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JD H Carburetor DLTX 46 Problem???

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Tom R

01-16-2000 19:50:47




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Having trouble starting my 1940 H. Since I bought it a couple of months ago I have had to start the the tractor by taking off the air filter connection to the carb, setting the choke at half open, hold my hand over the carb opening, then turning the flywheel to start the engine. Worked and the tractor ran great. I decided that it was the carb that needed work because of this and in additon it would often leak. I had the Carb cleaned and adjusted (no new parts) by a local experienced antique tractor buff. He has worked on it twice but new problems showed up. Not only won't the tractor start, gas "runs" out the choke/air filter side of the carb without trying to start the engine. I turn off the gas and the gas leak stops. Do I have a carburetor problem or is there possibly something else wrong? The person who worked on the carb tells me that there is not a float problem. Need your opinion on what the problem is most likely to be and the best approach to getting it fixed.

Thanks, Tom

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RonMC

01-17-2000 18:11:07




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 Re: JD H Carburetor DLTX 46 Problem??? in reply to Tom R, 01-16-2000 19:50:47  
Tom, is your choke closing completely ? Have a look to be sure the spring-loaded relief is actually in place. If you have a hole in the choke plate with nothing in it, you'll need a new plate. This may be why you don't seem to be getting sufficient choke action to start. The fuel leakage problem has to be related to wrong float level or leaking needle/seat, or sinking float.



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BARRY

01-17-2000 06:47:16




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 Re: JD H Carburetor DLTX 46 Problem??? in reply to Tom R, 01-16-2000 19:50:47  
YOU DEFINATLY HAVE A FLOAT AND OR A NEDDLE AND SEAT PROBLEM. I JUST FINISHED OVERHAULING MY "H" AND IT STARTS FIRST TRY EVERY TIME. THE KEY TO HAND START IS THE IGNITION, CARB,TIMING AND COMPRESSION MUST BE RIGHT ON. YOU MAY WANT TO CHECK OUT (ROBERTS CARB REPAIR) THAT SITE WAS VERY HELPFUL TO ME. MAKE SURE YOU DRILL THE CARB PASSAGES OUT. THIS SITE WILL SHOW YOU HOW.



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clooney

01-17-2000 06:20:20




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 Re: JD H Carburetor DLTX 46 Problem??? in reply to Tom R, 01-16-2000 19:50:47  
Tom, the first thing you should do is get that leak repaired. Take the float bowl off (the big nut on the bottom),then check the float level it should be 3/8" from the top of float to the machined surface of the carb.body (gasket surface),then remove the float(just pull the pivot pin),if its cork replace it,if its brass shake it to see if it has fuel in it. If it has fuel in it either replace it or solder the leak. (be careful) only use a solder gun (no open flames) or KBOOM. you will have to drill a hole in the float to let the fuel out. If you find nothing there replace the NEEDLE & SEAT assy. While you are in the carb. look at the choke plate to see if the little trap door is still in the choke plate(it covers a 1/4 X 3/8" hole in the choke plate & should have a spring on it to keep it closed.,if its missing obtain a new choke plate. Once you get it running right,run it for about an hour or two, to get the piston rings loosened & oiled up, then do a compression check on it. Compression should be 70-80lbs hot.--Let us know what you find.

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Tom R

01-17-2000 11:57:27




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 Re: Re: JD H Carburetor DLTX 46 Problem??? in reply to clooney , 01-17-2000 06:20:20  
Clooney, great advise and direction. I'll keep you posted.

Thanks, Tom



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MikeH(Tx)

01-17-2000 05:30:17




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 Re: JD H Carburetor DLTX 46 Problem??? in reply to Tom R, 01-16-2000 19:50:47  
You may have more than one problem, but it sounds like the carb float is one of them. No gas should be leaking out of the carb intake. Only the float bowl drain valve is designed to leak. :-)

I would suggest a compression check next. If you have to hold your hand over the intake to choke it, your valves might be leaking. Do you feel pressure or suction or both alternately when you do this. You should only feel suction.

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Tom R

01-17-2000 11:53:25




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 Re: Re: JD H Carburetor DLTX 46 Problem??? in reply to MikeH(Tx), 01-17-2000 05:30:17  
When I put my hand over the carb intake I felt what I thought was significant pressure.

Thanks, Tom



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MikeH(Tx)

01-17-2000 14:59:09




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 Re: Re: Re: JD H Carburetor DLTX 46 Problem??? in reply to Tom R, 01-17-2000 11:53:25  
You definitely need to do a compression check. I suspect you have a leaky intake valve as well as a carb float problem.



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Tom R

01-17-2000 16:23:36




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 Re: Re: Re: Re: JD H Carburetor DLTX 46 Problem??? in reply to MikeH(Tx), 01-17-2000 14:59:09  
Mike I told you pressure when I meant suction. I'm new at this and I'm not up to speed on the terminology and all. But I will plan on a compression check just the same. Thanks for taking time to help me.

Tom



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