The pressure is an indication of the compression stroke. The pressure lasts only as long as the piston is moving up. It should fire the plug at the very top of that stroke. Thus TDC. Putting a new pencil in the spark plug hole just after you feel the pressure start, will allow you to be very accurate as to when the piston is at the very top. (number 1 is the front cylinder to the radiator) Best of luck. Jim
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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