This workshop repair service manual provides comprehensive technical information for the Volvo AQ115 marine engine. This inline 4-cylinder, naturally aspirated engine displaces 2.0 liters and features a water-cooled system with distributor ignition and a carbureted fuel system. Designed for reliability and performance, the AQ115 engine delivers approximately 121 horsepower and 160 Nm of torque, making it suitable for a variety of marine applications. Its robust engineering ensures dependable operation for owners and operators. The purpose of this manual is to serve as a definitive guide for the maintenance, repair, and servicing of the Volvo AQ115 engine. It covers essential procedures such as oil changes, filter replacements, tune-up operations including spark plug and ignition timing adjustments, and carburetor settings. Detailed technical specifications, including engine dimensions, bore, stroke, and compression ratio, are provided to assist in accurate diagnosis and repair. This resource is invaluable for owners, mechanics, and technicians seeking to maintain the optimal performance and longevity of their Volvo AQ115 marine engine.