M 25 C Marine Propulsion Engine

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.

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Power Rating

Power Range
1740-3000 kW

Engine Specifications

Speed Range
720-750 rpm
Swept volume
Rotation (from flywheel end)
Inline 6,8,9 Cylinder

Dimensions & Weights

Minimum Dry Weight
Minimum Length
Maximum Length
Minimum Height
Maximum Height
Minimum Width
Maximum Width

Standard Equipment

  • Air Inlet System
    • 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
  • Cooling System
    • 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
  • 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)

Optional Equipment

  • 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
  • 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
  • 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
  • General
    • Cat Propulsion Systems
    • Engine PTO coupling
    • PTO alternator
    • PTO shaft on counter-flywheel side
    • Reduction gear
    • Reduction gear PTO coupling