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M 25 C propulsion

The in 1996 introduced M25 engine, having a bore of 255 mm and a stoke of 400 mm, is the second smallest MaK engine of the engine programme. This type is available as an inline version with 6, 8 and 9 cylinders. The output ranges from 1,800 kW (6M25C) to 3,000 kW (9M25C) at 720 and 750 revolutions per minute.

For more information about the M25 download following documents or visit www.marine.cat.com.

Quick Facts

  • kW
    1800 - 3000
  • rpm
    720 - 750
  • bore
  • stroke
  • g/kW
    183 - 184

Dimensions and weight

Engine centre distance:
26 M 25 C 2600 mm
8,9 M 25 C 2700 mm
Removal of cylinder liner:
in transverse direction: 2510 mm
in longitudinal direction: 2735 mm

Nozzle position: ask for availability
Engine with turbochanger at free end available, ask for dimensions

Design Features

Crankshaft with thrust bearing

Generously sized trunnions capable of bearing the single-part gearwheel for the control drive.


The camshaft is, as built, equipped with vibration dampers.

Cylinder liner with calibration ring

Robust cylinder liner protected from wear that has longer oil change intervals thanks to reduced dirt intake.

Multifunctional cooling water ring

Cooling water ring catering action during assembly of cylinder liner and head and protects cylinder head bolts from corrosion.



First ring with chromium ceramic-plated running surface

High-efficiency turbocharger

Corrosion-free turbocharger with low temperature level of components surrounding the combustion chamber.

Cylinder head

Complex component in nodular cast iron, stiffness from twin-bottom design.

Injection Pumps

Injection Pumps

Monobloc designed injection pumps with constant-pressure valve and integrated low-pressure damping preventing high pressure pulses.