Cat® C18 Diesel Engine

The Cat® C18 Industrial Diesel Engine is offered in ratings ranging from 429-522 bkW (575-700 bhp)@ 1800-1900 rpm. Industries and applications powered by C18 engines include: Agriculture, Ag Tractors, Aircraft Ground Support, Bore/Drill Rigs, Chippers/Grinders, Compactors/Rollers, Compressors, Construction, Cranes, Dredgers, Forestry, General Industrial, Hydraulic Power Units, Irrigation Equipment, Material Handling, Mining, Mobile Earthmoving Equipment, Paving Equipment, Pumps, Shovels/Draglines, Surface Hauling Equipment and Trenchers.


When it comes to keeping engine installation costs down, customization is key. With plenty of options to keep the engine package size to a minimum, the Cat C18 is a fully-configurable engine giving owners the power to customize based on a variety of applications.

Advanced Features

With a DEF capacity of 93.7 liters and 5,000-hour service intervals, the Cat C18 also features transparent regeneration technology giving owners the power to stay more productive—when its needed the most.

Ideal Applications

Industrial, agricultural and construction applications such as: Asphalt paving equipment • Compressors • Bore rigs • Drill rigs • Chippers • Grinders • Hydraulic power units • Pumps • Trenchers • Irrigation Equipment

Total Cost of Ownership

Whether you own a fleet of machines or even just one, it's important to keep lifetime costs of the engine low. The Cat C18 aims to do just that through a combination of technologies that only require 500-hour service intervals and optimize fluid consuption levels to be the most effective and efficient no matter the application.

Cat Dealer Product Support

With product support offered through the global Cat dealer network and an included warranty, the Cat C18 offers peace of mind with scheduled maintenance and simplified service routines. See your Cat dealer for details.


Clean air isn't just about creating a better world, it's about work site saftey as well. That's why the Cat C18 features a clean emissions module that uses DOC, DPF and SCR tecnologies to keep the engine running cleaner than ever before.

Standard Equipment

Air Inlet System
  • Turbocharged
  • Air-to-Air Aftercooled
  • Mid-mount turbocharged system with front and rear exhaust configurations (Tier 4 Final, Stage V)
Control System
  • Electronic control system
  • Over-foam wiring harness
  • Automatic altitude compensation
  • Power compensated for fuel temperature
  • Remote fan control
  • Configurable software features
  • Engine monitoring system SAE J1939 broadcast and control
  • Integrated Electronic Control Unit (ECU)
Cooling System
  • Thermostats and housing, vertical outlet
  • Centrifugal water pump
  • Guidance on cooling system design available through your dealer to ensure equipment reliability
Flywheels and Flywheel Housing
  • Choice of SAE No. 0 or SAE No. 1 flywheel housing
  • Available SAE No. 1 power take off with optional SAE A, SAE B or SAE C power take off drives. Engine power can also be taken from the front of the engine with optional attachments. (Tier 4 Final, Stage V).
Fuel System
  • MEUI injection
  • Primary fuel filter
  • Secondary fuel filters
  • Fuel transfer pump
  • Electronic fuel priming
Lube System
  • Open crankcase ventilation system
  • Oil cooler
  • Oil filler
  • Lube oil filter
  • Oil dipstick
  • Gear driven oil pump
  • Choice of front, rear or center sumps
  • Open crankcase ventilation system with fumes disposal (optional OCV filter system) (Tier 4 Final, Stage V)
Power Take Off (PTO)
  • SAE A, SAE B or SAE C power take off (PTO) drives. Engine power can also be taken from the front of the engine on some applications.
  • Paint: Caterpillar yellow, with optional colors available at request
U.S. EPA Tier 4 Final, EU Stage V Aftertreatment/ Clean Emissions Control Equipment
  • Aftertreatment information applies to ratings from 429-522 bkW (575-700 bhp)
  • Cat Regeneration System
  • Clean Emissions Module (CEM), consisting of Diesel Particulate Filter (DPF) and Diesel Oxidation Catalyst (DOC)
  • Aftertreatment Electronic Control Unit (ECU)
  • NOx Reduction System (NRS)
  • Pump Electronic Control Unit (PETU)
  • Selective Catalytic Reduction (SCR)
  • Available in 12V or 24V systems

Additional information

Offering Type

Power Rating - Maximum Power

597 kW ( 800 HP )

Power Rating - Maximum Torque

3710 Nm @ 1300 rpm ( 2736 lb-ft @ 1300 rpm )

Power Rating - Rated Speed


Power Rating - Minimum Power

429 kW ( 575 HP )

Emission Standards - Emissions

EU Stage V

General - Engine Configuration

In-Line 6

General - Bore

145 mm ( 5.7 in )

General - Stroke

183 mm ( 7.2 in )

General - Displacement

18.1 l ( 1104.5 in³ )

General - Compression Ratio


General - Aspiration

Turbocharged-Aftercooled (TA) or Series Turbocharged Aftercooled (TTA)

General - Combustion System

Direct Injection

General - Rotation from Flywheel End


General - Aftertreatment


Engine Dimensions - Approximate - Length

1438 mm ( 56.6 in )

Engine Dimensions - Approximate - Width

1132 mm ( 44.6 in )

Engine Dimensions - Approximate - Height

1356 mm ( 53.4 in )

Engine Dimensions - Approximate - Weight - Net Dry - Basic Operating Engine Without Optional Attachments

1717 kg ( 3785 lb )

Aftertreatment Dimensions - Length

1153 mm ( 45.4 in )

Aftertreatment Dimensions - Width

1112 mm ( 43.8 in )

Aftertreatment Dimensions - Height

652 mm ( 25.7 in )

Aftertreatment Dimensions* - Diameter

356 mm ( 14 in )

Aftertreatment Dimensions - Weight

272 kg ( 600 lb )

PETU Dimensions - Tier 4 Final Only - Length

854 mm ( 33.6 in )

PETU Dimensions - Tier 4 Final Only - Width

287 mm ( 11.3 in )

PETU Dimensions - Tier 4 Final Only - Height

551 mm ( 21.7 in )

PETU Dimensions - Tier 4 Final Only - Weight

19.4 kg ( 42.8 lb )

PETU Dimensions - Tier 4 Final Only - Volume Capacity

48.4 l ( 51.1 qt (US) )

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