The YANMAR 3YM20 is a robust marine diesel engine designed for reliability and efficient operation. This 3-cylinder, water-cooled engine features a 0.903 L displacement and indirect injection, delivering 19.5 PS at 3600 RPM. Its forced lubrication system and electric start ensure dependable performance in marine environments. Engineered for demanding maritime applications, the 3YM20 is a testament to YANMAR's commitment to quality and durability, making it a trusted choice for various vessel types. This Factory Service Repair Manual provides comprehensive guidance for the YANMAR 3YM20 marine diesel engine. It covers essential maintenance procedures, detailed troubleshooting steps, and critical technical specifications necessary for optimal performance and longevity. Owners, mechanics, and technicians will find detailed information on engine systems, fluid capacities, and recommended service intervals. This manual is an indispensable resource for ensuring the proper upkeep and repair of your YANMAR 3YM20.