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Auxiliary 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.

Cat C18 Auxiliary/Generator Set Engine (IMO II)

C18 ACERT auxiliary/generator set engines incorporate a separate circuit aftercooling system (SCAC) for all configurations. The primary advantage of the SCAC systsem is reduced aftercooler corrosion since no sea water circulates through the aftercooler. Many other improvements on these engines also contribute to minimizing owning and operating costs. The IMO II compliant ratings are available with heat exchanger or keel cooled options. All major MCS type approvals are available from the factory.

  • Specification Summary

  • Minimum Rating 301 bkW
  • Maximum Rating 492 bkW
  • Aspiration TA, TTA
  • Stroke 183 mm
  • Specification Sheet

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Product Details

Power Rating

Minimum Rating 301 bkW
Maximum Rating 492 bkW

Engine Specifications

Aspiration TA, TTA
Rotation (from flywheel end) Counterclockwise
Displacement 18.1 L
Bore 145 mm
Configuration In-Line 6, 4-Stroke-Cycle Diesel
Stroke 183 mm

Dimensions & Weights

Minimum Dry Weight 4299 kg
Maximum Dry Weight 4299 kg
Minimum Length 1854 mm
Maximum Width 1134 mm
Minimum Height 1300 mm
Maximum Height 1300 mm
Minimum Width 1134 mm
Maximum Length 1854 mm
  • AIR INLET SYSTEM
    •  Separate circuit after-cooled (SCAC)
    •  Open Crankcase Ventilation (OCV) system
    •  Turbocharger, jacket water cooled
    •  Turbocharger inlet, 152 mm (6 in) OD straight connection
  • CONTROL SYSTEM
    •  Programmable low idle
    •  Electronic diagnostics and fault logging
    •  Electronic fuel/air ratio control
    •  Engine Protection Mode for extended ambient conditions - EPA Tier 3 Ratings Only
    •  70-pin customer connector
    •  Three types of throttle inputs (primary/ secondary PWM, 0-5V, 4-20mA
  • COOLING SYSTEM
    •  Separate Circuit After-Cooling (SCAC) for both HEX and Keel cooled engines
    •  Engine JW and SCAC Shell & Tube Heat Exchangers for HEX cooled engines
    •  SCAC pump, gear driven, for HEX cooled engines only
    •  Jacket water pump, gear driven
    •  Auxiliary water pump, gear driven
    •  Sea water pump, bronze impeller, gear driven
    •  SCAC and JW shunt tanks for maintaining proper pump inlet pressures
  • EXHAUST SYSTEM
    •  152 mm (6 in) round flanged outlet
    •  Water-cooled exhaust manifold & turbocharger
  • FLYWHEELS & FLYWHEEL HOUSINGS
    •  Flywheel Housing, SAE No. 0
    •  Flywheel, 18 inch, 136 teeth
    •  SAE standard rotation
  • FUEL SYSTEM
    •  Front service simplex fuel system
    •  Fuel transfer pump, gear driven
    •  Manual fuel priming pump
    •  Hybrid fuel line design
  • Front service simplex fuel system
    • Fuel transfer pump, gear driven
      • Manual fuel priming pump
        • Hybrid fuel line design
          • LUBE SYSTEM
            •  Front service simplex oil system
            •  Center sump oil pan:
            •  Front and top service oil filler locations
            •  Front service dipstick
            •  Oil pump, gear driven
          • Front service simplex oil system
            • Center sump oil pan:
              • Front and top service oil filler locations
                • Front service dipstick
                  • Oil pump, gear driven
                    • MOUNTING SYSTEM
                      •  Front support - adjustable
                    • POWER TAKE-OFFS
                      •  Hydraulic Pump Drive
                      •  Crankshaft Pulleys
                      •  Front Stub Shaft
                      •  Front Enclosed Clutch
                    • Hydraulic Pump Drive
                      • Crankshaft Pulleys
                        • Front Stub Shaft
                          • Front Enclosed Clutch
                            • GENERAL
                              •  Front damper guard
                              •  Front service engine
                              •  Common electrical bonding point
                              •  Engine does not ship with zinc components
                              •  NOTE: These engines are for constant speed generator set applications only, and NOT to be used for variable speed applications
                            • EXHAUST SYSTEM
                              •  Dry Elbows
                              •  Water-Cooled Elbows
                              •  Flexible Fitting
                              •  Flange
                              •  Muffler
                              •  Muffler Spark Arresting
                            • AIR INLET SYSTEM
                              •  Air Inlet Adapter
                            • CHARGING SYSTEM
                              •  Battery Chargers
                              •  Charging Alternators
                              •  Alternator Mounting Group
                              •  Ammeter
                            • CONTROL SYSTEM
                              •  MECP I - Marine Engine Control Panel
                              •  Caterpillar Alarm and Protection
                              •  Load Sharing Attachment
                            • MECP I - Marine Engine Control Panel
                              • Caterpillar Alarm and Protection
                                • Load Sharing Attachment
                                  • COOLING SYSTEM
                                    •  Aux Expansion Tank Flange Kit
                                  • FUEL SYSTEM
                                    •  Duplex Fuel Filters
                                    •  Fuel Cooler
                                    •  Primary Fuel Filters
                                    •  Flexible Fuel Lines
                                  • INSTRUMENTATION
                                    •  Instrument Panels
                                    •  OEM Wiring Harness
                                    •  Gauges
                                    •  Oil Level Sensor
                                  • LUBE SYSTEM
                                    •  Duplex Oil Filters
                                    •  Sump Pump
                                  • POWER TAKE-OFFS
                                    •  Crankshaft Pulleys
                                    •  Front Stub Shaft
                                    •  Hydraulic Pump Drive Adapter
                                    •  Front Enclosed Clutch
                                  • Crankshaft Pulleys
                                    • Front Stub Shaft
                                      • Hydraulic Pump Drive Adapter
                                        • Front Enclosed Clutch
                                          • PROTECTION SYSTEM
                                            •  Marine Classification Society and SOLAS
                                          • Marine Classification Society and SOLAS
                                            • STARTING SYSTEM
                                              •  Electric Starting Motors - Single 24 Volt
                                              •  Air Starting Motor
                                              •  Air Start Accessories
                                              •  Starting Aids - JW Heaters
                                              •  Battery Sets - 24 Volt - Dry
                                            • MOUNTING SYSTEM
                                              •  Front Support
                                              •  REAR ENGINE SUPPORT
                                            • Front Support
                                              • REAR ENGINE SUPPORT
                                                • PACKING
                                                  •  Engine Protective Cover
                                                  •  Storage Preservation
                                                  •  Export Packing
                                                • Engine Protective Cover
                                                  • Storage Preservation
                                                    • Export Packing
                                                      Built for it