Marine Diesel Engines and Generators

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Nanni Marine Diesel Engine N4.38

37.5 hp

Kubota engine base

This Nanni Diesel 4 cylinder marine engine which incorporates the latest Kubota innovations, is particularly well suited for displacement vessels and sailing yachts.


Nanni Diesel has forged a strong partnership with Kubota. Kubota engines are known for their robust design and ensure great reliability and excellent longevity.

Environmental-Tri Vortex Combustion System (E-TVCS)

The N4.38 is equipped with the E-TVCS combustion and injection system which considerably reduces particulate emission and smoke while dramatically improving fuel efficiency. This engine is easy to maintain due to timing gears rather than belt and easy access to the principal parts. For these reasons the N4.38 has become the choice of many boat builders who integrate this engine into their series production race and cruising yachts.


A special coating of the pistons with molybdenum lowers friction and reduces engine vibrations resulting in supplementary comfort concerning the sound levels. Optional equipment such as different instrument panels, engine wiring, bipolar wiring etc. makes it suitable for numerous types of boats, no matter if they are made out of wood, fibreglass, aluminium or steel.

Light and reliable

Its power to weight ratio and its reliability have convinced the skippers participating in the gruel non-stop around the world “Vendée Globe” race. You do not have to sail around the world yourself to judge. The N4.38 will work discretely and will afford you the benefit of navigating in all serenity while you are out on the open sea.

Protecting the environment

The N4.38 complies with the most stringent emission regulations in the world: EU-RCD, US-EPA, BSO

Technical Specifications

  • Engine Base: Kubota
  • Rated Power (kW/HP): 27.6 / 37.5
  • Rated RPM: 3000
  • Displacement (cm³/in³): 1498 / 91
  • Number of Cyliners: 4 in line
  • Bore and Stroke (mm/in): 78 x 78.4 / 3.07 x 3.09
  • Compression Ratio: 23:1
  • Intake: Naturally Aspirated

Engine Specifications

  • Dry Weight with Transmission (kg/lb): 184 / 405
  • Maximum Install Angle: 15° (dynamic)
  • Exhaust Hose Diameter (mm/in): 60 / 1.57
  • Fuel Hose Diameter (mm/in): 8 / 0.31
  • Sea Water Hose Diameter (mm/in): 25 / 1
  • Transmission: Mechanical Shaft
  • Cooling: Closed with Heat Exchanger
  • Certifications: EPA, BSO, SAV, EU-RCD

Standard Equipment

  • Fresh Water Cooled Exhaust Manifold
  • Exhaust Elbow
  • 4m Electrical Extension Harness
  • Fuel Filter
  • Oil Filter
  • Mecanical Gearbox
  • Sea Water Pump

Optional Equipment

  • Keel Cooling Adaptation
  • Complete Propulsion Kit
  • Thottle and Shift Controls
  • Flybridge Panel and Extension Harness
  • Bi-Pole Electrical System
  • Water Boiler System
  • Complete Fuel System
  • Complete Exhaust System