively simple machines.

Gunny
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Old 12-26-2006, 03:58:17 PM
mikeinnh mikeinnh is offline
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Default Re: need info on onan diesel generator

Hey gunny, the model number is 3MDSP-1R/1A and the serial number is 46B539770. thanks for the help.
I tinkered with it today for awhile and found the glow plug is no good, i ohm it out and it shows open, so i think i will head down to the parts store and see if it will match up to anything that they have. it does have some numbers on it so I might get lucky. oh yeah I took some pics of the beast too.
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Old 12-26-2006, 08:09:43 PM
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Talking Re: need info on onan diesel generator

Cute, Looks like it has a VERY Simple Safety Shutdown System. See my Post
on the DJA Contractor's Model. I suspect that yours uses a very similar
system. You could plumb in a small Compact Car Radiator and make a Really
NICE, Stationary Genset. Wish I had that little Gem, I got some neighbors
who would KILL for something like that.

Bruce in alaska
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Old 12-26-2006, 10:25:42 PM
mikeinnh mikeinnh is offline
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Default Re: need info on onan diesel generator

its kind of a strange little beast, I hope I can get it to run. the cooling system is somewhat odd, the lines are tiny, i will have to figure out a small radiator set up and I think your right, it will be a cool little rig, Not sure how load it will be thou.

mike
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Old 12-30-2006, 02:19:47 PM
mikeinnh mikeinnh is offline
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Default Re: need info on onan diesel generator

Well, i put a new glow plug in the engine today, bled out the fuel system , seem to be alot of air trapped in it, cleaned the injector and adjusted it to the best spray pattern, and it fired rite off, didnt run too long but after i bled out the air some more, it caught and ran , its a loud son of a gun with no muffler and firing rite outta the head, puts out quite a smoke show too when its first started, and to my surprise it even put out power once it came up to speed, althou its a bit high, i think it was at about 150v a/c, mite need to turn the govoner spring down a bit. not bad for sitting for years unused.
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