This document pertains to the Mercury Mariner SeaPro outboard engine, a robust and reliable power unit designed for demanding marine applications. Engineered for performance and durability, this outboard motor delivers 25 horsepower, making it suitable for a variety of watercraft and operational needs. Its construction emphasizes quality and longevity, ensuring consistent performance across its service life. The SeaPro series is recognized for its dependable operation and suitability for commercial or heavy-duty recreational use. This comprehensive workshop service repair manual provides essential information for the maintenance, diagnosis, and repair of your Mercury Mariner SeaPro outboard. It covers critical areas including detailed specifications, routine maintenance procedures, troubleshooting guides, and component-level repair instructions. By following the guidelines within this manual, owners, technicians, and mechanics can effectively preserve the optimal performance and extend the operational lifespan of the engine, ensuring its readiness for all marine endeavors.