This workshop service manual covers Mercury Mariner outboard engines manufactured between 1977 and 1989, encompassing models from 45 to 220 horsepower. These 2-stroke engines, known for their robust construction and reliable performance, were designed for a wide range of marine applications. The manual provides in-depth information for various engine variants, including 4-cylinder, 3-cylinder, and V6 configurations, ensuring comprehensive support for owners and operators. This comprehensive English-language manual, exceeding 600 pages, is an essential resource for maintaining and repairing your Mercury Mariner outboard. It details critical procedures for safety, tuning, general maintenance, fuel systems, ignition, powerhead, electrical systems, trim and tilt, lower unit, remote controls, and starter systems. Designed for DIY enthusiasts, professional technicians, and workshops, this manual offers detailed guidance to ensure optimal performance and longevity of your engine.