This workshop repair service manual covers Mercury Mariner 25 HP Outboard gasoline engines. Engineered for reliability and performance, these outboard motors are designed for a wide range of marine applications. The 25 HP engine provides ample power for various watercraft, featuring a water-cooled system for efficient operation. Its outboard lower unit transmission offers forward, neutral, and reverse gears, ensuring versatile maneuverability on the water. This comprehensive manual is designed to assist owners and technicians in maintaining and repairing the Mercury Mariner 25 HP Outboard. It includes detailed information on service intervals, fluid capacities, and a troubleshooting guide to address common issues. The manual provides extensive technical information, ensuring that all aspects of the engine, from routine maintenance to complex repairs, can be managed effectively.