Cat® C18 ACERT Propulsion Engine (Tier 3)

Overview

The Cat® C18 commercial propulsion engine is built to deliver reliable, high-output power for workboats operating in demanding marine environments. Its inline 6-cylinder, four-stroke diesel design provides the durability and performance needed for long hours, heavy-duty duty cycles and consistent propulsion. Supported by the global Cat dealer network, the C18 helps keep vessels productive, serviceable and ready for the next job.

C18

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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.

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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.

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

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

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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.

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

Application: Workboat

Speed Range: 1800 – 2100 rpm

Emissions: U.S. EPA Tier 3 Commercial, IMO II, EU Stage V, China II

Aspiration: Turbocharged – Aftercooled

Bore: 5.7in

Stroke: 7.2in

Displacement: 1106in³

Rotation from Flywheel End: Counterclockwise

Oil Change Interval: 250 / 500

Refill Capacity: 49 / 68 l

Configuration: In-line 6, 4-Stroke-Cycle Diesel

Cooling: Heat Exchanger or Keel Cooled

Governor: Electronic

Flywheel Housing: SAE No. 0 (136 teeth) or SAE No. 1 (113 teeth)

Minimum Dry Weight: 4000lb

Minimum Length: 73in

Minimum Height: 47.2in

Maximum Height: 51.2in

Minimum Width: 44.6in

Maximum Width: 47.4in

Power Range: 454 – 1136 bhp (339 – 847 bkW)

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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Cat^® C18 ACERT Propulsion Engine (Tier 3)

Overview

C18

C18

C18

C18

C18

C18

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