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Minimum Rating624 BHP (465 bkW)
Maximum Rating803 BHP (599 bkW)
AspirationTA, TTA
Bore5.7 in (145 mm)
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 EPA Tier 3, IMO II, EU Stage IIIA compliant ratings are available with heat exchanger or keel cooled options. All major MCS type approvals are available from the factory.


Minimum Rating624 BHP (465 bkW)
Maximum Rating803 BHP (599 bkW)
AspirationTA, TTA
Bore5.7 in (145 mm)
Displacement1106 in³ (18.1 l)
ConfigurationIn-Line 6, 4-Stroke-Cycle Diesel
Stroke7.2 in (183 mm)
Rotation from Flywheel EndCounterclockwise
Length73 in (1854 mm)
Height51.2 in (1300 mm)
Dry Weight1950 lb (4299 kg)
Width44.6 in (1134 mm)

Benefits and Features

The primary advantage of the separate circuit aftercooling system (SCAC) is that no sea water circulates through the aftercooler

EPA Tier 3 compliant, IMO II and EU IWW compliant

Heat exchanger and Keel cooled options for all ratings

Single turbo configurations for all ratings

All major MCS type approvals available from factory

Standard Equipment

  • Separate circuit after-cooled (SCAC)
  • Open Crankcase Ventilation (OCV) system
  • Turbocharger, jacket water cooled
  • Turbocharger inlet, 152 mm (6 in) OD straight connection
  • 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
  • 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
  • 152 mm (6 in) round flanged outlet
  • Water-cooled exhaust manifold & turbocharger
  • Flywheel Housing, SAE No. 0
  • Flywheel, 18 inch, 136 teeth
  • SAE standard rotation
  • Front service simplex fuel system
  • Fuel transfer pump, gear driven
  • Manual fuel priming pump
  • Hybrid fuel line design
  • Front service simplex oil system
  • Center sump oil pan:
  • Front and top service oil filler locations
  • Front service dipstick
  • Oil pump, gear driven
  • Front support - adjustable
  • Hydraulic Pump Drive
  • Crankshaft Pulleys
  • Front Stub Shaft
  • Front Enclosed Clutch
  • 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

Optional Equipment

  • Dry Elbows
  • Water-Cooled Elbows
  • Flexible Fitting
  • Flange
  • Muffler
  • Muffler Spark Arresting
  • Air Inlet Adapter
  • Battery Chargers
  • Charging Alternators
  • Alternator Mounting Group
  • Ammeter
  • MECP I - Marine Engine Control Panel
  • Caterpillar Alarm and Protection
  • Load Sharing Attachment
  • Aux Expansion Flange Kit
  • Duplex Fuel Filters
  • Fuel Cooler
  • Primary Fuel Filters
  • Flexible Fuel Lines
  • Instrument Panels
  • OEM Wiring Harness
  • Gauges
  • Oil Level Sensor
  • Duplex Oil Filters
  • Sump Pump
  • Crankshaft Pulleys
  • Front Stub Shaft
  • Hydraulic Pump Drive Adapter
  • Front Enclosed Clutch
  • Marine Classification Society and SOLAS
  • Electric Starting Motors - Single 24 Volt
  • Air Starting Motor
  • Air Start Accessories
  • Starting Aids - JW Heaters
  • Battery Sets - 24 Volt - Dry
  • Front Support
  • Engine Protective Cover
  • Storage Preservation
  • Export Packing