This manual provides comprehensive technical information for the Yanmar 2S Marine Diesel Engine, designed for marine propulsion. The Yanmar 2S is a reliable marine diesel engine known for its robust engineering and efficient performance. This service repair manual offers detailed instructions and high-resolution diagrams to ensure proper operation and longevity of your marine diesel engine. The purpose of this English-language manual is to guide owners and mechanics through all aspects of engine maintenance and repair. It covers periodic checking and servicing, engine disassembly and reassembly, maintenance standards for key components, and troubleshooting countermeasures for common engine issues. Additionally, it includes guidance on engine storage and information regarding fuel and lubricating oil, making it an essential resource for both do-it-yourself enthusiasts and experienced technicians.