This manual covers the Mercury Mariner 30 HP 4 Stroke Outboard, manufactured between 1999 and 2003. These outboards are engineered for reliable performance and efficiency, making them a strong choice for a variety of boating applications. Their robust construction and proven 4-stroke technology ensure dependable operation and longevity, providing boaters with confidence on the water. This comprehensive workshop service manual provides detailed information essential for the maintenance and repair of your Mercury Mariner outboard. It includes step-by-step procedures for all major service and overhaul tasks, technical specifications, troubleshooting guides, and safety recommendations. By following the instructions within this manual, owners and technicians can ensure their outboard remains in optimal condition, maximizing its performance and lifespan.