The Yuchai YC6MK Marine Main Engine is designed for inland waterway transport vessels, fishing boats, and leisure craft operating under demanding conditions. It is widely used on 700–1,500-ton inland cargo vessels, 18–26-meter fishing boats, and various types of sightseeing boats. By combining proven European engineering concepts with Yuchai’s advanced manufacturing experience, the YC6MK delivers reliable performance, strong fuel efficiency, and comfortable operation, making it a dependable marine propulsion solution.

Reliable and Durable

The Yuchai YC6MK Marine Main Engine follows strict mechanical development and validation standards. During development, the engine undergoes extensive testing, including thermal shock tests, high- and low-temperature tests, crankshaft fatigue tests, and more than ten additional durability validations. In addition, Yuchai applies advanced European development procedures to ensure high reliability. As a result, the engine achieves a major overhaul interval exceeding 12,000 hours. Moreover, the integrated crankcase, rear-mounted gear train, and patented point-line meshing technology reduce mechanical noise and improve overall durability.

Fuel Efficient and Cost Effective

The YC6MK marine engine adopts Yuchai’s advanced proprietary electronic control technology. This system enables flexible fuel injection control, high injection pressure, and precise combustion management. Consequently, the engine operates smoothly with low combustion noise, strong low-speed torque, and fast throttle response. Furthermore, four-valve technology significantly increases intake and exhaust flow area, while the centrally positioned injector ensures finer fuel atomization and more complete combustion. In addition, Yuchai’s proprietary piston ring sealing and valve stem seal technologies reduce lubricating oil consumption by more than 50 percent compared with domestic engines in the same power range.

Safe and Comfortable Operation

The Yuchai YC6MK Marine Main Engine is equipped with digital intelligent local and remote monitoring instruments, allowing operators to monitor engine status in real time. At the same time, the integrated cast-iron freshwater-cooled exhaust manifold effectively lowers engine room temperature. As a result, the engine provides safer operation and a more comfortable onboard environment for crew and passengers alike.