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Carb trouble

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Wes

03-25-2003 18:44:01




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On my 47 model A if I leave the fuel on it will flood the cylinders and run out the manifold. It will even do this if running at an idle. How do I adjust the float to stop this?




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Clooney

03-26-2003 03:20:37




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 Re: Carb trouble in reply to Wes, 03-25-2003 18:44:01  
Wes, it could be a defective or stuck float, but could also be other things like porosity in the bowl casting or plugged bowl vent. [over the years I have seen a few rust through in the bottom of the cast well around the seat thread area]
~Probably the best approach is to either lower or completely remove the float bowl, then use a cork & plug the lower bowl nut hole, then hook a fuel or other liquid supply to the inlet fitting & watch the bowl for signs of overflowing. Pay particular attention to the threads around the needle & seat & look closely at the casting around the needle & seat well for signs of seeping fuel through the casting. You might even want to remove the float & needle & use a small cork to plug off the seat opening. ~If you can�t find any blatant problem in the fuel bowl then look for a plugged bowl vent in the top of the bowl area in the main casting [very possibly plugged baffles].

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Walt

03-25-2003 20:09:36




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 Re: Carb trouble in reply to Wes, 03-25-2003 18:44:01  
I did a fast rebuild on my D I overlooked the float. I started the tractor and it ran ok for 10 minutes then it began to flood out, I took the carb off and removed the float when I shook I was able to hear gas slosh inside. I found the leak and used J B weld to fix it.



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David

03-25-2003 19:46:53




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 Re: Carb trouble in reply to Wes, 03-25-2003 18:44:01  
Wow! I have the same problem on my 37B. Cylinders flood and I can't ever get started. Needle valve problem sounds like the culprit. Thanks for the advice John and paul and good luck Wes with geting it fixed.



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John T

03-25-2003 19:10:45




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 Re: Carb trouble in reply to Wes, 03-25-2003 18:44:01  
Wes, I generally adjust my float levels to where they shut off the flow when they are approximately level. However, your problem may not be the floats setting, but that the needle valve and seat are not actually stopping gas flow although the float "level" is set correctly. The needle valve and seat could need replaced or there could be dirt or a piece of rust or sediment embedded preventing proper shut off. You might want to try and drain and clean the carbs strainer or remove its top cover to clean the needle valve/seat area, but you will probably need a new top gasket so it seals back properly. Floats can spring a leak causing them to sink therefore never shutting off the gas also. Try and clean the needle valve/seat of any rust or debris and/or install a new seat and needle in the event the float itself is not leaking and is set to level but gas still seeps past. If I recall, theres also a gasket under where the brass seat assembly screws down into the carb at the strainers bottom. Regardless, I always shut my gas off just to be safe.

Good luck n God Bless America

Ol John T Nordhoff in Indiana

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Paul from MI

03-25-2003 19:09:39




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 Re: Carb trouble in reply to Wes, 03-25-2003 18:44:01  
Wes,
Your problem most likely isn't float adjustment. I would look for a bad needle & seat or dirt in the needle & seat, also make sure the float moves freely.. If that's OK, you probably have a bad float. These are pretty common, I have replaced several on my tractors over the years. Doug Burrey has anything you'll need, or if he'll do a complete rebuild if need. He just replaced a broken stem on my B and did a great job. Good Luck,
Paul

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rob

03-31-2003 05:46:22




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 Re: Re: Carb trouble in reply to Paul from MI, 03-25-2003 19:09:39  
You might want to try Roberts Carb Repair if your going to be replaceing or rebuilding that carb? Good stock and real good about giving out advice on these old machines of our's I've found.



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