This workshop service repair manual covers the Mercury Mariner 65/80 HP Jet outboard engine. Designed for reliable performance, these engines utilize an outboard jet drive system and are water-cooled. While specific production years and generations are not detailed, this manual applies to the relevant configurations of the 65 HP and 80 HP models, providing comprehensive information for their upkeep and operation. This official factory manual, presented in English and spanning hundreds of pages, is an essential resource for maintaining and repairing your Mercury Mariner outboard. It offers detailed guidance on all aspects of the engine, including service intervals, oil capacities, ignition and cooling systems, fuel requirements, and troubleshooting procedures. Owners, mechanics, and technicians will find the technical specifications, diagnostic information, and step-by-step instructions invaluable for ensuring optimal performance and longevity.