This manual pertains to the Mercury Mariner outboard motor, a versatile and reliable power unit designed for a variety of marine applications. While specific production years are not detailed, this service repair manual covers models likely spanning several years, all featuring a 15 horsepower rating. The Mariner outboard is engineered for dependable performance, incorporating a water-cooled, carbureted engine system and a straightforward Forward, Neutral, Reverse (F-N-R) gear shift. Its robust construction and efficient design make it a suitable choice for boaters seeking consistent power and ease of operation on the water. The purpose of this comprehensive service repair manual is to provide detailed guidance for the maintenance, troubleshooting, and repair of your Mercury Mariner outboard motor. It covers essential operational procedures, technical specifications, and recommended maintenance schedules, including details on lubrication, spark plug specifications, and ignition systems. Whether you are an owner performing routine upkeep or a technician undertaking more complex repairs, this manual offers the necessary information to ensure your outboard motor operates at peak performance and longevity.