This manual covers marine inboard and sterndrive engines, specifically the 280-DP / 285-DP / 290-DP models. These versatile engines, available in 2.6L and 2.7L displacements, are designed for a range of marine applications. The included sterndrive systems, such as DP-A, DP-B, and DP-C variants, are engineered for performance and reliability, making them a trusted choice for boat owners and operators. This comprehensive Workshop Service Repair Manual provides detailed guidance for the repair and servicing of these sterndrives. It encompasses a wide array of critical information, including assembly and disassembly procedures, tightening torques, pressure and vacuum testing, and specific instructions for trim systems. The manual also features high-definition diagrams and wiring schematics, offering clear visual aids for professional mechanics and DIY enthusiasts alike, ensuring efficient and accurate maintenance and repair.