This workshop service repair manual covers the Volvo AQ125B, a 4-cylinder marine engine with a 2.3L displacement and approximately 141 horsepower. Designed for reliable performance, this engine represents a significant engineering achievement in its class. Its robust construction and efficient operation make it a dependable choice for a variety of marine applications. This comprehensive English-language manual provides detailed information on service, maintenance, and troubleshooting for the Volvo AQ125B. It is an essential resource for owners, mechanics, and technicians, offering guidance to ensure the optimal performance and longevity of the engine. By following the procedures outlined within, users can effectively maintain and repair their AQ125B unit.