The Volvo Penta AQ260 is a marine engine designed for reliable performance, featuring a 5.7L (350 cubic inch) V8 configuration. This engine, typically producing approximately 260 horsepower, is engineered with robust components such as a cast iron engine block and either cast iron or aluminum cylinder heads, depending on the specific variant. It is equipped with a carbureted fuel system and can utilize either a closed cooling or raw water cooling system, with ignition systems varying between breaker point and electronic types. The AQ260 is paired with a stern drive, designed for efficient power transfer in marine applications. This Workshop Service Repair Manual provides comprehensive guidance for the Volvo Penta AQ260 marine engine and its associated stern drive. It covers a wide range of topics essential for maintenance and repair, including complete disassembly and reassembly procedures, routine maintenance schedules, detailed troubleshooting for electrical systems with accompanying wiring diagrams, and in-depth information on the engine's fuel, ignition, cooling, and electrical systems. With hundreds of photos and illustrations, step-by-step instructions, and critical notes, cautions, and warnings, this manual is an indispensable resource for owners, mechanics, and technicians to ensure the optimal performance and longevity of their vessel's propulsion system.