This manual covers the 1976 Mercury Mariner 850 XS, an outboard engine renowned for its robust construction and reliable performance. Designed for a variety of marine applications, this 4-cylinder, water-cooled engine delivers 90 horsepower, offering dependable power for recreational and professional use. Its engineering reflects the quality and durability expected from Mercury Mariner, ensuring a strong operational foundation for its intended purpose on the water. The purpose of this comprehensive English Service Repair Manual is to provide detailed guidance for the maintenance, troubleshooting, and repair of the 1976 Mercury Mariner 850 XS. It includes step-by-step instructions, exploded diagrams, and high-quality images covering all aspects of the engine and its systems. This manual is an essential resource for owners, mechanics, and technicians seeking to ensure the longevity and optimal performance of their Mercury Mariner outboard engine.