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Onan - Unknown Generator. Help needed


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  #1  
Old 09-19-2018, 06:40:45 PM
Steve Bracken Steve Bracken is offline
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Default Onan - Unknown Generator. Help needed

Hi Guys ... This is my first post.

Yesterday an Onan followed me home. I've heard they do that!

For some time I have been looking for a fun project to get stuck into, and my aim here is to see if this will come back to some sort of running order. I threw $50 at the very nice owner to get it in the back of the truck, and now it's in the shop.

All I know about it is that the engine was locked, it came out of a 1970 RV, and that the original owner thought that it was making electrons last time it ran. Last time it ran was a long time ago.

The pictures are immediately after I took it off the truck and onto my motorcycle lift.

The engine was locked, but it freed up very easily with a little ATF in the cylinders and gentle rocking of the crank nut .... there is no compression but I suspect that is because the valves are stuck too ... time will tell.

So ... what is it?

The cylinder cover that should have the data plate is missing. There may be other missing parts too but it looks fairly complete.

Thanks in advance.









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Old 09-19-2018, 06:42:07 PM
Steve Bracken Steve Bracken is offline
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Default Re: Onan - Unknown Generator. Help needed

More pics:









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Old 09-19-2018, 06:53:25 PM
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Default Re: Onan - Unknown Generator. Help needed

Somewhere on the engine block will be a stamped number. Find that, and much will be revealed. Number may be hard to find, but there will be one....

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Old 09-19-2018, 06:54:29 PM
YellowLister YellowLister is offline
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Default Re: Onan - Unknown Generator. Help needed

That is the cast iron block cck.. most likely a 4 kw.. later than 1970 with the square un generator end.. missing the electric fuel pump too.. and the start solenoid.. these are excited cranked so the generator end is the starter

Looks like it had a sisson choke exhaust manifold that has been replaced with 2 pepper box mufflers.. will sound like a Harley at idle..
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Old 09-19-2018, 07:02:09 PM
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Default Re: Onan - Unknown Generator. Help needed

I second on it being a 4.0 CCK. The narrow stator tells me it's a 4kw. It has the late control box but you are missing a bunch of stuff for it.
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Old 09-19-2018, 07:30:46 PM
Steve Bracken Steve Bracken is offline
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Default Re: Onan - Unknown Generator. Help needed

Quote:
Originally Posted by Motorhead View Post
I second on it being a 4.0 CCK. The narrow stator tells me it's a 4kw. It has the late control box but you are missing a bunch of stuff for it.
Can you give me an idea of what is missing?

---------- Post added at 06:23:00 PM ---------- Previous post was at 06:08:09 PM ----------

Does ... 505430 ... sound like a serial number? That number is stamped on the top of the block

---------- Post added at 06:24:18 PM ---------- Previous post was at 06:23:00 PM ----------

Does ... 505430 ... sound like a serial number? That number is stamped on the top of the block.

---------- Post added at 06:30:46 PM ---------- Previous post was at 06:24:18 PM ----------

So the entire number is:

19 followed by a small circle above 505430
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Old 09-19-2018, 07:32:38 PM
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Default Re: Onan - Unknown Generator. Help needed

The six numbers will be under the air hose. About where it bends.
Head cover
Fuel pump
Start solenoid
Choke.
Point box cover
Button plug
All items that can be found. Does need cleaning up and some repairs. Will be a good project. But when you get it running you will find it is better than anything in its class. That you can buy today.

505430 is it. Give us time to get all the information.
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Old 09-19-2018, 07:58:20 PM
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Exclamation Re: Onan - Unknown Generator. Help needed

The fact that there are so many missing parts, and the fact that the engine is seized, if it were me, I'd find another one like it (at least one with an engine that turns over) and use this one for parts.
If this has been sitting outdoors, uncovered, with those mufflers, the engine is scrap.
This is NOT the "fun" project you're looking for.
There are plenty of other, much nicer Onans out there. You just have to find 'em.
(Hint - They're hiding in old RVs)

And welcome to the group!
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Old 09-19-2018, 08:24:06 PM
Steve Bracken Steve Bracken is offline
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Default Re: Onan - Unknown Generator. Help needed

Thanks.

I'm going to stick with this one at least up to the point where I have to spend money.

Engine freed up in about 30 seconds with a little gentle persuasion, and the missing bits don't appear to be horribly expensive. If I remove a head and there is significant wear, or scoring to the bore it might be a different story.

Mostly, so far, it seems to be labor and a few service items, and my labor is free.

I'll keep an open mind though.
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Old 09-19-2018, 08:46:10 PM
mudduck56 mudduck56 is offline
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Default Re: Onan - Unknown Generator. Help needed

Warning Will Rogers. You have contracted the GREEN Disease!!!!
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