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Mystery Onan?


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#1 Texas Deere and Horse OFFLINE  

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Posted October 15, 2012 - 08:38 PM

I got a mystery Onan with a JD 318 that we picked up last week. How can I tell what model it is when there is no ID tag? I don't think it has many hours on it and it runs great.

Here are a few pictures,
2012-10-15_18-52-15_674.jpg 2012-10-15_18-52-42_659.jpg 2012-10-15_18-51-49_429.jpg 2012-10-15_18-51-58_974.jpg 2012-10-15_18-52-09_766.jpg

#2 jms180 ONLINE  

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Posted October 16, 2012 - 05:18 AM

Looking at your picture #3 I see no point box so it maybe a P218 or P220. The B43 & B48 had auto type coil with points and the P series had electronic module mounted below crankshaft with different type coil.

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Edited by jms180, October 16, 2012 - 06:35 AM.

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#3 olcowhand ONLINE  

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Posted October 16, 2012 - 08:09 AM

Looking at your picture #3 I see no point box so it maybe a P218 or P220. The B43 & B48 had auto type coil with points and the P series had electronic module mounted below crankshaft with different type coil.


I'm with jms on this one. I believe the P218 & 220 have the same bore & stroke, but with different carbs & different grind on the camshaft. So the carb #'s may tell which it is for sure. Camshafts usually have the same casting #, so that wouldn't differentiate the two models.
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#4 jms180 ONLINE  

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Posted October 16, 2012 - 08:26 AM

I agree with you Daniel. That is a strange color most where painted black or primed gray. John Deere engines had larger crankshaft on pully end.

#5 olcowhand ONLINE  

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Posted October 16, 2012 - 08:31 AM

John Deere engines had larger crankshaft on pully end.


Yes, I forget the diameter, but I'm thinking 1 3/8, maybe 1 7/16". I have a couple of them, so I'll check to be sure just to refresh my mind.

#6 KennyP ONLINE  

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Posted October 16, 2012 - 08:58 AM

My B43/48? has the 1-7/16 shaft end. I was wondering which model this was!

#7 Texas Deere and Horse OFFLINE  

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Posted October 16, 2012 - 10:34 AM

It has no points or coil. The crankshaft is a smaller DIA. then the Deere engine, but I haven't measured it yet.

#8 Texas Deere and Horse OFFLINE  

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Posted October 16, 2012 - 10:59 AM

Just checked the shaft on the "P" motor and it is 1.125". Now I need to measure the crank in the 318 and see what size bushing I need to make this work

The B43 crankshaft measures 1.143", I need to fide a steel bushing to go from 1 1/8" to 1 7/16" and cut a key way thru it. I will also have to machine a special key for it.

#9 jms180 ONLINE  

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Posted October 16, 2012 - 11:59 AM

You have a good strong engine when you get the pulley fixed.




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