This manual covers the Volvo AQ120 engine family, a robust inline 4-cylinder, water-cooled unit with a displacement of 2.1 liters and an approximate power output of 130 horsepower. Typically featuring a carbureted fuel system and distributor ignition, this engine is designed for marine applications, often paired with sterndrive or inboard transmissions. Its construction, typically utilizing a cast iron block and aluminum cylinder head, speaks to Volvo's commitment to durability and performance in demanding environments. This comprehensive Factory Service Repair Manual, written in English, provides essential information for the maintenance and repair of your Volvo AQ120 engine. It details critical procedures, technical specifications, and troubleshooting guidance necessary for optimal performance and longevity. Owners, mechanics, and technicians will find detailed instructions on service intervals, filter types, and other vital aspects of engine care, ensuring the continued reliability of this powerful marine engine.