This manual covers the Detroit Diesel DD13, DD15, and DD16 engine models. These engines are engineered for robust performance and reliability, designed to meet the demanding requirements of various applications. Their advanced design focuses on delivering efficient power output and durability, making them a trusted choice for heavy-duty operations. The purpose of this manual is to provide comprehensive guidance on the service and repair of the engine and fuel systems for the specified Detroit Diesel models. It details essential procedures and information necessary for maintaining the optimal functioning of these critical components. Owners and technicians will find the information invaluable for ensuring the longevity and performance of their engines.