This manual covers the Yanmar YSM8-R, YSM8-Y, YSM12-R, and YSM12-Y marine diesel engines. These engines are designed for marine propulsion and are powered by diesel fuel. The YSM8 models offer 8 horsepower, while the YSM12 models provide 12 horsepower. Yanmar is known for its engineering quality and reliability in marine applications, ensuring dependable performance for your vessel.

This workshop service repair manual provides comprehensive guidance for the maintenance, repair, and troubleshooting of your Yanmar marine diesel engine. It details essential procedures, technical specifications, and safety guidelines necessary for optimal engine operation. By following the instructions within this manual, owners and technicians can effectively maintain the longevity and performance of their YSM series engines.