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Now It Won't Run


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#1 SearsYellow OFFLINE  

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Posted March 23, 2013 - 08:02 AM

I cleaned the carb out on my Onan 19.9 Hp last night (it was running horrible) and after I got done it would not start. Well I figured out what the problem was. I installed the float upside down. I reinstalled the float and now it's getting WAY WAY to much gas. I believe I may have bent the needle tab whenever I installed it upside down. Now I believe the float is hitting the top of the carb and does not interrupt the flow of gas going into the carb. 

 

 

If y'all can think of anything else I could screwed up please chime in. Im not familiar with these motors and I may have missed something.

 

Thanks y'all!



#2 KennyP ONLINE  

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Posted March 23, 2013 - 08:11 AM

Which float does it have, brass or otherwise? Did you shake it to make sure it didn't have anything inside? I'm not sure which carb these have.



#3 MH81 ONLINE  

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Posted March 23, 2013 - 08:14 AM

Gumby, I think the Onan manuals here go over float settings.

#4 JRJ OFFLINE  

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Posted March 23, 2013 - 08:51 AM

If you have the brass float you need to check it to make sure is isn't filled with gas cause from a hole in the float. If it is the styrafoam like one you should be o.k.

 

 

Dick



#5 HDWildBill OFFLINE  

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Posted March 23, 2013 - 09:06 AM

Make sure the float isn't stuck too.  



#6 SearsYellow OFFLINE  

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Posted March 23, 2013 - 09:27 AM

I made sure the float didn't have a hole in it when I took it off the first time. I stuck it up next to my ear and shook it and listened for gas sloshing. The float sticking is a good idea I didn't think of.

#7 HDWildBill OFFLINE  

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Posted March 23, 2013 - 11:21 AM

When I check a float I will put it in a coffee can of gas or mineral spirit's and let it sit there for at least a day.  I learned a lesson a while back I used to let it just sit there in the can for maybe an hour or so,  I did this with one float off a Tecumseh and then put it back together.  It ran fine so I put it away and about a couple of weeks later I tried to crank it and had fuel running out the carburetor.  The float was bad it just took it a while to show up. 



#8 SearsYellow OFFLINE  

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Posted March 23, 2013 - 06:54 PM

I'm at a loss with this. I cleaned the carb 4 times. I changed spark plug. Made sure it was getting fire. Changed air filter. Changed gas line and filter fuel pump is loading the carb with gas. I still can't get the #*%@$* tractor to start. It's something simple but its absolutely got the best of me!

#9 HDWildBill OFFLINE  

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Posted March 23, 2013 - 10:19 PM

What happens when you shoot some carb cleaner down the throat of the carb and try to crank it.  If it cranks briefly and then dies that means you are not getting gas thru the carb.  Since you were getting to much before then I would say you have done something with the carb to prevent the gas from getting through.  Have you been playing with the tab on the float?  If so then you probably do not have it adjusted correctly.



#10 SearsYellow OFFLINE  

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Posted March 23, 2013 - 11:36 PM

I'm getting plenty of gas if anything to much. I took the carb off the engine to clean it so the carb cleaner left inside the carb was minimal. Yes I had to tweak the tab on the float if not no gas could get it inside the carb. I tried looking for the manual on here is ss18 and that's for a different carb than mine.

#11 KennyP ONLINE  

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Posted March 24, 2013 - 05:14 AM

 Is this the N52M Onan? Maybe we can dig something up on the carb.

 

Found the parts manual. Is this the carb?

Onan N52M Carb.jpeg

 

I'll see if I can find anything else for these.

 

 

EDIT: Found and uploaded a Service Manual for the N52M Onans;


Edited by KennyP, March 24, 2013 - 05:24 AM.

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#12 SearsYellow OFFLINE  

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Posted March 24, 2013 - 09:02 AM

Model B48G-GAO19 9/3713B


Serial- J793 488775

#13 HDWildBill OFFLINE  

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Posted March 24, 2013 - 11:19 AM

Here is the service manual for the B48G


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#14 TAHOE ONLINE  

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Posted March 24, 2013 - 01:31 PM

Hope you get it figured out.

I'm glad I'm not the only one having carb problems. I rebuilt a carb off a 13Hp Honda and also a buddy's 14Hp Kawasaki, I can get either of them to run right. Stupid Japanese carbs!!!



#15 SearsYellow OFFLINE  

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Posted March 25, 2013 - 11:18 AM

I went outside today and turned the key over and it started so beautifully. I thought it was a fluke so I let it run for 5 then 10 then 15 and it ran for 30 minutes before I cut it off. After cutting it off I turned it over and started within a 1/4 turn of the flywheel. Not sure what happened between Saturday and today but something happened. I guess the Onan fairy paid it a visit.


Edited by Gumby, March 25, 2013 - 05:24 PM.

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