The Nanni N6.405CR2 is a 6-cylinder inline, 4-stroke diesel inboard marine engine based on a John Deere engine base, producing 405 HP (298 kW) from a 6.8-litre displacement. It features a high-pressure Common Rail direct injection fuel system with electronic control, turbocharged air-to-seawater aftercooling, and closed cooling with heat exchanger. The engine is HVO compliant and meets RCD2, EPA Marine Tier 3, IMO Marpol Annex VI, and NRMM Tier 3 emission standards.