This manual covers the Mercury Mariner SeaPro outboard engine, a robust and reliable power unit designed for demanding marine applications. With a 55 horsepower output, this water-cooled, carbureted engine typically features an inline 3-cylinder configuration and a displacement of approximately 93.1 cubic inches (1526 cc). Its engineering prioritizes durability and consistent performance, making it a trusted choice for commercial and recreational use where dependable operation is paramount. The SeaPro designation signifies a focus on heavy-duty capabilities and longevity. This comprehensive Factory Service Repair Manual provides essential information for the maintenance, repair, and troubleshooting of your Mercury Mariner SeaPro outboard. It details critical procedures, technical specifications, and safety guidelines necessary for optimal engine performance and longevity. Covering areas such as lubrication, ignition, fuel systems, and electrical components, this English-language manual is an indispensable resource for owners, technicians, and mechanics seeking to preserve the integrity and functionality of their Mercury Mariner SeaPro engine.