This manual covers Mercury Mariner outboard engines manufactured between 2001 and 2006. These 4-stroke outboard engines, producing 50 HP, are engineered for reliability and performance in various marine applications. The manual details components such as the fuel system, ignition system, electrical system, and power trim and tilt mechanisms, offering comprehensive information for owners and technicians. This Factory Service Repair Manual provides detailed instructions for maintenance, general information, lubrication, and troubleshooting. It includes information on engine overhaul, covering powerhead components, cylinder head, and block, as well as transmission details for both standard and Bigfoot gear housings. With hundreds of pages, extensive illustrations, diagrams, and color wiring diagrams, this manual is an essential resource for maintaining and repairing your Mercury Mariner outboard.