This Service Repair Manual covers the Mercury Mariner 15 4-Stroke outboard, a water-cooled, gasoline-powered engine featuring a 323 cc displacement and a CDI ignition system. Designed for reliable performance, this outboard engine utilizes an oil pump lubrication system and is engineered with the quality and durability expected from Mercury. It is intended for marine propulsion applications where dependable power and efficient operation are paramount. This comprehensive manual provides detailed information essential for the maintenance and repair of your Mercury Mariner 15 4-Stroke. It includes step-by-step repair procedures, clear pictorial diagrams, exploded diagrams, and photographs to guide you through every task. The manual also contains crucial technical data, specifications, special tool references, and troubleshooting guidance. Safety information, including special notes and precautions, is prominently featured to ensure safe operation and service.