The Mercury Mariner 30/40 HP 4-Stroke Outboard, manufactured between 1999 and 2003, represents a robust and reliable choice for marine propulsion. This water-cooled, 3-cylinder engine offers dependable performance, with models available at 30 HP and 40 HP, and a displacement of 49.1 cubic inches (805 cc). Engineered for efficiency and durability, these outboards are designed to provide consistent power for a variety of boating applications, reflecting Mercury Mariner's commitment to quality marine engineering. This Factory Service Repair Manual provides comprehensive guidance for the maintenance and repair of your Mercury Mariner 30/40 HP 4-Stroke Outboard. It covers essential procedures, technical specifications, troubleshooting steps, and safety guidelines necessary to keep your engine operating at peak performance. Whether you are performing routine maintenance, addressing a specific issue, or conducting in-depth repairs, this manual is an indispensable resource for owners and technicians alike.