Abstract: In recent years, the calculation and design of engines mounted on tractors has obtained remarkable achievements. As a result, the number of engine produced and installed on these vehicles is very large, leading to redundancy. The large engine mounted on the tractor, the D243 is also in the same situation. Meanwhile, marine engines are in short supply and purchased from abroad, the cost is high. To solve this situation, the option of hydraulic engine D243 has been thought by many people and there have been a number of research topics on this issue. However, the engine compartment of a boat is usually small and closed, so the noise will be loud and directly affect the people living on the ship. Solving noise reduction for D243 engine is an urgent issue to reduce economy as well as reduce harm to people. Therefore, this paper will research, calculate and design a noise reduction system for the D243 engine when hydrate.

Keywords: Engine, tractor, noise, exhaust.