This manual covers the IVECO C13-ENS-M33 and C13-ENT-M50 internal combustion engines. These engines are engineered for robust performance and reliability, designed to meet demanding operational requirements. Their advanced internal combustion technology ensures efficient power delivery and durability, making them a cornerstone for various applications where dependable engine performance is critical. The purpose of this comprehensive service repair manual is to provide detailed guidance for the maintenance and repair of these IVECO engines. It includes essential information on general procedures, engine mechanical systems, fuel, exhaust, cooling, lubrication, electrical, intake, and preheating systems. This manual is an indispensable resource for owners, mechanics, and technicians, offering the technical specifications and step-by-step instructions necessary to ensure optimal engine function and longevity.