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Commercial Propulsion Engines

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.

C9.3 Commercial Propulsion Engine

*Preliminary Information* The C9.3 ACERT propulsion engine has a B rating of 375 bhp (280 bkW) at 1800 rpm, a C rating of 416 bhp (310 bkW) at 2100 rpm, and a D rating of 476 bhp (355 bkW) at 2300 rpm. The C9.3 propulsion, auxiliary, and generator set engines have a common rail fuel system for optimal combustion and lower emissions. Cooling system options for the propulsion and auxiliary engines include heat exchanger with sea water aftercooling, and keel with combined circuit or separate circuit aftercooling. The genset packages are available with heat exchanger, keel, or radiator cooling. These products are EPA Tier 3 and IMO II certified. In addition the propulsionengine ratings are EU Stage IIIA certified and auxiliary and gen sets are also CCNR Stage II certified.

  • Specification Summary

  • Power Range 375-476 bhp (280-355 bkW)
  • Speed Range 1800-2300 rpm
  • Emissions EPA Tier 3 Commercial, IMO II, EU IW
  • Aspiration TA

Product Details

Power Rating

Power Range 375-476 bhp (280-355 bkW)

Engine Specifications

Speed Range 1800-2300 rpm
Emissions EPA Tier 3 Commercial, IMO II, EU IW
Aspiration TA
Bore 115 mm
Stroke 149 mm
Displacement 9.3 l
Rotation from Flywheel End Counterclockwise
Configuration In-line 6, 4-Stroke-Cycle Diesel

Dimensions & Weights

Width - Engine 978 mm
Height 1093 mm
Length - Engine 1452 mm
Engine Dry Weight - Approximate 945-1122 kg (2083-2474 lbs)
  • Watercooled turbocharger and exhaust manifold
    • Electronic control system
      • Thermostats and housing
        • Gear-driven sea water pump (self-priming)
          • Common rail fuel system
            • Shell and tube type jacket water heat exchanger
              • Corrosion-resistant sea water aftercooler
                • Engine oil cooler
                  • Vibration damper and guard
                    • Primary fuel filters
                      • Alternators – 24V 70, 105 amp, 12V 110 amp
                        • Closed crankcase ventilation system
                          • Transmission gear oil cooler (engine mounted for HEX)
                            • Additional engine and transmission sensor packages
                              • Instrument panels
                                • Electric starting motors – 12V or 24V
                                  • Air starting motor
                                    • Dual starting motors
                                      •  24V electric and air
                                      •  24V electric (2)
                                    • 24V electric and air
                                      • 24V electric (2)
                                        • Electric fuel priming pump
                                          • Fuel cooler
                                            • PTO Drives – V belt pulley stack, stub shaft
                                              • Duplex fuel and oil filters
                                                • Double wall fuel rail

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