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Ingersoll 448 Surging

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#1 jaybo518 OFFLINE  

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Posted June 19, 2014 - 10:42 PM

Hello all,


I am new to the forum and I tried some searches and cannot come up with the information I need.

I have a 448, serial number 14114664, with the "Nikki 146-0414" carb.  I am having the dreaded surging which goes away under load and by using the choke at idle.  My father and I are in the process of troubleshooting and are looking for recommendations as to the best course of action.  Should we pull the intake manifold and the carb off and rebuild, or is it better to find another carb?  Also where is the best place to obtain gaskets for both intake and carb? Any suggestions or recommendations are greatly appreciated.  We love the tractor and don't want to damage the engine by running it too lean.





#2 Rock farmer OFFLINE  

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Posted June 20, 2014 - 05:10 AM

Hello Jason!
And welcome to Gttalk!
The first thing you want to do with that Onan,
Is clean the externals of the engine real good.
Used compressed air.
Then remove what you need to get at the carburetor.
Get yourself a couple of cans of carb cleaner.
Remove just the top half of the carb. And clean it real good.
You will probably see grit settled down in the bowl.
You will need to wick that out with paper towels.
Usually you will not need a gasket set to do this.
Re-assemble and give it a try.
That will probably fix your problem!
If it does not, then you'll have to get more into it.


#3 crittersf1 OFFLINE  


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Posted June 20, 2014 - 05:41 AM

:welcometogttalk: :wewantpics:

#4 KennyP OFFLINE  



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Posted June 20, 2014 - 06:47 AM

I was able to pull a carb off the P220 (nearly identical to the B48G or M engines) without taking the intake off. But, you may want to check the intake seams for leaks as that is a known issue on Onan's.

#5 superaben OFFLINE  

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Posted June 20, 2014 - 06:13 PM

Kenny solved the problem. 


If it surges, the intake manifold is leaking like a sieve.  It actually splits in half once the carburetor is removed.  Use a good bead of high heat silicone around the border and any surging will be fixed.


Ben W.

#6 jaybo518 OFFLINE  

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Posted July 03, 2014 - 09:32 PM

Thanks everyone.  I have to tear it apart and see if these solutions solve the problem.