This manual covers Westerbeke W-52/63B & 63C-FOUR Marine Diesel Engines and 15KW-60Hz & 12KW-50Hz Generators. These marine diesel engines and generators are engineered for reliability and performance in demanding marine environments. The comprehensive documentation provided ensures that owners and operators can understand the intricacies of their Westerbeke equipment, facilitating optimal operation and longevity. This Factory Service/Repair/Workshop Manual in English provides all necessary information for maintenance, troubleshooting, and repair. It includes step-by-step instructions, detailed exploded diagrams, and wiring schematics for both engine and generator systems. Coverage extends to all repair procedures, engine disassembly and assembly, lubrication system maintenance, fuel system troubleshooting, and generator diagnostics, empowering users to maintain and repair their Westerbeke equipment effectively.