This workshop service repair manual covers the Volvo Penta AQ255, a robust 5.7L (350 cubic inches) V8 engine designed for marine applications. Known for its reliable performance and durable construction, this engine is a testament to Volvo Penta's commitment to quality engineering. The AQ255 features a carbureted fuel delivery system, conventional distributor ignition, and a water-cooled system, making it a powerful and efficient choice for various boating needs. Its compatibility with stern drive systems and tilt/trim functionality further enhances its versatility and appeal. This comprehensive manual provides essential information for maintaining and repairing your Volvo Penta AQ255. It includes detailed step-by-step repair procedures, disassembly and assembly instructions, cleaning guidelines, and reinstallation processes. You will find hundreds of pages of diagrams, critical technical specifications, tuning information, and detailed wiring diagrams for electrical system diagnosis. Furthermore, the manual covers routine maintenance and troubleshooting comprehensively, along with important safety guidelines, ensuring you have all the resources needed to keep your engine in optimal condition.