Cat C18 ACERT High Performance Propulsion Engine (Tier 3 Recreational)

The C18 ACERT marine propulsion engine has ratings for recreational applications that meet U.S. EPA Tier 3, IMO II, and EU Stage IIIA Regulations. This marine engine incorporates the latest core engine system innovations to provide maximum benefits in power density, performance, emissions, and fuel efficiency. Not only is it equipped with engine monitoring and protection features, it is also compatible with Cat display and vessel control systems. With this engine comes the unmatched worldwide marine support network including Cat dealers and hundreds of authorized marine dealers. Their combined experience and expertise, products and services, backup and support allow your recreational pleasure craft to remain precisely that — a pleasure.


Power Range 1015-1150 mhp, 1001-1136 bhp, 747-847 bkW


Speed Range 2300 rpm
Emissions EPA Tier 3, IMO II, EU IW
Aspiration TA,TTA
Bore 5.7in
Stroke 7.2in
Displacement 1106in³
Rotation from Flywheel End Counterclockwise
Configuration In-line 6, 4-Stroke-Cycle Diesel

Dimensions & Weights

Maximum Height 51.2in
Maximum Dry Weight 4299lb
Maximum Width 47.4in
Maximum Length 76in
Minimum Length 73in
Minimum Dry Weight 4000lb
Minimum Width 44.6in
Minimum Height 47.2in

Standard Equipment

  • Air Inlet System
    • Aftercooler - sea water, corrosion resistant
    • Air cleaner/fumes disposal (closed system)
    • Turbocharger, jacket water cooled
    • Front-down and rear-down aftercooler condensate drains
  • Control System
    • Electronic diagnostics and fault logging
    • Cold mode start strategy
    • Engine and transmission monitoring (speed, temperature, pressure)
    • Electronic fuel/air ratio control
    • 70-pin customer connector
    • Engine Protection Mode for High Ambient Conditions
    • Three types of throttle inputs (primary/ secondary PWM, 0-5V, 4-20mA +/-)
  • Cooling System
    • Sea water pump, rubber impeller, self-priming, gear driven
    • Sea water aftercooled
    • Jacket water pump, gear driven
    • JW Heat Exchanger - Titanium plate with integral fuel cooler expansion tank, and thermostat housing (fully open temp 92C)
    • Coolant recovery system
  • Exhaust System
    • Water-cooled exhaust manifold & turbocharger
    • 114.3 mm (4.5 in) ID round flanged exhaust outlet
  • Flywheels & Flywheel Housings
    • Flywheel Housing, SAE No. 1
    • Flywheel, 18 inch, 113 teeth
    • SAE standard rotation
  • Fuel System
    • Fuel filter, RH service on Port, LH service on Starboard
    • Fuel transfer pump
    • Fuel priming pump
    • Hybrid fuel line design
  • Lube System
    • Crankcase breather
    • Oil cooler
    • Oil filter, spin-on, low profile, RH service on Port, LH service on
    • Oil pan, center sump
    • Dipstick, RH service on Port, LH service on Starboard
    • Oil pump, gear driven
  • Power Take-offs
    • Hydraulic pump drive, SAE A, 11-tooth spline, 46 ft-lbs max torque, counterclockwise as viewed from the front of the engine with 1.41 x engine speed
    • Crankshaft pulley, 292 mm (11.5 in) two groove, 15.88 mm (0.63 in) width
  • Protection System
    • A4 ECM Electronic Engine Monitoring System provides customer programmable engine de-rate strategies to protect against adverse operating conditions
  • General
    • Front damper guard
    • Lifting eyes
    • RH or LH service options
    • Upper rear-facing customer wiring connector and Service Tool connection

Optional Equipment

  • Charging System
    • Battery Chargers
    • Charging Alternators
  • Fuel System
    • Primary Fuel Filter / Water Separator
    • Primary Fuel Filter
  • Lube System
    • Transmission Oil Cooler
  • Power Take-offs
    • Crankshaft Pulleys
  • Starting System
    • Electric Starting Motor - Single 24 Volt
    • Battery Sets - 24 Volt - Dry
  • Control System
    • MECP I
  • Instrumentation
    • OEM Wiring Harness
    • Engine to Engine Harness
    • Instrument Panels
    • Transmission Sensors