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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.

M 25 E Marine Propulsion Engine

The new M 25 E has been designed to completely meet the ultimate customer requirements, providing the lowest cost of operation while maintaining the highest uptime in the industry. Since one engine standard typically does not fit all applications, different M 25 E configurations will be available to support various application-specific requirements. Based on the proven M 25 C, all versions have been extensively optimized for best fuel consumption and load acceptance, leading reliability and durability, and efficient Selective Catalytic Reduction (SCR) operation. The service and maintenance-friendly design, remote condition monitoring and diagnostic capabilities, as well as our unmatched global product support, respond to the industry’s desire to lower operational costs and down times beyond today’s standards.

  • Specification Summary

  • Power Range2100-3150 kW
  • Speed Range720-750 rpm
  • EmissionsIMO II
  • AspirationTurbocharged
  • Bore255 mm
  • Specification Sheet


Product Details

Power Rating

Power Range 2100-3150 kW

Engine Specifications

Speed Range 720-750 rpm
Emissions IMO II
Aspiration Turbocharged
Bore 255 mm
Stroke 400 mm
Displacement 20.4 L
Rotation (from flywheel end) Counterclockwise/Clockwise
Configuration Inline 6,8,9 Cylinder

Dimensions & Weights

Minimum Dry Weight 21.2 kg
Minimum Length 4840 mm
Maximum Length 6130 mm
Minimum Height 3386 mm
Maximum Height 3861 mm
Minimum Width 2080 mm
Maximum Width 2230 mm
  • Air Inlet System
    •  Air intake silencer / filter
  • Control System
    •  Load sharing unit (for multiple engine plant only)
    •  Modular alarm control and protection system (MACS)
    •  Serial link interface (MODbus / canbus)
    •  Speed governor
  • Cooling System
    •  Electrical cooling water preheater
    •  HT cooling water pump (engine driven)
    •  2-stage charge air cooler
  • Electrical cooling water preheater
    • HT cooling water pump (engine driven)
      • 2-stage charge air cooler
        • Exhaust System
          •  Exhaust gas expansion joint
          •  Exhaust gas insulated manifolds
          •  Turbocharger at flywheel end
        • Fuel System
          •  Fuel circulating pump (attached / MGO/MDO only)
          •  Fuel indicator filter
          •  Fuel pressure valve (attached / MGO/MDO only)
        • Fuel circulating pump (attached / MGO/MDO only)
          • Fuel indicator filter
            • Fuel pressure valve (attached / MGO/MDO only)
              • Instrumentation
                •  Local control panel
                •  Pressure and temperature indicator
              • Lube System
                •  Dry sump
                •  Lube oil plate cooler (separate)
                •  Lube oil pump (engine driven)
                •  Lube oil self-cleaning filter
                •  Pressure regulating valve
              • Mounting System
                •  High flexible coupling
                •  Rigid mounting
              • Starting System
                •  Electrical barring device
                •  Starting air valve
              • General
                •  Lifting device (rental)
                •  Torsional Vibration Calculation (TVC)
              • Air Inlet System
                •  Air inlet shut-off valve
                •  Air intake transition piece
                •  Expansion joint
                •  Silencer / filter
              • Air inlet shut-off valve
                • Air intake transition piece
                  • Expansion joint
                    • Silencer / filter
                      • Control System
                        •  Air injection control (for better load acceptance)
                        •  Electronic speed governor
                        •  Engine alarm system
                        •  Remote control system
                        •  Remote indicators (start air pressure, engine speed, etc.)
                        •  Starter for electric driven pumps
                        •  24 DC UPS
                      • Air injection control (for better load acceptance)
                        • Electronic speed governor
                          • Engine alarm system
                            • Remote control system
                              • Remote indicators (start air pressure, engine speed, etc.)
                                • Starter for electric driven pumps
                                  • 24 DC UPS
                                    • Cooling System
                                      •  FW/SW plate cooler
                                      •  HT cooling water pump (electric driven)
                                      •  LT cooling water pump (electric driven)
                                      •  Sea water cooling pump (electric driven)
                                      •  Steam / thermal oil cooling water preheater
                                      •  Temperature control valve
                                    • Exhaust System
                                      •  Silencer (with or without spark arrester)
                                      •  Turbocharger at counter-flywheel side
                                    • Silencer (with or without spark arrester)
                                      • Turbocharger at counter-flywheel side
                                        • Fuel System
                                          •  Fuel oil cooler
                                          •  HFO final preheater
                                          •  HFO pressure regulating valve
                                          •  HFO self-cleaning automatic filter
                                          •  HFO supply and booster pumps (electrical driven)
                                          •  HFO treatment and supply modules
                                          •  HFO viscosity control device
                                          •  Mixing tank
                                        • Lube System
                                          •  Lube oil centrifuge
                                          •  Lube oil pump (electrical driven)
                                          •  Lube oil treatment and combined modules
                                          •  Pre-lubricating oil pump (electrical driven)
                                          •  Temperature control valve
                                          •  Wet sump with dip stick
                                        • Mounting System
                                          •  Flexible pipe connections
                                          •  Resilient mounting
                                        • Starting System
                                          •  Starting air compressor
                                          •  Starting air receiver
                                        • Starting air compressor
                                          • Starting air receiver
                                            • General
                                              •  Cat Propulsion Systems
                                              •  Engine PTO coupling
                                              •  Part load optimzation kit for constant speed engine (SFOC improvement, smoke reduction,...)
                                              •  Part load optimization kit for variable speed engine (massive SFOC improvement,...)
                                              •  PTO alternator
                                              •  PTO shaft on counter-flywheel side
                                              •  Reduction gear
                                              •  Reduction gear PTO coupling

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