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Marine Generator Sets

Industry-leading technology allows Caterpillar to create the most reliable commercial engines for a variety of applications. From tugs and container vessels to yachts and sport fishers, Cat and MaK engines have demonstrated their efficiency countless times. With remarkable reliability and durability, these engines will exceed your expectations for decades.

Cat® C4.4 ACERT Marine Generator Set

The C4.4 ACERT marine genset packages with heat exchanger or keel cooling are available with 60 Hz ratings of 60, 75, 99, 118 ekW and 50 Hz ratings of 65, 80, 99 ekW. Radiator cooled gen sets are with 60 Hz ratings of 51, 66, 90, and 105 ekW and 50 Hz ratings of 58, 73, and 88 ekW. The C4.4 ACERT meets U.S. EPA Tier 3 and EU CCNR Stage II emissions regulations. The C4.4 ACERT is electronically controlled with a Common Rail fuel system.

  • Specification Summary

  • Minimum Rating 58R ekW (50 Hz), 51R ekW (60 Hz)
  • Maximum Rating 88R ekW (50 Hz), 105R ekW (60 Hz)
  • Frequency 50 Hz or 60 Hz
  • Speed 1500 rpm or 1800 rpm
  • Specification Sheet

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Product Details

Generator Set Specifications

Minimum Rating 58R ekW (50 Hz), 51R ekW (60 Hz)
Maximum Rating 88R ekW (50 Hz), 105R ekW (60 Hz)
Frequency 50 Hz or 60 Hz
Speed 1500 rpm or 1800 rpm

Generator Set Configurations

Emissions U.S. EPA Tier 3 / CCNR Stage 2

Engine Specifications

Configuration I-4, 4-Stroke-Cycle-Diesel
Aspiration TA
Bore 105.0 mm
Stroke 127.0 mm
Displacement 4.4 L
Governor Type Electronic

Generator Specifications

Excitation AREP
Pitch 2/3
Number of leads 12-lead reconnectable
Insulation Class H
IP Rating IP23
Voltage regulator ±0.5%

Generator Set Dimensions

Width 37.6 inches (radiator - 38.8 inches)
Height 2518-2844 lb (1141-1290 kg), 3389R lb (1537R kg)
Length 66.9-69.6 in (1699-1769 mm), 80.2R in (2037R mm)
Height 2518-2844 lb (1142 - 1290 kg)
  • Air Inlet System
    •  Open Crankcase Ventilation (OCV) system
    •  Turbocharger, jacket water cooled
    •  Integrated coolant lines into manifold utilizing EGR circuit
  • Cooling System
    •  Integrated heat exchanger and aftercooler
    •  Compact design integral coolant passages
    •  Thermostat and housing
    •  Jacket Water Heater 120/240V option
    •  Auxiliary seawater pump, gear driven
    •  Engine mounted heat exchanger, removable tubeBundle (for sea water) (heat exchanger engines only)
    •  Engine oil cooler
    •  Auxiliary sea water lines
    •  Keel cooling
  • Integrated heat exchanger and aftercooler
    • Compact design integral coolant passages
      • Thermostat and housing
        • Jacket Water Heater 120/240V option
          • Auxiliary seawater pump, gear driven
            • Engine mounted heat exchanger, removable tubeBundle (for sea water) (heat exchanger engines only)
              • Engine oil cooler
                • Auxiliary sea water lines
                  • Keel cooling
                    • Exhaust System
                      •  Dry insulated turbocharger
                      •  Water-cooled exhaust manifolds
                      •  102 mm (4 in) round flanged outlet
                      •  Dry Elbow/Bellows/Flange options
                    • Fuel System
                      •  Common Rail Fuel System
                      •  Simplex and Duplex Fuel options
                      •  Flexible fuel line option
                      •  Fuel transfer pump, gear driven
                    • Common Rail Fuel System
                      • Simplex and Duplex Fuel options
                        • Flexible fuel line option
                          • Fuel transfer pump, gear driven
                            • Generator
                              •  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
                              •  Class H insulation
                              •  Generator winding temperature rise meets marine society requirements.
                            • Governing System
                              •  Electronic governor
                              •  Electronic
                            • Lube System
                              •  Lubricating oil
                              •  Oil filter, RH Service
                              •  Simplex and Duplex options
                              •  Crankcase breather
                              •  Oil filler, in valve cover and timing case (option)
                              •  Oil level gauge, RH service
                              •  Oil pan
                              •  Oil pan drain, RH
                              •  Engine oil pump (gear driven)
                            • Mounting System
                              •  Formed C-channel rails
                              •  Anti vibration isolators between base and engine-generator
                            • Formed C-channel rails
                              • Anti vibration isolators between base and engine-generator
                                • General
                                  •  Single side service (LH)
                                  •  Keel cooled gensets do not include the keel cooler(s)
                                • Single side service (LH)
                                  • Keel cooled gensets do not include the keel cooler(s)
                                    • Control System
                                      •  Panels available in RH, LH, and rear configurations with a remote mount option
                                      •  Electronic diagnostics and fault logging
                                      •  Electronic governor
                                      •  Electronic Control Module (ECM)
                                      •  SAE J1939 data link Ratings Only
                                      •  Electronic fuel/air ratio control
                                    • Flywheels & Flywheel Housings
                                      •  Flywheel Housing, SAE No. 3
                                      •  Flywheel, 126 teeth
                                      •  SAE standard rotation
                                    • Flywheel Housing, SAE No. 3
                                      • Flywheel, 126 teeth
                                        • SAE standard rotation
                                          • Power Take-Offs
                                            •  Multi-V groove for alternator drive
                                            •  PTO Shaft Kit (optional)
                                          • Multi-V groove for alternator drive
                                            • PTO Shaft Kit (optional)
                                              • General
                                                •  Lifting eyes
                                                •  Protective lifting covers
                                                •  Battery disconnect switch
                                                •  Note: Keel-cooled gen sets do not include the keel cooler(s).
                                              • Lifting eyes
                                                • Protective lifting covers
                                                  • Battery disconnect switch
                                                    • Note: Keel-cooled gen sets do not include the keel cooler(s).
                                                      • Coolant Recovery Tank
                                                        • Keel Cooled Expansion Tank
                                                          • Sea Water Pump Connections
                                                            • High Level Dipstick
                                                              • Governor droop kit (enables paralleling with appropriate customer supplied switchgear)
                                                                • Mid-Level Oil Filler
                                                                  • Power Take-Offs
                                                                    •  Crankshaft Pulley - Crankshaft PTO Shaft, Engine Turning Device
                                                                  • Crankshaft Pulley - Crankshaft PTO Shaft, Engine Turning Device
                                                                    • Special Tests/Reports
                                                                      •  Test Certificate at Rated PWR
                                                                    • Test Certificate at Rated PWR
                                                                      • Generators and Generator Attachments
                                                                        •  110V Anti-Condensation Heater
                                                                        •  230V Anti-Condensation Heater
                                                                      • Jacket Water Heater
                                                                        • Exhaust System
                                                                          •  Dry Elbow
                                                                          •  Dry Flange
                                                                          •  Dry Elbow and Bellows
                                                                        • Dry Elbow
                                                                          • Dry Flange
                                                                            • Dry Elbow and Bellows
                                                                              Built for it