This manual covers the Mercury Mariner outboard motor, specifically models produced between 2002 and 2005. These EFI 4-stroke outboard motors deliver 30 HP and feature a water-cooled system and CDI ignition. Designed for reliability and performance, the Mariner series offers efficient operation with its Electronic Fuel Injection and outboard gearcase transmission, providing forward, neutral, and reverse gears. This comprehensive factory service repair manual provides detailed information essential for maintaining and repairing your Mercury Mariner outboard motor. It includes procedures for diagnosis, repair, overhaul, and routine maintenance, along with technical specifications and safety guidelines. Whether you are an owner, a professional mechanic, or a technician, this manual serves as an authoritative resource to ensure the optimal performance and longevity of your marine engine.