The Mercury Mariner Outboard, produced from 1999 onwards, represents a robust line of four-stroke outboard engines designed for reliable performance. Available in 40 HP, 45 HP, and 50 HP variants, these engines often feature the Bigfoot designation, indicating a specialized lower unit engineered for enhanced torque and durability. This series is built upon a foundation of quality engineering, aiming to provide dependable power for a variety of marine applications. This comprehensive workshop service and repair manual, written in English, provides extensive guidance for maintaining and repairing your Mercury Mariner Outboard. It covers a vast array of topics, including detailed diagnostic procedures, step-by-step repair instructions for general maintenance and engine rebuilding, essential electrical system wiring diagrams, and precise torque specifications. With original manufacturer data, this manual is an indispensable resource for owners, technicians, and mechanics seeking to ensure the optimal performance and longevity of their Mercury Mariner Outboard engines.