Main EngineTwo stroke diesel engines are mainly used as a main engine onboard ship which helps to rotate the propeller of the ship by which ship moves.Working operation: In the two stroke diesel engine cycle is competed in two stroke of the piston. In two stroke of the piston crankshaft takes one revolution or we can say that in one power stroke crankshaft take one revolution.First fresh charge air (Scavenge air) enters into the cylinder liner through the scavenge port to clear out the exhaust gases. Than scavenge port are covered by the piston as the piston moves from BDC to TDC. Now the air is start getting compressed and like this first stroke will be complete in which air is drown and compressed so this stroke is called suction and compression strokeNow after compression of the air inside the cylinder piston reaches to the before TDC and fuel will be injected through fuel injector and combustion takes place in the combustion chamber. As the combustion takes place the hot gases will produce and they try to expand but there is no space to them for expanding so they will push the piston downward to BDC. When the piston coming down because of power generation on piston at the same time piston will uncover the scavenge port so again scavenge air will start enter and exhaust gas will go out through the exhaust valve. So this stroke is known as power and exhaust stroke.