The Lombardini 1003 FOCS Engine Series, a line of robust and reliable diesel engines, is engineered for a wide range of applications. These liquid-cooled, 3-cylinder engines, featuring direct injection technology, offer dependable performance with power outputs typically ranging from 15 to 25 HP, depending on the specific application. Their compact design and efficient operation make them a favored choice for various industrial, agricultural, and marine equipment, embodying Lombardini's commitment to quality and durability. This comprehensive workshop service repair manual provides detailed guidance for all models within the 1003 FOCS Engine Series. It covers essential maintenance procedures, troubleshooting steps, technical specifications, and safety guidelines necessary for proper upkeep and repair. With clear illustrations, diagrams, and step-by-step instructions, this manual is an indispensable resource for owners, mechanics, and technicians seeking to perform DIY servicing, teardowns, repairs, and overhauls, ensuring the longevity and optimal performance of their Lombardini engines.