This service manual covers the YANMAR 3JH5E, 4JH5E, 4JH4-TE, and 4JH4-HTE series marine inboard engines. These engines are engineered for reliability and performance in demanding marine environments. Their robust construction and advanced technology ensure efficient operation and long service life, making them a trusted choice for various marine applications. This manual provides comprehensive information to understand, operate, and maintain these YANMAR engine models.

The purpose of this manual is to serve as a complete reference for owners, technicians, and mechanics. It details essential maintenance procedures, diagnostic troubleshooting, technical specifications, and safety guidelines necessary for the proper upkeep and repair of the YANMAR 3JH5E, 4JH5E, 4JH4-TE, and 4JH4-HTE series engines. By following the instructions within this manual, users can ensure optimal engine performance, longevity, and safe operation.