This service repair shop manual covers Yanmar Inboards, encompassing all marine inboard engines produced between 1975 and 1998. These engines are renowned for their robust engineering and reliability in marine applications. Designed for demanding maritime environments, Yanmar's inboard diesel engines have consistently delivered dependable performance, making them a trusted choice for a wide range of vessels. This manual provides detailed information specific to these engines, ensuring their continued operational excellence. The purpose of this comprehensive English-language manual is to equip owners, mechanics, and technicians with the necessary knowledge for effective maintenance and repair. It delves into detailed procedures, technical specifications, and essential troubleshooting guides, all presented with professional quality. By following the instructions within this document, users can confidently perform routine maintenance, diagnose issues, and execute repairs, thereby preserving the longevity and performance of their Yanmar inboard engines.