This document provides comprehensive technical information for the Mercury Mariner outboard engine, specifically models with 115 HP. Designed for reliable performance, this gasoline-powered, water-cooled engine features a CDI ignition system and an outboard gearcase transmission with forward, neutral, and reverse gears. Its robust engineering ensures dependable operation across various marine applications. This Workshop Service Repair Manual in English details all aspects of the Mercury Mariner 115 HP outboard engine. It covers essential maintenance procedures, including service intervals and fluid specifications for engine oil and gearcase lubricant. Furthermore, the manual offers in-depth troubleshooting guidance for common issues and outlines diagnostic procedures, making it an indispensable resource for owners and technicians alike to maintain and repair the engine effectively.