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John Deere Tractors Discussion Forum
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'47 A Floods Before Starting?

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Allan Unger

09-11-2003 16:23:32




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My '47 A seems to have a direct path for gas to enter the cylinders. If I turn on the gas inlet valve for about 20 seconds, the shut it off, my A will start pretty normally. Then, if I turn the gas valve back on, it will run pretty good, but very rich. I have checked the float level and re-adjusted it to specs.

If I turn the gas inlet valve on and try to start the tractor, it will flood and copious amounts of gas smelling stuff will run out the petcocks.

I guess my next question is, can anyone reccomend someone to rebuild the carb (DXT13)?
Anyone have any suggestions to solve this problem.

Thanks, Allan

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Clooney

09-11-2003 17:40:54




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 Re: '47 A Floods Before Starting? in reply to Allan Unger, 09-11-2003 16:23:32  
Allan, you have a carb problem somewhere..... Problem is, It could be about anything....If the needle & seat are in good shape & the float is not sticking or leaking fuel into it's innards you probably either have a plugged bowl vent [common problem] or some casting porosity in the fuel strainer well above the needle & seat.
~I don't know how involved you want to get yourself but finding the problem isn't that hard.
~To start..pull the float bowl then plug the bottom hole with a cork, then run a fuel line or some type of fluid line to the bowl's inlet & place the liquid container above the float bowl. If the problem is in the needle & seat or inlet strainer well you will see the float bowl overflow. If the float bowl & needle & seat pass the above test suspect a plugged bowl vent or bowl vent baffles. That bowl vent passage & baffles are is a recess in the top of the carb casting inside the float bowl area & run back to the choke plate area.
~Post any questions, or E-Mail.. [email protected]

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Allan Unger

09-12-2003 16:42:59




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 Re: Re: '47 A Floods Before Starting? in reply to Clooney , 09-11-2003 17:40:54  
Still not perfect, but improved. Thanks Clooney, JDVan and John T for your suggestions. I have re-checked the float level and it is set at 1/2 inch. The float will shut off easily with just a hint of upward pressure. I did not use the cork plug method simply because I didn't have any suitable material to make an appropriate plug. The Bowl Vent is free, and the intake (thru the air cleaner) is free flowing (I checked air flow with my Industrial Size Shop Vacuum). I leaned out the load valve a bit. I will try and see if the float will shut off by itself after I scrounge an appropriate plug. The float and its needle valve are new. I guess that if the "plugging the bowl test" doesn't shed any new light on things, then Robert's Carburator gets some business. Thanks again for your help! Allan

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John T

09-13-2003 13:09:41




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 Re: Re: Re: '47 A Floods Before Starting? in reply to Allan Unger, 09-12-2003 16:42:59  
Youre sure welcome. John T



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JDVan

09-11-2003 17:06:39




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 Re: '47 A Floods Before Starting? in reply to Allan Unger, 09-11-2003 16:23:32  
It sounds to me like the needle and seat are not shutting down the gas flow properly. Is the float level set right. Does the needle and seat really shut off the gas when the bowl fills to the proper level? Is the choke working properly, ie opening all the way when the choke is off?

If you can't find the problem I would recommend only one carburetor repair facility. Roberts Carburetor Repair in Spencer, IA. See their web site below:

Link

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John T

09-11-2003 17:02:49




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 Re: '47 A Floods Before Starting? in reply to Allan Unger, 09-11-2003 16:23:32  
Hey there Allan, One thing that comes to mind is that even if the float level is set to where it "should" shut off the needle valve at the correct level, still if the needle valve and seat is leaky, it can overflow and flood gas. Another cause of flooding the carb bowl is a leaky float, yours didnt make any sloshing sound when shook like it had gas inside did it????? ? If it does, it will sink to the bowls bottom and flood the bowl.

If you had the gas turned on and the bowl removed, if you gently lift the float to where it should shut off the gas into the bowl, does gas still run ????? ?? It should stop when theres light upward pressure on the needle into the seat if its working properly.

There could be dirt or rust inside the needle valve/seat assembly preventing it from closing off the gas. If so:

You migth first try to remove the carbs side inlet strainer plug and drain and flush it out and use carb cleaner to possibly clean out the needle and seat.

Also, if needed, you could remove the strainers top nut and cap (may need a new gasket) and clean out the strainer and get carb cleaner down into the needle valve/seat and see if she will work then.

You might also (if still needed) remove the bowl and float and drop the needle out of the seat and clean and inspect things. Dont loose that lil bottom spring that goes up against the brass center nozzle if you remove the bowl. The brass center vertical nozzle needs to be held up into the carbs bore which the spring or later corrosion holds up anyway.

You first have to determine whether or not the float is at the right level and THEN if the needle valve and seat shuts the gas off from further entry into the bowl as it should. If the float is not leaky and the needle valve and seat shuts gas off at the right level, remove the air inlet pipe and see if the choke butterfly plate is closing and opening and STAYING OPEN in relation to where the choke rod is set????? A loose butterfly plate or non working choke to rod assembly may allow the choke to stay too closed floodign thigns out.

Also inspect the air cleaners bottom bowl to see if its clear and the rest of the air inlet system to the carb to see if its clear. If she cant get air in, she wil run too rich and flood out. Does it help if you adjust the load needle in leaner????? ????

Theres more that could be a problem, but this should be enough to get you started. If you have any questions, you can call me at (812) 824-4608,,,,, ,, or e mail me at [email protected],,,,, , or post back.

Good Luck to you and God Bless

John T Nordhoff in Indiana

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