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Onan Help With Questions


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#1 BairleaFarm OFFLINE  

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Posted February 22, 2012 - 03:18 PM

Ive got this 20hp onan from the wheel horse. I hooked everything up. It wouldnt fire. Flames coming out of the carb and exhaust. I pulled the heads the the valves are not seating all the way on one side. What would be the best/next thing to do do fix this?

#2 olcowhand OFFLINE  

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Posted February 22, 2012 - 03:24 PM

David, you need to pull the intake, so you can pull off the valve covers. The lifters have adjustment bolts on them, so easy to adjust the valve clearance, once you get to them. The manual you downloaded will have the clearances.

#3 BairleaFarm OFFLINE  

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Posted February 22, 2012 - 05:51 PM

Got the motor apart. Found a few things.

1. Valves dont close all the way in one of the cylinders
2. Oil level was high and smelled like gas.
3. Keyway sheared on flywheel.

#4 Cvans ONLINE  

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Posted February 22, 2012 - 07:52 PM

Got the motor apart. Found a few things

You sure did. Any one of those things could have kept it from running. I'd say your trouble shooting skills are right up there.

#5 olcowhand OFFLINE  

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Posted February 22, 2012 - 08:24 PM

Well, that timing pickup ring sits on the rear of that key, so the timing was thrown way off! That is a special key also, so you'll have to go to a Toro or Onan dealer to get it, or order online. Onanparts.com has them, $5 each plus shipping. Remember you may need some gaskets also, especially if pulling the intake, as they rarely come off in reusable condition.
http://onanparts.com...products_id=105

#6 olcowhand OFFLINE  

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Posted February 22, 2012 - 08:29 PM

By the way David, when I torque a flywheel, I always use a pipe that will fit over the flywheel retaining bolt to impact the flywheel tighter. In other words, toque the bolt to spec, then use the pipe to impact the flywheel but not the bolt. Then re-torque again. Almost always the bolt will need re-torqued at least once if not twice doing this way. Also, I've never sheared a flywheel key since adopting this method. Don't use an 8lb sledge though! Just a 1lb hammer will do with a mild whack on the pipe.
  • KennyP said thank you

#7 BairleaFarm OFFLINE  

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Posted February 22, 2012 - 09:16 PM

Got her all somewhat put back together after adjusting the valves. Went to start it on the bench. Yeah, that was dumb. Hammer caught the flywheel. Broke fins off at 10 12 and 6 oclock. Sent shrapnel through the brand new battery and sprayed acid all over the play, But hey it ran like a scalded dog. Im happy.

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#8 olcowhand OFFLINE  

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Posted February 22, 2012 - 09:25 PM

If the fins were only broken off at 12 & 6 o'clock, it would be no problem with balance, but throwing in the 10 o'clock also, will throw it off balance some. How much depends on the weight of the pieces missing. I have welded them back on before with nickel rod.

#9 olcowhand OFFLINE  

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Posted February 22, 2012 - 09:26 PM

But to have this happen & still be happy.........priceless!

#10 NUTNDUN OFFLINE  

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Posted February 22, 2012 - 10:11 PM

Glad to hear you got it running but wow, that could have been bad. At least nobody got hurt and you are still happy. I would try and weld the pieces back in like Dan suggested. Might want to have it balanced if you can also.

#11 coldone OFFLINE  

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Posted February 22, 2012 - 11:30 PM

OUCH!!!!! Fins to the left of me Fins to the right! Fins in the middle of my battery tonight!

Glad you found the problems and got them fixed!

#12 Cvans ONLINE  

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Posted February 23, 2012 - 12:48 AM

I'm Happy for your I think :confuse:

It's good to hear that you got it running and nothing disastrous happened.

#13 KennyP OFFLINE  

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Posted February 23, 2012 - 08:39 AM

Sorry to hear of the breakage, but glad it runs. If you do have it welded, I think balance would not be an option. IMO

#14 achomesteader OFFLINE  

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Posted February 23, 2012 - 09:26 AM

But to have this happen & still be happy.........priceless!


:iagree:




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