This workshop service manual provides comprehensive information for the Mercury Mariner outboard motor. Designed for reliable performance, this water-cooled, 10 HP engine utilizes a CD ignition system and an outboard gearcase with forward, neutral, and reverse gears for efficient propeller drive. While specific model years are not detailed, the manual covers a range of Mariner outboards, focusing on their robust engineering and intended use in various marine applications. This document serves as an essential resource for owners, mechanics, and technicians. It details critical maintenance procedures, including information on fluid capacities and fuel-oil mixtures, alongside troubleshooting guidance and technical specifications. Safety guidelines, such as the operation of the kill switch lanyard, are also included. By following the instructions within this manual, users can ensure the optimal performance, longevity, and safe operation of their Mercury Mariner outboard motor.