This workshop service repair manual covers the Mercury Mariner 100 HP 4 Cylinder Outboard, produced between 1988 and 1993. Designed for reliable performance on the water, these outboards are known for their robust engineering and efficient operation. This manual provides comprehensive details to ensure optimal functionality and longevity of your Mercury Mariner outboard. This comprehensive English-language manual offers extensive guidance for service, maintenance, and troubleshooting. It includes detailed information on the engine's powerhead, fuel system, oil injection, electrical and ignition systems, charging and starting systems, lower unit, mid-section, and power trim. Additionally, it covers installation, engine attachments, tiller handle operation, and provides essential wiring diagrams. This resource is invaluable for owners and technicians alike in maintaining and repairing the Mercury Mariner 100 HP 4 Cylinder Outboard.