The Volvo Penta AQ151 is a robust inline 4-cylinder engine featuring a 2.3L (140 cubic inch) displacement and fuel injection. Designed for reliability and efficient operation, this liquid-cooled engine is a testament to Volvo Penta's engineering quality. While specific production years are not detailed, this manual covers a range of model years, ensuring comprehensive support for owners and technicians alike. This Service and Repair Manual provides essential information for maintaining and repairing the Volvo Penta AQ151. It covers a wide array of topics including general and periodic maintenance, lubrication, troubleshooting diagnostic procedures, and detailed repair instructions for the engine, transmission, electrical system, chassis, suspension, steering, braking system, emission control, engine control, body, and restraint systems. Wiring diagrams are also included, making this an indispensable resource for ensuring optimal performance and longevity of your marine propulsion system.