Hey Old Piston ring end-gap positioning is determined by the piston design.One piece aluminum piston ring gap should be 120 Degrees apart.On a 2 piece cross head piston like the one used for the Detroit Diesel series 50 and 60 180 degrees apart 1st and 3dr ring.On a two cycle Detroit Ddiesel you fallow the direction that come with the pack. There are 3 top rings 120 degrees apart. They have 4 oil controll rings with 2 expanders, and the expanders are color coded for the application,city bus, on highway etc.the color determines the expander's tension.
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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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