The Mercury Mariner 70 HP outboard motor, part of the First Generation, was produced between 1987 and 1993. This water-cooled, 3-cylinder engine delivers 70 horsepower and features a CDI ignition system and carbureted fuel delivery, designed for reliable performance on a variety of watercraft. Its robust engineering ensures dependable operation for recreational and professional use. This Workshop Service Repair Manual provides comprehensive guidance for the Mercury Mariner 70 HP outboard motor. It covers essential maintenance procedures, troubleshooting techniques, detailed technical specifications, and critical safety information. This manual is an indispensable resource for owners, mechanics, and technicians seeking to maintain, repair, and optimize the performance and longevity of their Mariner 70 HP engine.