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The 9CM25C generator set brings to the offshore industry a legacy of proven reliability and durability in the marine industry. CM offshore generator sets feature standard modular designs, engine-mounted pumps and filters, and a full range of factory attachments that make their installation simple and efficient. Ideal applications for the 9CM25C offshore generator sets are main power on-board production vessels and platforms. Complete package offerings are MCS type-approved and compliant with IMO Tier II emissions standards, making their integration into vessels and platforms a simplified operation. Cat generator sets are backed by the worldwide network of Cat dealers ready to support your operation with technical support, service, parts, and warranty.

Engine Specifications

  • Minimum Rating 3600.0 kV·A 2880.0 ekW
  • Maximum Rating 3600.0 kV·A 2880.0 ekW
  • Emissions IMO Tier II IMO Tier II
  • Aspiration Turbocharged-Aftercooled Turbocharged-Aftercooled
  • Bore 10.0 in 255.0 mm
  • Displacement 11204.0 in³ 184.0 l
  • Engine Control Electronic Electronic
  • Generator Set Control Electronic Electronic
  • Stroke 15.7 in 400.0 mm
  • Weight 123459.0 lb 56000.0 kg


  • Height 174.7 in 4437.0 mm
  • Length 374.6 in 9516.0 mm
  • Width 99.8 in 2534.0 mm

Engine Design

- World-class reliability and durability - Incorporates years of proven component reliability and - durability in marine industry - Medium speed long-stroke engine design - Ideal configuration for dynamically positioned semisubmersible rigs and drillships - Compact cylinder head design - Nodular cast-iron block with integrated ducts for lubricating oil and charge air - Segmental camshaft design - 25° tilt capability in all directions - Engine design based on the higher requirements of heavy fuel oil - High efficiency turbocharger - Cylinder liner, only cooled outside the engine block - Engine control terminal with analog instrumentation in robust cast casing - Connecting rod, oblique split design - Compact module for lower valve drives and injection pump drives with cam followers - Flexible Camshaft Technology (FCT)

Ease of Installation

- Standard modular design allows for ease of installation and reduced complexity - Installation-friendly, due to pumps and filters installed on the engine n Cooling water system with simple plug-in connections - Full range of factory-installed engine attachments allows customization and reduction in installation time

Packaging Concept

- Assembled, tested, and validated as a package to minimize package vibration and maximize component life

Improved Serviceability

- Large inspection openings allow for convenient access to core engine internals for easier serviceability - Core engine components designed for reconditioning and reuse at overhaul - Worldwide dealer network with factory-trained technicians means that parts and support are never out of reach - Simplified parts spectrum by using single-pipe exhaust gas ducting

Web Site

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9CM25C Standard Equipment


  • Motor-driven barring gear, fitted on engine
  • Reversing contractor and pushbutton switch with cable
  • Electronic speed setting equipment with actuator and speed pick-up
  • Emergency shutdown equipment with pushbutton, separate, for manual emergency stop

Engine Indicators

  • Gauge board with set liquid damped pressure gauges for: fuel, lubricating oil, fresh water, starting air, and charge air.
  • On-engine thermometers for fuel, lubricating oil, fresh water, and charge air
  • Electric remote speed indicator
  • Turbocharger and remote speed indicator
  • Exhaust gas temperature indicator


  • Manual control on engine, including: control panel with start /stop key, speed setting device, mechanical shutdown device, change over of control functions from engine to remote control
  • Starting solenoid valve on engine, 24 V DC
  • Separate electronic speed governor

Monitoring for Unattended Operation

  • Pressure switches, mounted on engine, for: - Lube oil pressure at full load below danger level - Low lube oil pressure - Lube oil pressure below danger level - Lube oil pressure prelubrication failed - Low fresh water pressure at engine inlet - Fresh wate

Starting Air System

  • Separate non-return valve for the starting air pipe to the engine

Air Intake System

  • Air intake filter, fitted on the turbocharger
  • Air bottles, separate

Diesel Oil System

  • Separate circulating pump driven by electric motor, horizontal or vertical
  • Duplex filter with differential pressure indication

Exhaust System

  • Turbocharger at free end with transition nozzle (0 degrees from the vertical and away from engine), with compressor cleaning device
  • Expansion joint separate
  • Separate silencer and spark arrester, unlagged 35 dB(A)

Fresh Cooling Water System

  • HT pump, fitted on engine
  • LT pump, separate, vertical design, electric motor driven
  • HT thermostat, not powered and separate
  • Engine preheating equipment, fitted on base frame

Lubricating Oil System

  • Plate cooler, fitted on engine
  • Force pump, fitted on engine
  • Prelubrication pump, fitted on base frame, electric motor driven
  • Boll and Kirch automatic backflushing filter, separate
  • Duplex filter with differential pressure indication, separate
  • Pressure control valve, separate
  • Thermostat, not powered, separate

Connecting Parts - Engine

  • Set of connecting parts between flange coupling and flywheel
  • Flexible flange coupling between engine and generator
  • Base frame with flywheel guard and incorporating lube oil sump tank, for engine and generator
  • Mounting of engine and generator on the base frame
  • Set of bonded rubber rails for resilient mounting of the base frame
  • Set of flexible pipe connections


  • Set of tools for turbocharger
  • Set of tools for turbocharger
  • Inside micrometer for cylinder liners
  • Ruler for cylinder liner

Spare Parts

  • Set of engine spare parts for unrestricted operation
  • Set of spare flexible pipe connections

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