This workshop service manual covers the Mercury Mariner 15 HP 4-stroke outboard engine with a displacement of 323 cc. Engineered for reliability and performance, this water-cooled outboard is designed for a variety of marine applications. Its robust construction and efficient 4-stroke design ensure dependable operation, making it a suitable choice for recreational boating and other watercraft needs. This comprehensive manual provides detailed information for the repair and overhaul of your Mercury Mariner outboard. It includes essential procedures, technical specifications, and maintenance schedules to ensure optimal performance and longevity. Owners, mechanics, and technicians will find guidance on all aspects of service, from routine maintenance like oil and spark plug changes to in-depth repair and troubleshooting, all presented in English.