This workshop service repair manual covers the Volvo Penta AQ151 marine engine. Designed as an internal combustion engine, the AQ151 features an inline cylinder layout, a displacement of 2.3 liters, and typically produces around 130 horsepower. Its robust construction and reliable performance make it a suitable choice for various marine applications. The engine utilizes a closed cooling system with a heat exchanger and an electronic ignition system, ensuring efficient operation and longevity in demanding marine environments. This comprehensive manual provides essential information for the maintenance, repair, and troubleshooting of the Volvo Penta AQ151 engine. It includes detailed instructions, diagrams, and specifications covering the engine's mechanical and electrical systems, as well as the fuel system. Owners, mechanics, and technicians will find valuable guidance on routine maintenance, component-level repairs, and diagnostic procedures. The manual is presented in English and is designed to be printable and easily navigable, ensuring users can efficiently access the information needed to keep their engine in optimal condition.