This workshop service repair manual covers the Yanmar SD40, SD40-4T, SD50, and SD50-4T Sail Drive models. These marine propulsion units are engineered for reliable performance in demanding marine environments, utilizing robust diesel engine drive systems. Their design emphasizes durability and efficiency, making them a trusted choice for a wide range of marine applications.

This manual provides comprehensive guidance for the maintenance and repair of your Yanmar Sail Drive. It details all service and repair procedures, including information on recommended lubricants and capacities. Whether you are performing routine maintenance or addressing complex repairs, this resource is designed to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of their marine diesel engine drive.