This workshop service repair manual covers 3-cylinder engines, specifically models 430447 and 580447. These internal combustion, 4-cycle, liquid-cooled petrol engines are engineered for reliability and performance. The manual details various engine configurations, including their in-line cylinder layout and gear-driven timing mechanism. While specific power and torque outputs are not detailed, the manual provides comprehensive information on components such as the cylinder head, valve train, governor system, crankshaft, camshaft, lubrication, fuel delivery, ignition, starting, electrical, and charging systems. This comprehensive English-language manual is designed to assist both professional mechanics and non-experienced users in maintaining and repairing their engines. It includes detailed sections on general information, service specifications, maintenance schedules, tightening torques, troubleshooting, and special tools. With high-definition diagrams and bookmarks for easy navigation, this document is compatible with all Windows and Mac operating systems, requiring Adobe Acrobat Reader and WinZip/WinRAR for access. The manual's scope ensures thorough understanding and effective servicing of the engine's complex systems.