This manual covers the Iveco Cursor C13 ENT M77 marine engine, produced in 2007. This 4-stroke, 6-cylinder engine features a 12880cc displacement and delivers a maximum power of 770hp, utilizing an Electronic Diesel Control (EDC) injection system. Its robust engineering is designed for demanding marine applications, emphasizing reliability and performance. Key systems include closed-loop fresh water cooling, open-loop sea water cooling, and an engine oil loop lubrication system, supported by an EDC7 UC31 detectable fault list and the PT-01 diagnostic instrument. This comprehensive workshop repair manual provides essential information for maintaining and repairing the Iveco Cursor C13 ENT M77 engine. It details periodic maintenance schedules, preparation for long idle periods, and startup procedures. Extensive sections cover on-engine servicing, including work on the injection system, belt replacement, heat exchanger cleaning, and engine disembarking. The manual also includes detailed overhaul procedures for major engine components such as the cylinder block, crankshaft, piston assembly, cylinder head, and timing gear, along with assembly clearances, tightening torques, and orders.