That is a hot bulb engine sometimes called a semi diesel. The head must be hot to run and will not will not start from cold unless the head is heated or a starting wick is used. What you are looking at is the cylinder head. At the top is the fuel injector. The tee handled plug in the middle is where a starting wick is lit on fire and inserted. Partially visable at the bottom is the hot bulb, this can be heated with a torch to start the tractor. The engine does not have enough compression to ignite the fuel. The injector introduces fuel to the hot bulb early in the compression stroke where it is turned into steam. As the compression comes up the steam is ignited by the extra heat created.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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