The original Farmall M was 6 volt whereas the Farmall MD used a 12 volt system (two 6 volt batteries in series to give 12 volts). Compared with the 6 volts for the gasoline/kerosene/distillate engines with from 4.25 to 1 (kerosene) up to 5.9 to 1 (gasoline) compression ratio engines the 12 volts would handle the MD with 6 to 1 compression ratio on gasoline for starting. The Farmall MD was only about 14 to 1 compression ratio on diesel, about as low as one can go for diesel engine. My small IH German built D-214 2 cylinder diesel engine has a 19 to 1 compression ratio.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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