Product Description

The Cummins B3.9CMII64G Marine Auxiliary Engine is a compact yet powerful 3.9-liter, 4-cylinder diesel engine delivering 47 kW (63 HP) at 1500 RPM. Built with turbocharging and jacket-water aftercooling, it ensures efficient, reliable power for auxiliary marine applications.

Cummins B3.9CMII64G Marine Power Unit is engineered for durability, low operating costs, and smooth integration with marine generator sets. Ideal for vessels requiring dependable auxiliary power in a space-saving package, this model offers Cummins’ proven marine performance backed by a worldwide service network.

Key Specifications

• Engine Model: Cummins B3.9CMII64G
• Prime Power: 47 kW (63 HP) @ 1500 RPM
• Overload Power: 52 kW (69 HP) – 1 hr in 12 hrs
• Configuration: 4-stroke, 4-cylinder inline
• Displacement: 3.9 L (239 in³)
• Bore × Stroke: 102 × 120 mm (4.02 × 4.72 in)
• Compression Ratio: 17.3:1
• Aspiration: Turbocharged / Jacket Water Aftercooled (JWAC)
• Fuel System: High-Pressure Common Rail (HPCR)

• Fuel Consumption:

  • 110% Load: 13.8 L/h (3.65 gal/h)
  • 100% Load: 12.8 L/h (3.37 gal/h)
  • 75% Load: 10.2 L/h (2.70 gal/h)

  • 50% Load: 7.8 L/h (2.06 gal/h)

• Air Flow: 58–60 L/s (123–127 cfm)
• Exhaust Flow: 152–159 L/s (322–336 cfm)
• Exhaust Temperature: 503–522 °C (937–970 °F)
• Dry Weight: 425 kg (937 lbs) engine only / 516 kg (1137 lbs) with heat exchanger

Product Advantages

• Compact Footprint – Fits easily in tight engine rooms without compromising output
• Fuel-Efficient – Lower fuel consumption for cost-effective operation
• Global Support – Cummins service and parts available worldwide
• Reliable Power – Proven performance in commercial and offshore vessels

Key Features

• High torque at rated speed for stable generator performance
• Robust cooling system for extended engine life in marine environments
• Easy service access for filters and maintenance points
• Low noise and vibration for crew comfort (<93 dB at 1 m)

• 10% overload capacity for short-term heavy demand

Applications

• Auxiliary generator sets for cargo, fishing, and offshore vessels
• Power supply for navigation, lighting, and onboard systems

• Emergency backup generator for marine operations

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Each and every product manufactured is tested, inspected and is guaranteed to meet the performance specitications.