This document pertains to the Mercury Mariner 8 HP 4-stroke outboard engine. Engineered for reliable performance on the water, this engine offers a robust 8 horsepower output, suitable for a variety of small craft and auxiliary power applications. Its water-cooled, 4-stroke design, coupled with a CDI ignition system, ensures efficient operation and durability. The outboard gearcase provides essential Forward, Neutral, and Reverse gear selection, driven by a propeller. This comprehensive workshop service manual is presented in English and serves as an indispensable resource for owners, technicians, and mechanics. It details critical maintenance procedures, including lubrication requirements for engine oil and marine gear lubricant, alongside recommended service intervals. Furthermore, the manual offers guidance on troubleshooting, technical specifications, and essential safety precautions to ensure the optimal performance and longevity of your Mercury Mariner outboard.