Carb

I have a Farmall 460 that tends to foul plugs. I have adjusted the screw on the lower portion of the carburetor / leaned the carburetor several times, but have had mixed results. It seems to run fine with a new set of plugs for 2-3 hours and then it starts acting up. I also have trouble with the carburetor frosting over during the cooler months of the year. Any ideas or suggestions would be greatly appreciated.

If it is running well, and not using massive oil, (and you are happy with the work it is doing) put a set of hotter plugs in it. Equivalent to Champion D21 is about as hot as available. Plugs that work, Of whatever brand, are good. I have no USA brand preference. Leaning the carb even more may be needed.
If you make it work, it will likely stay cleaner.
If it has fuel in it that is older than a month, it may get much better if new fuel is used. JimN

I recently had a similar problem with my 666. After a lot of messing around, I found that the condenser had messed up my points so I filed the points down, replaced the condenser and set the gap. The tractor now works like a beast again and the plugs aren't fouling any more.

Well , first off is it plum wore out and are you having a issue with oil fouling ??? or is it fuel . Just who's plugs ya running . On setting the carb the first thing ya have to know is the carb. in good shape and is the float level set correctly . IF so then the main jet should be set 4-5 turns off the seat and left alone as one thing that dig into your wallet is a leaned out engine . Next is the engine timing set correctly ??? timing is set at full rated PTO RPM . The next thing to look at is the fuel that your trying to use . Are you running the cheapest gas ya can find ???: If so that is not going to cut it , you can get away with this on and old h-m-300-400 but not on a newer 4cylinder or 6 cylinder . First off you have no idea on how many times that engine had had the head milled down over the years to clean it up as back when they brought them engines out they had exhaust valve probelems wright off the start . They figured it out and this is why they brought out the LOW ASH oil for the gassers . And also the gas back then was not the gas of today . IF my memory serves on a 460-560 the minimum octane requirement is like 89-90 . In my area there are still a ton of old farmall gassers working everyday on dairy farms and i have been thru this over and over again . Ya want a old farmall gasser to run the way it is suppose to run then ya start off by a good MAJOR tune up setting the carb the way it is suppose to be set set the timing at what it is suppose to be set at with no more then +2 degrees set the valves dead on there propper set and here ya have to make sure that due to ware ya don't have what i call bridgeing between the valve stem and the rocker due to ware . Next ya run no oil other then Low Ash Run the minimum on octane on the gas but for best results set up to the good stuff . Myself i have run farmall gas tractors for thirty eight years and i think i have run into every quark that they could ever have . All of my closest friends all have Farmall gassers and every one of them is still doing what they were meant to do . On the spark plug issue throw away the champions and either go with a A/C in a C86 or the Auto lite or Motor craft and for some reason i forgot the Number this morning (CRS). If ya have to run a hot plug then your way past time for a rebuild.

This is the first mention I have seen on this forum of Low Ash engine oil. It really helped us out of a bind with the plug fouling and valve problems, especially in the 706. Not all low ash oil is the same, the Viscosity Oil co really did a good job of formulating oil for IH . We some times don't give much thought to what additives are put into the base oil and when it burns it naturally leaves (ashes) behind. They got rid of calcium, barium and magnesium in their low ash oil for gasoline engines.

You might try adjusting your float level very slightly - in the direction to very slightly lower the fuel level in the carb bowl.
mike

Thanks for each of your suggestions. I will have several things to try as a remedy. FYI: I have been running Havoline 10-30 and using Champion 18's. Thanks again--Great forum.