Re: JD 4010 plug fouling

Posted by Jon Hagen on December 06, 2002 at 21:31:13 from (63.160.194.139):

In Reply to: JD 4010 plug fouling posted by Richard Heyduk on December 06, 2002 at 18:47:26:

Have used the antifoulers on somthing with oil getting into the cylinder from worn rings or valve guides. They work fairly well for oil fouling,but don't know if they will help for gas fouling.
I have a 4020 gas that was terrible for plug fouling untill I added an electronic ignition conversion with a hot coil. The hot ignition cured the hard starting and plug fouling but agerivated another problem those old JD/Delco distributors had. That screw on distributor cap with the plastic cover over the points is a near air tight fit on the distributor and It always ran rough after a few minutes of running that I finally traced down to a build up of very conductive ozone gas in the distributor. The tractor always had this condition and it became much worse with the hot ignition which caused more arcing between the rotor and cap contacts thus more ozone generated. Was working the tractor on a hot still day last summer,and the roughness was getting so bad that I was afraid of damaging the engine. I stopped and removed the distributor cap to check for cracks,found none and put it back together, The tractor ran great for 5 minutes then back to the roughness. This got me thinking about how most of the newer engines with their high output ignition systems have a vent hole in the cap to vent ozone. I drove home and drilled an 1/8 inch hole in the cap near the bottom. This totally cured the problem, the tractor runs smoother than it ever has in it's life,reminds me of an old 88 Oliver now. I was able to lean out the main carb jet for better fuel econony and have a smooth torquy engine now. fixed somthing the JD engineers missed from day 1 fourty years ago :)

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