This repair manual covers the Iveco C87-ENT-X Cursor 87-TE-X, a marine engine produced in 2007. As part of the Cursor 8 engine family, this model, specifically the C13 ENT M77.10, features an EUI injection system and an EDC7 UC31 ECU. Its robust engineering is designed for reliable marine applications, emphasizing durability and performance. The engine is water-cooled, utilizing both sea water and a coolant heat exchanger for efficient thermal management. This comprehensive English-language repair manual, published in June 2007, provides detailed guidance for the maintenance and overhauling of the Iveco C13 ENT M77.10 marine engine. It covers essential procedures including periodic checks, preparation for long idle periods, and first start protocols, alongside servicing of installed components. Diagnostic information for the EDC7 UC31 ECU, electrical system details, and complete overhaul procedures with technical data such as assembly clearances and tightening specifications are included. Safety rules and electrical diagrams for homologated installations are also addressed, empowering owners and technicians to maintain the engine effectively.