This manual covers the Mercury Mariner outboard motor, a gasoline-powered, 4-stroke engine designed for marine applications. While specific production years are not detailed, this service repair workshop manual provides comprehensive information for this model. The Mercury Mariner is engineered for reliability and performance, featuring a water-cooled system and a 45 HP engine. It is equipped with various control systems, including throttle/shift linkage and tiller handle, and utilizes clamp/swivel brackets for mounting. This extensive manual is designed to assist owners, mechanics, and technicians in maintaining and repairing the Mercury Mariner outboard motor. It includes detailed procedures for general maintenance, lubrication systems, electrical systems (charging, starting, and ignition), fuel systems (carburetor and fuel pump), and powerhead components such as the cylinder head and block/crankcase. Furthermore, the manual covers trim and tilt systems, emissions control, installation procedures, and control linkage attachments, providing all necessary technical specifications and wiring diagrams for thorough service.