This document pertains to the Volvo Penta AQ151, an internal combustion engine designed for marine applications. While specific production years are not detailed, the AQ151 is recognized for its robust engineering and reliability, making it a dependable choice for boat owners and operators. Its design emphasizes performance and durability, ensuring consistent operation in demanding marine environments. This comprehensive workshop service and repair manual provides extensive information for maintaining and servicing the Volvo Penta AQ151. It includes detailed step-by-step repair instructions, periodic maintenance charts, troubleshooting guidance, and wiring diagrams. The manual is intended for both professional technicians and DIY mechanics, offering hundreds of pages of diagrams and detailed information to ensure proper upkeep and repair of the engine.