New | Cat C18 ACERT Propulsion Engine (IMO II)

The C18 ACERT marine propulsion engine has commercial application ratings of 454-715 bhp that meet IMO II & EU Stage IIA emissions regulations, and 469-715 bhp that meet EPA Tier 3, IMO II and EU Stage IIIA emissions regulations. In addition to the benefits the C18 ACERT’s advanced marine engine technology brings, you welcome aboard legendary Cat product support. No matter where your spirit of adventure takes you, rest assured the Cat Dealer Network is close by.

Power Rating
Power Range454-715 bhp (339-533 bkW)
Engine Specifications
Speed Range1800-2100 rpm
ConfigurationIn-line 6, 4-Stroke-Cycle Diesel
AspirationTA, TTA
Bore5.7 in
Stroke7.2 in
Displacement1106.0 in3
Rotation (from flywheel end)Counterclockwise
EmissionsIMO II, EU IIIA
Dimensions & Weights
Minimum Length73.0 in
Maximum Length76.0 in
Minimum Width44.6 in
Maximum Width47.4 in
Minimum Height47.2 in
Maximum Height51.2 in
Maximum Dry Weight4299 lb
Minimum Dry Weight4000.0 lb

Heat Exchanger And Keel Cooled Options For All Ratings

Imo Ii And Eu Iww Compliant For All Ratings

The Primary Advantage Of The Separate Circuit Aftercooling System (scac) Is That No Sea Water Circulates Through The Aftercooler.

Specific Ratings Are Available That Meet Imo Ii Emissions Regulations And Additional Ratings Are Available That Meet Both Epa Tier 3 And Imo Ii Emissions Regulations.

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
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
  • Sea water pump, bronze impeller, gear driven
  • SCAC and JW shunt tanks for maintaining proper pump inlet pressures
Exhaust System
  • Water-cooled exhaust manifold & turbocharger
  • 152 mm (6 in) round flanged outlet
Flywheels & Flywheel Housings
  • Flywheel Housing, SAE No. 0
  • Flywheel, 18 inch, 136 teeth
  • SAE standard rotation
  • SAE No. 1, Flywheel: 14 inch, 113 teeth
Fuel System
  • 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: Deep; 500 hour oil change interval, Shallow; 250 hour oil change interval
  • Front and top service oil filler locations
  • Front service dipstick
  • Oil pump, gear driven
Mounting System
  • Front support - adjustable
Power Take-Offs
  • Poly-V groove for alternator drive
  • NOTE: There are no standard power take-offs available
  • Front damper guard
  • Front service engine
  • Common electrical bonding point
  • Engine does not ship with zinc components
  • Engine is certified to D2/E2 emissions cycles
  • Certified to IMO II Marine Commercial Propulsion (E3) Cycle Emission Standards
  • Certified to EU Stage IIIA AND CCNR Stage II (E3 Cycle) Emissions Standards.
  • NOTE: Ratings listed below can also be used in Recreational / Pleasure Craft applications.
Control System
  • Programmable low idle
  • WOSR (Wide Operating Speed Range) available for EPA Tier 3 - B and C Ratings
  • Adjustable High Idle (TEL) - EPA Tier 3 WOSR Ratings Only
  • Electronic diagnostics and fault logging
  • Engine and transmission monitoring (speed, temperature, pressure)
  • Electronic fuel/air ratio contro
  • Engine Protection Mode for extended ambient conditions - EPA Tier 3 Ratings Only
  • Torque Limiting functionality for WOSR ratings only
  • 70-pin customer connector
  • Three types of throttle inputs (primary/ secondary PWM, 0-5V, 4-20mA +/-



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