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onan b48m DD carb troubles


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#16 ssmewing ONLINE  

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Posted June 28, 2017 - 05:14 PM

If you would have gotten the right kit the float would have came with an assist spring.

Do some more shopping or Google assist spring for the carb float.

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#17 KennyP ONLINE  

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Posted June 28, 2017 - 05:24 PM

Bought mine from an Onan Parts dealer!



#18 ssmewing ONLINE  

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Posted June 28, 2017 - 05:31 PM

I went through this myself. I was using another forum and found the thread where I worked through the problem. The one poster called Boomer is an Onan specialist and parts seller. Any Onan part you get from him is 100% correct. I am sorry that I did not remember the assist spring thing earlier. I have actual memory issues. It takes awhile sometimes for it to come back to me. But, I am 100% certain that it is the solution to your problem.

 

The linking to the thread won't work. This forum won't link to another. If you go to case colt ingersoll .com without the spaces and search for B43M DD13 carb issues with the author ssmewing, that is the thread.


Edited by ssmewing, June 28, 2017 - 05:33 PM.

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#19 KennyP ONLINE  

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Posted June 28, 2017 - 05:41 PM

Then I guess the brass float is not a replacement item as it needs another part for it to work right. Think I'll dig out my old float!



#20 ssmewing ONLINE  

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Posted June 28, 2017 - 05:57 PM

My post above was edited. Sorry, but the correct Onan float would come with an assist spring. The assist spring will fix your issue.

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#21 KennyP ONLINE  

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Posted June 28, 2017 - 05:59 PM

I won't buy another float just to get that spring! And I have never seen any thing that shows that spring with it!



#22 ssmewing ONLINE  

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Posted June 28, 2017 - 06:12 PM

I can't tell you how to fix it then. Sorry.

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#23 gopher OFFLINE  

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Posted June 28, 2017 - 06:35 PM

Go to Onan parts .com part number 146-0379. $4.50 for spring has two in stock. Not sure on shipping rate any way you have part number to look around.


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#24 dropped82 OFFLINE  

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Posted June 28, 2017 - 07:29 PM

I won't buy another float just to get that spring! And I have never seen any thing that shows that spring with it!

I just went through my container of DD and did not find one assist spring. I'm sure it exists but must've been an update. I've got 2 Onans without this spring that run excellent. The top of the carb is fairly simple to open up. I'd remove it and adjust the float a little bit and see what happens. It could be as simple as the adjustment that is causing the headache.

Eric

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#25 Beardo OFFLINE  

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Posted June 28, 2017 - 10:56 PM

Yeah I got the assist spring coming in the mail. Hope to get it in this weekend

#26 toppop52 OFFLINE  

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Posted June 29, 2017 - 09:09 AM

My b48 didn't have a spring either, on a couple of mine I've had set the float lower than spec to stop flooding.

#27 ssmewing ONLINE  

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Posted June 29, 2017 - 11:14 AM

This is what is happening. The Onan made float comes with the spring as it is obviously needed. The aftermarket only sells the float which is heavier than the fiber float. But, the fiber float and the heavy brass float have the same area to occupy. This problem has been known from the time the fiber float was discovered to disintegrate in modern fuel. It pays to buy Onan made parts on almost all the parts.

 

What until you try to get that spring on there. It takes patients and fingers the size of tweezers.

 

There is a very slight difference in gaskets for the carb tops as well as I had to learn. There is one gasket made for a carb with just a round hole in the mating surface, and then there is one made for a carb with an oblong hole. It does matter.


Edited by ssmewing, June 29, 2017 - 11:15 AM.


#28 kencombs OFFLINE  

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Posted June 29, 2017 - 11:14 AM

IME, the assist spring is needed with a metal float as they are heavier than the foam.  But, the foam tends to swell and touch the carb body.  That said, setting the float a little lower than spec may get it working until the spring comes.  But, there is a risk to doing that, it may run lean under heavy load.  The source of Onan parts listed earlier, Boomer, is excellent as a source and tech info on all things Onan.



#29 toppop52 OFFLINE  

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Posted June 29, 2017 - 06:44 PM

I agree that Boomer is the man! He's helped me more than once.

#30 Beardo OFFLINE  

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Posted July 02, 2017 - 06:17 PM

Installed assist spring checked everything and still same problems. Took it back apart rechecked everything. Put it back together and still same thing. Where do I go now?




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