This manual covers the Daewoo DE12, DE12T, DE12TI, and DE12TIS diesel engines. These engines are designed for robust performance and reliability, suitable for a variety of heavy-duty applications. Their engineering emphasizes durability and efficiency, making them a dependable choice for demanding operational environments. This comprehensive guide provides essential information for the operation and maintenance of your Daewoo diesel engine. It details routine service procedures, troubleshooting guidance, and technical specifications to ensure optimal performance and longevity. By following the instructions within this manual, owners and technicians can effectively maintain and repair these engines, maximizing their operational lifespan and efficiency.