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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 C Marine Propulsion Engine

The M 25 C, part of the MaK long-stroke engine generation, is based on the proven design characteristics of the M 20 C, M 32 C and M 43 C engine series. When developing this new engine generation, the objective was to achieve a high benefit level for the customer. In all design and development considerations, therefore, three criteria had the highest priority: reliability, economy and environmental compatibility. Other points of significance in the engine’s design and development work were ease of maintenance, long maintenance intervals, long component life and ease of installation.

  • Specification Summary

  • Power Range1740-3000 kW
  • Speed Range720-750 rpm
  • EmissionsIMO II
  • AspirationTurbocharged
  • Bore255 mm
  • Specification Sheet


Product Details

Power Rating

Power Range 1740-3000 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 5345 mm
Maximum Length 6719 mm
Minimum Height 3387 mm
Maximum Height 3769 mm
Minimum Width 2237 mm
Maximum Width 2291 mm
  • Air Inlet System
    •  Air intake silencer / filter
  • Air intake silencer / filter
    • Control System
      •  Load sharing unit (for multiple engine plant only)
      •  Protection panel (emergency stop, override, reset push buttons)
      •  Protection system
      •  Serial link interface (MODbus / canbus)
      •  Speed governor
      •  Start / stop panel
    • Load sharing unit (for multiple engine plant only)
      • Protection panel (emergency stop, override, reset push buttons)
        • Protection system
          • Serial link interface (MODbus / canbus)
            • Speed governor
              • Start / stop panel
                • Cooling System
                  •  2-stage charge air cooler
                  •  Electronic cooling water preheater
                  •  HT cooling water pump (engine driven)
                • 2-stage charge air cooler
                  • Electronic cooling water preheater
                    • HT cooling water pump (engine driven)
                      • 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)
                      • Instrumentation
                        •  Control push buttons and lamps
                        •  Emergency stop lever
                        •  Local control panel
                        •  Pressure and temperature indicator
                      • Control push buttons and lamps
                        • Emergency stop lever
                          • 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
                              • 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
                                        • 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
                                            • Control System
                                              •  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
                                            • 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
                                                        • 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
                                                                    • 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
                                                                    • 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
                                                                                    • Flexible pipe connections
                                                                                      • Resilient mounting
                                                                                        • Starting System
                                                                                          •  Starting air compressor
                                                                                          •  Starting air receiver
                                                                                        • General
                                                                                          •  Cat Propulsion Systems
                                                                                          •  Engine PTO coupling
                                                                                          •  PTO alternator
                                                                                          •  PTO shaft on counter-flywheel side
                                                                                          •  Reduction gear
                                                                                          •  Reduction gear PTO coupling
                                                                                        • Cat Propulsion Systems
                                                                                          • Engine PTO coupling
                                                                                            • PTO alternator
                                                                                              • PTO shaft on counter-flywheel side
                                                                                                • Reduction gear
                                                                                                  • Reduction gear PTO coupling

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