This comprehensive service manual covers the Lombardini 4LD series diesel engines, specifically models 640, 705, and 820. Designed for robust performance and reliability in demanding applications, these engines are engineered to provide consistent power and durability. Their robust construction and efficient combustion make them suitable for a wide range of industrial, agricultural, and marine uses where dependable operation is paramount. This manual serves as the definitive guide to understanding, maintaining, and servicing these high-quality diesel power units.

The purpose of this manual is to provide detailed information essential for the proper operation, maintenance, and repair of the Lombardini 4LD series diesel engines. It encompasses a complete overview of technical specifications, diagnostic procedures, routine maintenance schedules, and step-by-step repair instructions. Owners, technicians, and mechanics will find the enclosed information invaluable for ensuring the longevity, optimal performance, and safe operation of their Lombardini engines. Adhering to the guidelines within this manual will facilitate efficient troubleshooting and effective servicing.