The Yuchai YC6TD Marine Main Engine is designed as a reliable and efficient marine diesel engine for inland waterways and near-coastal vessels, including fishing boats and transport ships. During development, Yuchai followed strict mechanical validation and verification standards to ensure long-term durability and stable performance. Extensive bench durability testing exceeding 20,000 hours further confirms the YC6TD’s suitability for continuous marine operation. As a result, the YC6TD marine main engine provides dependable power for a wide range of commercial marine applications.

Reliable and Durable

The Yuchai YC6TD marine main engine features a high-strength alloy cast iron engine block that improves overall structural rigidity. In addition, an integral forged steel crankshaft enhances fatigue strength and wear resistance, ensuring long service life. The engine adopts a one-cylinder-one-head design, which simplifies maintenance and improves service efficiency. Evenly distributed cylinder head bolts ensure uniform load distribution, while a high-mounted camshaft valve train with short, rigid push rods and roller tappets further enhances operational reliability under demanding marine conditions.

Fuel Saving and Cost Efficient

The YC6TD marine diesel engine applies advanced four-valve technology to significantly increase intake and exhaust flow capacity. As a result, fuel atomization becomes more uniform and combustion more complete. Moreover, the combination of turbocharging with intercooling and an electronically controlled unit pump system allows precise fuel delivery, ensuring that fuel energy is fully utilized. Equipped with Holset or Lianxin turbochargers, the engine offers a wide economic operating range. Compared with engines of similar power, the YC6TD reduces fuel consumption by approximately 10–15%, while mechanical losses decrease by more than 15%.

Safe and Comfortable Operation

The four-valve design of the Yuchai YC6TD marine main engine effectively reduces intake and exhaust noise. In addition, a rear-mounted gear train combined with advanced point-line meshing gear technology lowers mechanical transmission noise. These features help create a quieter engine room environment, improving onboard comfort while maintaining safe and stable engine operation.

Overall, the Yuchai YC6TD Marine Main Engine combines durability, fuel efficiency, and low-noise operation, making it a dependable power solution for modern inland and coastal vessels.