What about just fabbing one up yourself? You've got the existing pan, so it's straightforward to make the mounting surface by using it as a pattern.

 

You will likely need to change the number of balls in the gov, the generator was probably 1800 rpm, and you'll want 3600 for the tractor. (IIRC, 5 for 3600, 10 for 1800, but check this)
Also, what will you do about the crank shaft? The gen likely has a tapered shaft, and you'll need a straight shaft for the tractor. Years ago I turned the shaft from a gen to make an adapter to convert to straight shaft so that could be an option.

Oh, and maybe the carb will need attention, again the 1800 to 3600 thing.

 

The drive shaft bolts to the flywheel. I already checked the holes, they line up. The engine output shaft is just the front pto, which I wont use. It had an electronic governor. I bought a camshaft with a governor and the linkages I need. Hopefully I can pull the governor stuff off and swap it to the cam that's already in it. I figured the carb was just limited by the little cap that was on the bottom, so I took care of that with a flat head. I wont know what kind of adjustment I have until I get it running, but it's not hard to drill jets. It just takes some time.

On the pan, I thought about making one or modifying the current one, but I have never welded aluminum, or magnesium, or any alloy there of. At the price of aluminum, I wont have much room for error.

 

why does it have to be aluminum? There are plenty of automobile oil pans made of 18-14 gauge steel...

 

They dont support the weight of the engine though. I trust 1/4" thick aluminum more than 18 gauge steel not to flex under the weight of a 60+ lb engine. My thought was to saw the sides off the pan to the width I need, weld on side plates and ears to hold it down, then have the top machined to make the sealing surface flat. I could have a machine shop do it, but then why not just pay $75 for a pan that's made to fit?

 

Or use thicker steel for the parts of the pan supporting the engine?

 

So you won't be running a clutch off the output end to drive an attachment? Ok.
You might want to check with one of the guys selling Onan parts, I can see different cams in the 2 different engines.
What year is this motor?

 

The transmission, deck, and rear pto are driven off the gear box. That's driven by the driveshaft from the flywheel. I have a tiller and cultivator attachment, but nothing driven off the front. The block has a date code 1999 Rev.F. I know some Ck, P, and B series parts will fit. I don't know if they ever used the 60 c.i. engine on anything other than generators.

 

Yes, the NH series was used on many things, not just the generators.
I also don't think much from the CCK and B/P series will fit, other then very generic stuff, like points, gov balls, etc.

The NH (A,B,C), T260 and P224 are all the same basic engine, ie, the 60 ci, just different vintages.
I don't remember the 60 getting as much design attention as the 43/48 engine.

With this said, I was/am a diesel guy and didn't spend much time on the gas engines.

 

I found a P218 pan that's 3 3/8". Do you know if it will fit an NH? Is there a resident onan guy I should talk to?

 

I don't know if the pan will fit, but if I had to guess, I would think not.

IIRC - there are a couple guys who sell Onan parts, I don't know their names, do a search of this site and you will likely find them.

BTW, they usually called "bases", not pans. The diesel I worked on had "pans", made of sheet steel, the gas engines, to my knowledge, have always used "pans, made of cast alum and they have mounting lugs.

 

@boomers_influence and www.onanparts.com

I have an extra base from an N52M - dunno if the bolt pattern is the same - i can measure it and if it is, and it will be useful for you, you can have it for the cost of shipping.

 

not very pretty, but here are the dimensions.