• Weichai WP4.1 marine diesel engine series is the newly developed high-speed engine based on marine engine user behavior and working conditions, relying on Weichai’s 70 years of research and development experiences and introduction of advanced technology from home and abroad. The engine has a power of 40-60kW, compact structure, reliable operating, strong power, good economy, simple operation and convenient maintenance. The engine is developed according to the application status of similar products in the market. It is an ideal choice of power for small-sized offshore and inland river transport vessels, fishing boats and official business boat.