This workshop service manual covers Mercury Mariner 25 SeaPro outboard motors, designed for reliable performance in various marine applications. While specific production years are not detailed, this manual addresses the robust engineering and dependable operation characteristic of Mercury outboards. The 25 horsepower engine, likely featuring a 3-cylinder configuration, is built for durability and efficiency, providing ample power for a range of boating needs. Its raw water cooling system and adaptable steering mechanisms, whether tiller or remote, contribute to its versatility and widespread use. The purpose of this English-language manual is to provide comprehensive guidance for the repair and overhaul of Mercury Mariner 25 SeaPro outboard motors. It details essential maintenance procedures, troubleshooting techniques, and technical specifications necessary for keeping the engine in optimal condition. Owners, mechanics, and technicians will find detailed instructions and information to ensure proper upkeep and repair, drawing upon general automobile practices for a foundational understanding. This resource aims to facilitate effective maintenance and repair, maximizing the longevity and performance of your Mercury Mariner outboard.