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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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