Abstract
International Maritime Organization (IMO) has been adopted the regulations on ships operational. MARPOL 73/78 has revealed six appendixes. Especially, the regulation on ships sailling Sulphur Emission Control Area (SECA) with low sulphur fuel. After 2020, all ships operate on the international ocean have to use the low sulphur content fuel oil with 0.50% m/m to protect the sea environment. However, the negative influence on piston-cylinder group will increase. So, the author has been conducting on doing research the regulations of MARPOL 73/78 and recommending some methods in aim with decreasing the negative influence on piston-cylinder group of marine diesel engine and fuel oil supply pump.