This document pertains to the Mercury Mariner, an outboard engine designed for marine applications. While specific production years are not detailed, this engine is characterized by its water-cooled, 125 HP power output. It utilizes gasoline as fuel and features an impeller-type water pump and electric start. The engine is paired with an outboard lower unit transmission. This comprehensive Factory Service Repair Manual, written in English, provides essential information for the maintenance and repair of your Mercury Mariner. It covers detailed procedures for servicing, including tune-up guidelines and troubleshooting assistance. Technical specifications and component details are included to aid owners and technicians in understanding and maintaining the engine's optimal performance and reliability.