The YANMAR YSM is a marine diesel engine designed for reliable marine propulsion. Manufactured in Japan, this naturally aspirated, indirectly cooled diesel engine utilizes a compression ignition system and injection fuel delivery. Its robust construction and efficient operation make it a dependable choice for maritime applications. The YANMAR YSM series embodies the company's commitment to engineering excellence and product durability, ensuring consistent performance in demanding marine environments. This comprehensive service repair manual in English provides essential information for the maintenance and repair of your YANMAR YSM marine diesel engine. It covers critical aspects including routine maintenance procedures, technical specifications, and troubleshooting guidance. By following the detailed instructions and adhering to the recommended service intervals, owners and technicians can effectively preserve the engine's optimal performance, extend its service life, and ensure safe operation.