| Manufacturer / Brand | FNM Marine (CMD Costruzioni Motori Diesel) |
| Model Designation | 42HPE-350 Inboard Shaft Package |
| Engine Type | 4-Stroke High-Speed Commercial Marine Diesel |
| Cylinder Configuration | Inline-6 |
| Total Displacement | 4.2 Liters (254 cu in) |
| Bore x Stroke | 94.0 x 100.0 mm (3.70 x 3.94 in) |
| Aspiration & Charge Air | High-Boost Variable Geometry Turbocharger (VGT) with Seawater Intercooler |
| Cooling System Architecture | Tubular Heat Exchanger Closed Circuit with Integrated Gearbox Oil Cooler |
| Continuous Power Rating (P1) | 250 BHP (184 kW) @ 3,200 RPM |
| Maximum / Intermittent Power (P3/P4) | 350 BHP (257 kW) @ 3,800 RPM |
| Fuel Injection Platform | High-Pressure Common Rail (HPCR) Electronic Direct Injection |
| Cylinder Head Metallurgy | 24-Valve Cast Iron Monobloc Cylinder Head with Single Overhead Camshaft (SOHC) |
| Cylinder Liners | Heavy-Duty Cast Iron Engine Block with Integrated Parent Bores |
| Flywheel Housing & Flywheel | SAE 3 Housing with Heavy-Duty Marine Torsional Damper Plate |
| Electrical System & Ground | 12V Negative Ground Marine Electrical System (Optional 24V Isolated Ground) |
| Starter & Alternator Output | 12V 2.8 kW Electric Starter / 12V 120A Marine Alternator |
| Lube Oil Sump Capacity | 10.5 Liters (2.77 US gal) |
| Engine Coolant Capacity | 14.0 Liters (3.70 US gal) |
| Dry Weight (excl. gearbox) | 450 kg (992 lbs) |
| Overall Dimensions (L x W x H) | 1,150 x 720 x 785 mm (45.3 x 28.3 x 30.9 in) |
| Emissions Certification | RCD 2 (Directive 2013/53/EU) / EPA Tier 3 Marine / IMO Tier II |
| Fuel Compatibility | Ultra-Low Sulfur Diesel (ULSD No. 2), Marine Gas Oil (MGO DMA), Automotive Diesel (EN 590) |
| Transmission / Outdrive Compatibility | Packaged with ZF 85A / ZF 85IV Hydraulic Down-Angle Marine Transmission and Digital Shift Actuator |
| Factory Warranty Period | FNM CMD 2-Year Limited Marine Manufacturer Warranty |
| Application Research | Turn-key shaft-drive installations for pilot service launches, high-speed passenger ferries, fast search and rescue (SAR) cutters, and police patrol craft. |
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