Nanni marine diesel engine N9.510 with ZF Hurth reversing gear CR2INVZF286AR=1.962:1

The Nanni N9.510 CR2 is a 6-cylinder in-line marine diesel engine built on a 9-liter John Deere engine block. It delivers an output of 373 kW (507 hp) at a rated speed of 2400 rpm and produces a peak torque of 1869 Nm. This advanced common-rail unit features replaceable wet-type cylinder liners, 4 valves per cylinder, a turbocharger, and an air-to-seawater aftercooler. In this propulsion package, the engine is paired with a heavy-duty hydraulic ZF Hurth ZF 286 A marine gearbox. This premium transmission features a 7° down-angle output, allowing for a flatter, more streamlined propeller shaft installation inside the hull. Combined with a precise 1.962:1 reduction ratio, this configuration is perfectly engineered for semi-displacement hulls, fast motor yachts, and commercial craft requiring a robust, high-torque drivetrain. The complete package includes a closed cooling system with a heat exchanger, a dedicated transmission oil cooler, and a 24V electrical architecture fitted with a 100-Amp alternator. Holding an M4 duty rating (up to 3000 annual operating hours with a load factor up to 40%), the engine complies with RCD2 2013/53/EU, EPA Marine Tier 3, NRMM Tier 3, and IMO Marpol Annex VI emission standards.