This workshop service manual covers the Mercury Mariner 80 HP 3 Cylinder outboard engine, manufactured between 1987 and 1993. This engine is a water-cooled, 3-cylinder outboard with a displacement of 1.6 L and a horsepower rating of 80 HP. It features a carbureted fuel system and a CD ignition system, typical for its era. The drive system consists of an outboard lower unit with Forward, Neutral, and Reverse gears. This manual provides detailed information to ensure the continued performance and longevity of your Mercury Mariner outboard. The purpose of this manual is to provide comprehensive guidance for the maintenance, repair, and overhaul of the Mercury Mariner 80 HP 3 Cylinder outboard. It includes detailed procedures for essential maintenance tasks such as spark plug replacement, water pump impeller replacement, and fuel filter replacement, along with recommendations for engine oil and gearcase lubricant. The manual also covers technical specifications and troubleshooting, empowering owners, mechanics, and technicians to effectively service and maintain the engine, ensuring optimal operation and reliability.