This workshop service repair manual covers Mercury Mariner outboard engines manufactured between 1988 and 1993. These early models, part of the pre-2000s generation, are known for their reliable 4-cylinder outboard design, delivering 115 horsepower. The engines feature oil injection systems and carburetion, and this manual provides comprehensive coverage for their ignition, electrical charging and starting systems, as well as timing and synchronizing adjustments. The purpose of this manual is to provide detailed technical information and procedures for the maintenance, repair, and servicing of your Mercury Mariner outboard. It includes extensive coverage of engine specifications, troubleshooting, electrical diagnostics with wiring diagrams, and procedures for the gear housing and lower unit. With hundreds of pages of information, this English-language manual is designed to assist owners, mechanics, and technicians in keeping their engines operating at peak performance and reliability.