This workshop service repair manual covers the Yanmar 3JH4 to 4JH4-HTE marine diesel engines. These engines are engineered for reliable performance in marine applications. The manual details every service and repair procedure necessary to maintain these diesel engines, ensuring their optimal functionality and longevity.

The purpose of this manual is to provide comprehensive guidance for service and repair. It includes detailed instructions, technical specifications, and essential information for owners, mechanics, and technicians. By following the procedures outlined within, users can effectively maintain and repair their Yanmar marine diesel engines.