This manual covers Volvo Penta 4.3 series marine engines, including variants such as 4.3 GL-A/B/C, 4.3 GXi-A/B(F)/C(F)/D(F)/E(F), and 4.3 OSi-B(F)/C(F)/D(F)/E(F). These internal combustion V6 engines, with a displacement of 4.3 liters, are known for their robust engineering and reliability in marine applications. While specific production years are not detailed, this manual is designed to provide comprehensive support for these powerful and dependable marine power units. The purpose of this service and repair manual is to assist owners, mechanics, and technicians in maintaining and repairing their Volvo Penta 4.3 engines. It includes detailed, illustrated, step-by-step procedures for general information, mechanical aspects of the engine, steering, throttle and shift controls, and the cooling system. Furthermore, the manual offers troubleshooting assistance and covers engine removal and installation, making it an invaluable resource for both DIY enthusiasts and professional users seeking to ensure optimal performance and longevity of their marine propulsion system.