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Hey Onan Gurus

J

Jeff NWOH

Member
Plucked this 20 HP vertical shaft Onan out of the scrapyard the other day. I can't say I've ever seen one before. Just wondering how much of this is the same as a horizontal engine. Same block? I assume most internals would be the same. No plans for it, but just curious.
a162339.jpg

a162340.jpg
 
If you have a horizontal donor and a friendly machinist, it can be converted. I had the crank shortened as it has two lower main bearings. cut to right length, turned to the OD I needed and rekeyed. Replace the oil sump, tap and plug two holes used for oil drain back, use the horizontal manifolds and carb and some other minor things.

Mine came from an MTD of all things! Never knew them to use top quality when those were built.
 
I usually don't buy vert shaft engines because there are tons of them all the time. I figure I wont have to wait long if I need one. I know Onan parts are very spendy, so I figured it would be worth putting in stock for parts.
 
The cost and crappy service life of the Onan ignition parts in the B48-G engine in my 982 Cub Cadet is enough to prevent me from ever picking up another Onan engine. Parts are WAY over priced, don't last, I can't understand how so many welder generators got Onan engines with the terrible governor design they have. As the engine gets warmer the plastic finger wheel slips on the cam gear and engine RPM soars or the engine slowly looses rpm but the governor won't increase throttle opening to gain back speed, increase throttle and it over speeds. With the brittle weak conn rods you don't want engine running too fast. Guy on another forum that was a mechanic at a big welding supply shop had a Huge MOUNTAIN of blown up Onans.
 
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