M 25 E

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Designed for a high power output, the M 25 E is not only the right choice for customers seeking power density and increased load response capabilities, but also for those who choose to lower operational fuel costs utilizing selected load profiles in combination with the most efficient engine speed.

Generator Set Specifications

  • Minimum Rating 2016 kWe (2625 kVA) 2016 kWe (2625 kVA)
  • Maximum Rating 3024 kWe (3938 kVA) 3024 kWe (3938 kVA)
  • Emissions/Fuel Strategy IMO II IMO II

Engine Specifications

  • Configuration 6,8,9 Cylinder 6,8,9 Cylinder
  • Bore 10.0 in 255.0 mm
  • Stroke 15.75 in 400.0 mm
  • Swept Volume 1244.88 in³ 20.4 l/cyl

Generator Set Dimensions

  • Weight 43.0 - 56.0 t (94798 - 123459 lbs) 43.0 - 56.0 t (94798 - 123459 lbs)
  • Length 7717 - 8713 mm (303.8 - 343.0 in) 7717 - 8713 mm (303.8 - 343.0 in)
  • Width 2357 mm (92.8 in) 2357 mm (92.8 in)
  • Height 3866 - 4066 mm (152.2 - 160.1 in) 3866 - 4066 mm (152.2 - 160.1 in)

Intelligent simplicity

This MaK design principles is most clearly reflected in the reduction of the number of components. About 40 % of parts have been dispended. It has resulted in a market gain in operational and a reduction of operating costs.

Reliable energy supply

The complete diesel generator set is notable for its ease of installation, reliable operation, ease of maintenance and provides good component accessibility.

Ready for installation

In addition to many outstanding technical features, the long-stroke M 25 E engine is also easy to install and provides good maintenance access to all components.

Complete propulsion system

The supply of complete propulsion systems is a market requirement which is becoming increasingly important.

System responsibility and supply from a single source, accurately matched interfaces and coordinated delivery data control

M 25 E Standard Equipment

Air Inlet System

  • Air intake silencer / filter

Control System

  • Load sharing unit (for multiple engine plant only)
  • Modular Alarm Control and Protection System (MACS)
  • Speed governor

Cooling System

  • Electric 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 counter-flywheel end

Fuel System

  • Fuel circulating pump (attached / for MDO/MGO only)
  • Fuel indicator filter
  • Fuel pressure valve (fitted / for MDO/MGO only)


  • Control push buttons and lamps
  • Local control panel
  • Pressure and temperature indicator

Lube System

  • Lube oil cooler (separate)
  • Lube oil pump (engine driven)
  • Lube oil self-cleaning filter
  • Oil sump in base frame
  • Pre-lubricating oil pump (electric driven / fitted on base frame)
  • Pressure regulating valve

Mounting System

  • Flexible pipe connections
  • High flexible coupling
  • Resilient mounting

Starting System

  • Electrical barring device
  • Starting air valve


  • Engine, flexible coupling and generator mounted on a common base frame
  • Flywheel cover
  • Lifting device (rental)
  • Torsional Vibration Calculation (TVC)

M 25 E Optional Equipment

Air Inlet System

  • 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 indicators (start air pressure, engine speed, etc.)
  • Starter for electric driven pumps
  • 24 DC UPS

Cooling System

  • CW piping for generator cooling on base frame
  • CW piping for lubricating oil cooler on base frame
  • FW/SW plate cooler
  • HT cooling water pump (electric driven)
  • HT temperature control valve fitted on base frame
  • LT cooling water pump (electric driven)
  • Sea water cooling pump (electric driven)
  • Temperature control valve

Exhaust System

  • Silencer (with spark arrester)

Fuel System

  • Fuel oil cooler
  • HFO final preheater
  • HFO pressure regulating valve
  • HFO self-cleaning automatic filter
  • HFO supply and booster pumps (electric driven)
  • HFO treatment and supply modules
  • HFO viscosity control device
  • Mixing tank

Lube System

  • Lube oil centrifuge
  • Lube oil pump (electric driven)
  • Lube oil treatment and combined modules
  • Temperature control valve
  • Temperature control valve fitted on base frame

Mounting System

  • Double resilient mounting (engine and base frame)

Starting System

  • Starting air compressor
  • Starting air receiver


  • Engine PTO coupling
  • Generator customer supply
  • Part Load Optimization Kit for constant speed engine (SFOC improvement, smoke reduction)
  • Part Load Optimization Kit for variable speed engine (massive SFOC improvement,...)
  • PRO shaft on counter-flywheel side

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