This workshop service manual covers the Mercury Mariner Jet Outboard, a powerful marine propulsion system designed for a variety of watercraft. While specific production years are not detailed, this manual focuses on the engineering and operational aspects of this 65 HP jet drive unit, which utilizes a water-cooled system and gasoline fuel. Its robust construction and reliable performance make it a suitable choice for demanding marine applications. This comprehensive manual provides essential information for owners, mechanics, and technicians. It details critical maintenance procedures, including service schedules, lubrication requirements, and filter replacement intervals. Furthermore, it offers guidance on troubleshooting common issues and outlines technical specifications necessary for proper operation and repair. The content assumes a foundational understanding of marine engine practices, enabling users to effectively maintain and service their Mercury Mariner Jet Outboard.