This manual covers Mercury Mariner outboard motors manufactured between 1977 and 1989, specifically models ranging from 45HP to 220HP. These engines are recognized for their robust engineering and reliability, designed to provide dependable performance for a wide array of marine applications. This comprehensive workshop manual is an essential resource for understanding and maintaining the intricate systems of your Mercury Mariner outboard. The purpose of this Factory Service Repair Workshop Manual is to provide detailed guidance for the repair, servicing, and troubleshooting of your Mercury Mariner outboard motor. It includes hundreds of pages filled with step-by-step instructions, highly detailed exploded diagrams, and clear photographic illustrations. This manual is designed to assist owners, technicians, and mechanics in performing all necessary maintenance and repair procedures to ensure optimal performance and longevity of the engine.