Cat® C18 ACERT Propulsion Engine (Tier 3)

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Cat® C18 ACERT Propulsion Engine (Tier 3)

Power Range 469-1001 bhp (350-747 bkW)
Speed Range 1800-2300 rpm
Emissions EPA Tier 3 Commercial, IMO II, EU IW
Aspiration TA, TTA
Bore 6 in
Stroke 7 in
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Power Rating
Power Range 469-1001 bhp (350-747 bkW)
Power Range 454 - 1136 bhp (339 - 847 bkW)
Engine Specifications
Speed Range 1800-2300 rpm
Emissions EPA Tier 3 Commercial, IMO II, EU IW
Aspiration TA, TTA
Bore 6 in
Stroke 7 in
Displacement 1,106 in3
Configuration In-line 6, 4-Stroke-Cycle Diesel
Rotation from Flywheel End Counterclockwise
Speed Range 1500 - 2100 rpm
Emissions U.S. EPA Tier 3 Commercial, IMO II, EU IWW, EU Stage V, China II
Aspiration Turbocharged - Aftercooled
Bore 6 in
Stroke 7 in
Displacement 1,106 in³
Oil Change Interval 250 / 500
Refill Capacity 49 / 68 l
Cooling Heat Exchanger or Keel Cooled
Governor Electronic
Flywheel Housing SAE No. 0 (136 teeth) or SAE No. 1 (113 teeth)
Application Workboat
Dimensions & Weights
Minimum Dry Weight 4,000 lb
Minimum Length 73 in
Minimum Height 47 in
Minimum Width 45 in
Maximum Length 76 in
Maximum Width 47 in
Maximum Height 51 in
Minimum Dry Weight 4,000 lb
Minimum Length 73 in
Minimum Height 47 in
Minimum Width 45 in

Power Range

Delivers 454–803 bhp across a wide 1800–2100 rpm operating range, giving workboat operators flexible propulsion performance for changing vessel demands and duty cycles.

Inline 6 Design

The 18.1 L inline 6 diesel platform uses a 145 × 183 mm bore and stroke with turbocharging and separate circuit aftercooling to support sustained commercial output.

Cooling Options

Available heat exchanger and keel cooled configurations help simplify integration across different hull designs, operating environments and vessel requirements.

Emissions Compliance

Meets U.S. EPA Tier 3, IMO II, EU IWW, EU Stage V and China II standards, helping fleets operate across regulated waterways and global workboat applications.

Compact Footprint

A 73 in 1854 mm engine length and under 4000 lb dry weight help support installation in space constrained workboat engine rooms and repower applications.

Smart Monitoring

Electronic diagnostics and fault logging monitor engine and transmission speed, temperature and pressure, helping crews support proactive fleet management and uptime.

  • 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
    • Air Start Accessories
  • 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
    • SAE No. 0, Flywheel SAE. 18, 136 teeth
    • 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
  • General
    • Front damper guard
    • Front service engine
    • Common electrical bonding point
    • Engine does not ship with zinc components
  • 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 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 +/-
  • Exhaust System
    • Dry Elbows
    • Water-Cooled Elbows
    • Flexible Fitting
    • Outlet 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
    • CAT Alarm and Protection
  • Cooling System
    • Aux expansion tank flange kit
    • Exhaust Temp Sensor
    • Heat Exchanger Pressure Sensor
  • Fuel System
    • Duplex Fuel Filters
    • Flexible Fuel Lines
    • Fuel Cooler
    • Fuel/Water Separator
  • Instrumentation
    • Instrument Panels
    • OEM Wiring Harness
    • Engine to Engine Harness
    • Transmission Sensors
    • Oil Level Sensor
  • Instrumentation
    • Digital Tachometer
  • Lube System
    • Duplex Oil Filters
    • Transmission Oil Cooler
    • Sump Pump
  • Mounting System
    • Vibration Isolators
    • Front Support
    • Rear Support
  • Power Take-offs
    • NOTE: PTO options require torsional vibrations analysis
    • Crankshaft Pulleys
    • Front Stub Shaft
    • Hydraulic Pump Drive Adapter
    • Front Enclosed Clutch
  • Protection System
    • Marine Classification Society and SOLAS
  • Starting System
    • Electric Starting Motors - Single 24 Volt
    • Starting Aids - JW Heater 120 / 240V
    • Single Electric 24V Starter
    • Battery Sets - 24 Volt - Dry
    • Single Air Starting Motor
  • Packing
    • Engine Protective Cover
    • Storage Preservation
    • Export Packing
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