This workshop service repair manual covers the Mercury Mariner 45 HP 4 Stroke Outboard motor. Designed for reliability and performance, these outboard engines are engineered to provide dependable power for a wide range of marine applications. This manual encompasses all model years, engine types, and transmission configurations, ensuring comprehensive support for your Mercury Mariner outboard. This manual provides detailed instructions and technical information necessary for the proper maintenance, repair, and troubleshooting of your Mercury Mariner 45 HP 4 Stroke Outboard. It includes extensive maintenance procedures, diagnostic steps, and repair guidance for all major systems, including the electrical, fuel, powerhead, mid-section, gear housing, trim and tilt, and controls. With clear explanations and diagrams, this manual serves as an essential resource for owners, mechanics, and technicians seeking to maintain optimal performance and longevity of their outboard motor.