This service repair manual covers Mercury Mariner outboard engines, including the 45 Jet, 50, 55 Marathon, 55 SeaPro, and 60 models. These engines feature a 60.1 cubic inch (985 cc) displacement and an inline 3-cylinder configuration, delivering power outputs ranging from 45 to 60 horsepower. Engineered for reliability and performance, these outboards are designed for a wide range of marine applications, providing dependable propulsion for various watercraft. This comprehensive English-language manual provides essential information for maintaining and repairing your Mercury Mariner outboard. It details critical procedures, technical specifications, and troubleshooting guidance. Covered topics include lubrication requirements for the gearcase and trim/tilt systems, spark plug gap specifications, and general maintenance schedules. This resource is indispensable for owners, technicians, and mechanics seeking to ensure the optimal performance and longevity of their Mercury Mariner engines.