This Service Repair Manual covers the Volvo Penta AQ131 marine inboard engine. This water-cooled, 2.3-liter, 4-cylinder inline engine, equipped with a carbureted fuel system and a sterndrive Aquamatic gearbox, delivers 130 horsepower. Designed for reliable marine propulsion, the AQ131 is engineered for performance and durability on the water. This comprehensive manual provides essential information for maintaining and repairing your Volvo Penta AQ131. It details routine maintenance procedures, including oil change recommendations and capacity, alongside step-by-step instructions for various repair tasks. With included pictures and wiring diagrams, this English language manual is an indispensable resource for owners and technicians seeking to ensure the optimal performance and longevity of their marine engine.