David G, When younger a friend had a small airplane. At higher altitudes, the air is less dense and engine would run rich. To adjust the carb, he pulled on a lever which made the mix go lean. He used an exhaust temp gauge to get the mix perfect. As you lean the carb out, the exhaust temp will increase to a point. After you get to max temp and you continue to lean carb, the exhaust will decrease.
In the early 70 Chrystler experimented with a lean burn engine, before fuel injuection and the modern computers. So going too lean will actually cool engine. Chrysler also played with varing the timing to compensate for engine pinning and engine temps.
After I couldn't get leaded 98 octane for my 62 XKE, I had to retard the spark.
I recently purchased an exhaust temp gauge, $22 off ebay and installed it on my Jubilee. I cranked the main jet in 2 1/2 turns from winter setting to get max exhaust temp. Another 1/8 turn in and exhaust temp decreased big time, just like the airplane. My spark plugs look like new, no carbon deposits.
Other options: My IH C has notches on the throttle settings. When I bought it, someone set the carb so in the lowest position the butter fly in the carb was completely closed and engine would die. I have to put throttle on the 3 notch for it to idle properly. It's like turning off a diesel. Restrict air flow and engine stops.
My Terramite has a gas solenoid valve. To stop the 20 hp kohler command engine, the ignition switch, in the off position, would short out both coils, just like a lawn mower. I discovered that the engine would die in about 5 seconds if I removed power to solenoid. So I removed the coil wire from switch, turn key off and let the engine run out of gas in 5 seconds, no dieseling.
Recently I installed a gas solenoid on my Jubilee because the carb leaked gas on barn floor. If my Jubilee decides to diesel on a hot day, I will do the same thing, remove power from solenoid and let it run out of gas.
Try simply turning the gas off and let your tractor run out of gas. Bet it can't diesel with no gas in carb. Please try it and post back.
Yes, in my opinion, carbon will cause dieseling. Carbon is caused by too rich of a mix. Lean out your carb. A rich mix will also cause the oil on cyclinder walls to burn off, causing excessive ring wear. George
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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