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Cat® C4.4 Marine Generator Set

Cat® C4.4 Diesel Marine Generator Set has three phase ratings of 50 Hertz at 38.0, 51.5, and 69.0 ekW with heat exchanger cooling and at 36.0, 49.0, and 65.0 ekW with radiator cooling that meet EU CCNR2 emissions standards. The C4.4 also has three phase ratings of 60 Hertz at 44.0, 58.5, 76.0, and 99.0 ekW with heat exchanger cooling and of 42.0, 56.0, 72.0, and 95.0 ekW with radiator cooling. C4.4 gen set is available in 12 or 24 volt as an open gen set or as an enclosed package. Single-side servicing improves ease of maintenance and lowers overall owner operating costs. The compact package size is ideal for a wide range of commercial and pleasure craft applications. These ratings also have Marine Classification Society approved packages available.




  • Generator Set Specifications
    Spec Value
    Minimum Rating 36.0R ekW (45 kVA)
    Maximum Rating 99.0 ekW (123 kVA)
    Frequency 50 Hz or 60 Hz
    Speed 1500 rpm or 1800 rpm
    Emissions/Fuel Strategy EPA Tier 2 (60 Hz), EU 97/68EC Stage II (50 Hz)
  • Engine Specifications
    Spec Value
    Engine Model In-line 4, 4-Stroke-Cycle Diesel
    Aspiration NA, T, TA
    Bore 4.13 in
    Stroke 5 in
    Displacement 269 in³
    Governor Type Electronic
  • Generator Set Dimensions
    Spec Value
    Length 68.9 in
    Width 47.8 in
    Height 39.4 in
    Weight 805 kg (1775 lb) - 1015 kg (2338 lb)
  • Generator Specifications
    Spec Value
    Excitation Separately excited from auxiliary winding to provide 300% short circuit current up to 10 seconds
    Pitch 2/3
    Number of Leads 12 lead reconnectable
    Insulation Class H
    IP Rating IP23 water protection (IP44 available for certain models, contact your dealer for information)
    Voltage Regulator Solid state voltage regulator with integral voltage adjustment potentiometer

Standard Equipment

Air Inlet System

  • Air cleaner, single element canister type w/ service indicator and rain cap
  • Dry insulated turbocharger (DIT and DITA models only)
  • Glowplug cold start system

Cooling System

  • Heat exchanger cooled packages w/ Cupro-nickel tube bundle (sized for 50 o C ambient air and 32 o C sea water) or Keel cooled packages (sized for 50 o C ambient air)
  • De-aeration expansion tank
  • Plate-type engine oil cooler
  • Gear driven centrifugal jacket water pump
  • Gear driven self priming sea water pump
  • Caterpillar Extended Life Coolant (heat exchanger cooled packages)

Exhaust System

  • Dry insulated turbocharger
  • Water-cooled exhaust manifolds

Fuel System

  • Primary fuel filter / water separator w/ NPT and BSP connectors (ship loose)
  • Secondary fuel filter (LH)
  • Fuel priming pump electric
  • Energize to run shutoff solenoid


  • 12 lead reconnectable
  • 3 phase all models
  • Brushless
  • Separately excited from auxiliary winding to provide 300% short circuit current up to 10 seconds
  • 2/3 pitch
  • Broad voltage band
  • IP23 water protection
  • Solid state voltage regulator w/ integral voltage adjustment potentiometer
  • Class H insulation
  • Connection poles

Lube System

  • Lubricating oil
  • Oil filter (LH)
  • Dipstick (LH)
  • Fumes disposal (closed system)

Mounting System

  • Steel base frame with drip pan
  • Anti-vibration mounts

Starting/Charging System

  • Negative isolated ground electric system


  • Single side service (LH)
  • Keel cooled gensets do not include the keel cooler(s)

Optional Equipment

Space heater kit

  • 240V AC, 120V AC