This document provides comprehensive service information for the Mercury Mariner Sea Pro outboard engine, featuring a 15 HP rating. Designed for reliable performance in marine environments, the Mariner Sea Pro series represents a commitment to robust engineering and dependable operation. This particular model, identified within the Sea Pro Series generation, is a gasoline-powered, water-cooled outboard unit equipped with a forward, neutral, and reverse gear system. Its focus on essential power and durability makes it a suitable choice for various boating applications where consistent performance is paramount. This Factory Service Repair Manual is your definitive guide to understanding, maintaining, and repairing your Mercury Mariner Sea Pro 15 HP outboard. It covers essential areas including detailed maintenance schedules, lubrication requirements, fuel system guidelines, ignition system specifications, and troubleshooting procedures. By providing in-depth technical data and step-by-step instructions, this manual empowers owners, technicians, and mechanics to ensure optimal performance, longevity, and safety of the engine. Adhering to the procedures outlined within will help maintain the integrity and operational efficiency of your Mercury Mariner Sea Pro.