This service manual covers MerCruiser D2.8L D-Tronic and D4.2L D-Tronic diesel marine engines manufactured between 1997 and 2002. These in-line diesel engines are designed for sterndrive (MCM) and inboard (MIE) applications, offering robust performance and reliability for marine use. The manual provides comprehensive information for serial number coverage 0K000001 and above, ensuring owners and technicians have access to detailed technical data for these specific engine configurations. The purpose of this manual is to provide professional technicians and experienced do-it-yourself mechanics with the necessary information for the maintenance and repair of these MerCruiser diesel engines. It includes detailed procedures for removal, disassembly, cleaning, assembly, and installation, alongside an advanced troubleshooting guide. With its inclusion of illustrations, diagrams, and specifications, this English-language repair manual is an essential resource for diagnosing and correcting problems, ensuring optimal engine performance and longevity.