This manual covers Mercury Mariner outboard motors, specifically the 3-cylinder models from 1987-1993 and 4-cylinder models from 1988-1993. These engines, offered in horsepower ratings from 70 to 115, represent a range of reliable and robust marine propulsion units. The engineering behind these outboards emphasizes durability and performance, making them a trusted choice for various boating applications. This service repair manual provides comprehensive information to ensure these engines operate at peak efficiency. The purpose of this English-language Service Repair Manual is to provide detailed guidance for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard. It includes in-depth procedures for engine systems such as ignition, carburetion, fuel, oil injection, starting, and battery charging. Additionally, the manual covers service for the lower unit, gear housing, mid-section, shock absorbers, power trim systems, and controls like tiller handles and Co-Pilot. Essential technical specifications, wiring diagrams, and installation guidelines are also included, empowering owners and technicians to effectively maintain and service these engines.