This Service Repair Manual covers the 1998 Mercury Mariner 30HP and 40HP outboard motors, manufactured by Mercury Marine. These robust internal combustion engines are designed for reliable marine propulsion, utilizing a gasoline fuel source and a propeller drive system. Engineered for performance and durability, these four-stroke motors provide dependable power for a variety of boating applications, reflecting Mercury Marine's commitment to quality and innovation in the marine industry.

This comprehensive manual provides essential information for the maintenance, repair, and servicing of your Mercury Mariner outboard motor. It details crucial procedures, technical specifications, and troubleshooting guidance to ensure optimal performance and longevity. Owners, technicians, and mechanics will find this English-language document invaluable for understanding and performing all necessary upkeep, from routine servicing to in-depth repairs, thereby maximizing the operational life and efficiency of the marine propulsion unit.