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.


Low owning and operating costs with competitive pricing, longlife construction, and extended service intervals

Easy to install

Plug and play remote instrument panels

Environmentally responsible

Low emission, noise, and vibration levels; 60 Hz meets EPA Tier 2, 50 Hz meets EU 97/68EC Stage II regulations


Automatic shutdowns for overspeed, high fresh water temperature, low engine oil pressure, and high exhaust temperature (when fitted with a wet exhaust system).


Available as an open set or with sound attenuated enclosure, and with radiator-, heat exchanger-, or keel-cooled options

Excellent power quality

Suitable for sophisticated on-board equipment (computers, etc.)

Single source of supply for propulsion and generator sets

Reduced service costs and port time

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)

Additional information

Offering Type

Generator Set Specifications - Minimum Rating

36.0R ekW (45 kVA)

Generator Set Specifications - Maximum Rating

99.0 ekW (123 kVA)

Generator Set Specifications - Frequency

50 Hz or 60 Hz

Generator Set Specifications - Speed

1500 rpm or 1800 rpm

Engine Specifications - Engine Model

In-line 4, 4-Stroke-Cycle Diesel

Engine Specifications - Aspiration


Engine Specifications - Bore

105.0 mm ( 4.13 in )

Engine Specifications - Stroke

127.0 mm ( 5.0 in )

Engine Specifications - Displacement

4.4 l ( 269.0 in³ )

Engine Specifications - Governor Type


Generator Set Specifications - Emissions/Fuel Strategy

EPA Tier 2 (60 Hz), EU 97/68EC Stage II (50 Hz)

Generator Set Dimensions - Length

1750.0 mm ( 68.9 in )

Generator Set Dimensions - Width

1215.0 mm ( 47.8 in )

Generator Set Dimensions - Height

1000.0 mm ( 39.4 in )

Generator Set Dimensions - Weight

805 kg (1775 lb) – 1015 kg (2338 lb)

Generator Specifications - Excitation

Separately excited from auxiliary winding to provide 300% short circuit current up to 10 seconds

Generator Specifications - Pitch


Generator Specifications - Number of Leads

12 lead reconnectable

Generator Specifications - Insulation

Class H

Generator Specifications - IP Rating

IP23 water protection (IP44 available for certain models, contact your dealer for information)

Generator Specifications - Voltage Regulator

Solid state voltage regulator with integral voltage adjustment potentiometer

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