This repair manual covers Mercury Mariner outboard motors manufactured between 1977 and 1989, encompassing a wide range of 2-stroke engines from 45HP to 220HP. These robust engines are known for their reliable performance and are designed for a variety of marine applications. This manual provides comprehensive information to ensure the longevity and optimal functioning of your Mercury Mariner outboard. The purpose of this 609-page English-language repair manual is to serve as a definitive guide for owners, technicians, and mechanics. It details complete teardown and rebuild procedures, includes essential part diagrams, torque specifications, and maintenance schedules. Furthermore, the manual offers in-depth troubleshooting guidance for common issues, covering all major systems including the fuel, ignition, cooling, electrical, and drive trains, as well as specific components like carburetors, pistons, and crankshafts.