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Tractor Talk Discussion Forum

j.d. 4010 gas overloading engine

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Dave Sintich

11-26-2003 20:46:54




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I have a 4010 gas that when it's warm the engine overloads and the carb starts to choke out. The engine is set to specs and the carb has been cleaned and new gaskets installed but still the problem exists. There are no cracks in the manifold and the compresson is good. Any suggestions?




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Heat Houser

11-27-2003 17:57:03




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 Re: j.d. 4010 gas overloading engine in reply to Dave Sintich, 11-26-2003 20:46:54  
Do you have the Marvel-Schiebler carb or the Zienth? I have a Marvel and it is made from aluminium and is kind of squarish looking. I had the same problem with it loading up and finally found a hole in the diaphram that gives an extra squirt of fuel when jerking open the throttle. To test, take a stubby screwdriver and remove the rear cover. The diaphram is on the inside of the rear cover underneath another cover that is maybe one inch by an inch and a half. Cut some strips of pop or beer can and use it between the gasket and the outside rear cover to plug both the top and bottom passage ways (drillings)that lead from the diaphram assembly. This should block any gas from being sucked through the diaphram. Your tractor may stutter a bit when jerking open the throttle but should not load up when warm.
If you are running your manifold heat block to preheat the fuel air mixture, you may expierience fuel ignition in the intake manifold if you are under a steady load for a long time and after the manifold gets a dull red hot. I run in the heat position since it gives a better fuel to air mixture but when I grind feed and push it a bit, the tractor starts to backfire through the carb. The backfire tends to bend my choke wire and really loads it up with gas.

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Dave

11-30-2003 20:12:26




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 Re: Re: j.d. 4010 gas overloading engine in reply to Heat Houser, 11-27-2003 17:57:03  
The plugs do carbon up fairly quick and I also have replaced my share of choke cables. I bought a rebuild kit for the carb so I'll see if that helps. The engine shows no sign of friction by this I mean there isn't any metal in the oil and the cylinders look good and smooth. I'm going to replace the carb seats and mixture screws and check the float setting and the kit comes with the new diaphram and seals. If that doesn't help I'll still be at square ONE!!! Thanks for the help guys...

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RAB

11-27-2003 08:24:38




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 Re: j.d. 4010 gas overloading engine in reply to Dave Sintich, 11-26-2003 20:46:54  
If its running rich, the carb is probably at fault. I am assuming from your post that the engine is going too rich as it warms up. Have you looked at plugs for colour of fouling? Does it need any choke at cold start-up? Hope the engine is not overloading as it is probably only driving itself and that would therefore indicate a lot of friction somewhere in the engine.
Look at float height and leakage through the float valve.
Regards, RAB

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