This manual covers the Westerbeke 71B-FOUR/71C-FOUR Marine Diesel Engine and the associated 20.0KW-60HZ/16.0KW-50HZ BED, 20.0KW-60HZ/16.0KW-50HZ BEDA Marine Diesel Generators, available in single and three-phase configurations. These robust marine diesel engines and generators are engineered for reliability and performance in demanding marine environments. The 71B-FOUR/71C-FOUR engine series, paired with the powerful and efficient BED/BEDA generator models, provides essential power for a wide range of maritime applications. The purpose of this Service Repair Manual is to provide comprehensive guidance for the maintenance, service, diagnosis, and repair of these Westerbeke marine diesel engines and generators. It includes detailed information on engine and generator components, troubleshooting procedures for engines and generators, electrical system schematics, and engine adjustments. With step-by-step instructions, detailed diagrams, and essential service data, this manual is an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their Westerbeke equipment.