Caterpillar C18-454 Marine Inboard Engine
The Caterpillar C18-454 marine inboard engine is a six-cylinder, four-stroke diesel engine from Caterpillar’s C18 marine engine family. Built around an approximately 18.1-litre displacement, the C18 platform combines turbocharged performance, electronic engine management and a heavy-duty engine design for marine propulsion applications.
Looking for a Caterpillar C18-454 marine engine for sale? Contact JB Marine GmbH to request pricing, available engine configurations, compatible marine gearbox options and international delivery costs.
The exact C18-454 designation should be checked against the engine identification plate and Caterpillar documentation before confirming rated horsepower, engine speed, emissions certification or package specifications. Caterpillar has produced multiple C18 marine ratings, and their specifications are not interchangeable.
Caterpillar C18 Diesel Power for Marine Propulsion
The Caterpillar C18 marine diesel engine platform is used in marine applications where substantial propulsion power, engine durability and integration with vessel systems are important.
Its six-cylinder inline configuration provides a foundation for marine propulsion installations, with electronic controls managing engine operation according to the specific model and rating.
Key characteristics of the C18 engine family include:
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Six-cylinder diesel design: An inline, four-stroke engine configuration developed for demanding applications.
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Turbocharged performance: Air-handling technology designed to support the engine’s specified output.
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Electronic engine management: Controls engine operation and supports diagnostic functions.
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Marine cooling arrangements: Cooling components configured for the intended marine application.
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Transmission compatibility: Suitable marine gearboxes can be selected according to the engine rating, drivetrain arrangement and vessel requirements.
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Marine propulsion applications: C18 configurations are used in various recreational and commercial vessel applications, subject to the approved rating.
Actual vessel performance depends on hull design, displacement, propeller selection, gearbox ratio, installation and operating conditions.
Technical Specifications
The following specifications are based on Caterpillar’s published C18 commercial propulsion information. The 454 bhp rating is documented in Caterpillar’s C18 ACERT performance data.
| Specification | Manufacturer Reference |
|---|---|
| Engine model | Caterpillar C18 ACERT |
| Listed product designation | C18-454 |
| Engine configuration | Inline six-cylinder, four-stroke diesel |
| Rated output, 454 bhp configuration | 339 bkW / 454 bhp at 1,800 rpm |
| Displacement | 18.1 litres |
| Bore × stroke | 145 × 183 mm |
| Aspiration | Turbocharged and aftercooled |
| Engine governor | Electronic |
| Cooling options | Heat exchanger or keel cooling, depending on configuration |
| Crankshaft rotation | Counterclockwise, viewed from flywheel end |
| Flywheel housing options | SAE No. 0 or SAE No. 1, depending on configuration |
| Minimum dry engine weight | Approximately 1,814 kg for the published C18 range |
| Reference minimum length | 1,854 mm |
| Reference width | 1,134–1,204 mm across published configurations |
| Reference height | 1,198–1,300 mm across published configurations |
| Emissions certification | Depends on engine version, rating and certification |
Important: The dimensional and weight figures are C18 family references, not a verified installation drawing for every 454 bhp configuration. Actual dimensions and weight may differ with cooling equipment, flywheel housing, accessories and marine transmission.
Caterpillar’s published performance sheet identifies the 454 bhp / 339 bkW rating at 1,800 rpm under rating reference EM0082-00.
Review the official Caterpillar C18 marine propulsion specifications and Caterpillar C18 ACERT performance documentation for manufacturer reference information.
Marine Gearbox and Transmission Options
The Caterpillar C18-454 inboard diesel engine can be evaluated for integration with a suitable marine reduction gearbox.
Gearbox selection must account for the engine’s torque characteristics, rated speed, vessel resistance and propeller arrangement.
Important considerations include:
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Gearbox manufacturer and model: Select a marine transmission with suitable input torque and power ratings.
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Reduction ratio: Match the gearbox ratio to the propeller and vessel’s operating requirements.
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Output arrangement: Confirm whether the installation requires an inline, down-angle or other compatible arrangement.
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Propeller compatibility: Check shaft diameter, propeller dimensions and expected operating loads.
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Mounting and alignment: Verify engine beds, coupling dimensions and shaft alignment.
ZF and Twin Disc manufacture marine transmissions in power classes relevant to large diesel propulsion installations, but compatibility with a particular C18-454 must be established using the exact gearbox model and technical data.
For an engine replacement, provide your existing gearbox model, reduction ratio, propeller dimensions and shaft arrangement when requesting a quotation.
Electronic Engine Controls and Monitoring
The Caterpillar C18 marine engine family uses electronic engine governing and supports marine instrumentation and monitoring arrangements.
Depending on the specific engine version and equipment package, the installation may incorporate electronic engine controls, monitoring displays, diagnostic connections and transmission-related instrumentation.
Caterpillar documentation identifies instrumentation and control equipment options for C18 marine propulsion configurations.
When enquiring about the Caterpillar C18-454 marine engine, confirm:
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Engine control system and electronic configuration
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Instrument panel or display requirements
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Throttle and shift control compatibility
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Wiring harnesses and connection requirements
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Diagnostic equipment compatibility
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Single-engine or twin-engine installation
Do not assume that helm controls, displays or wiring harnesses are included with a bare engine quotation.
Match the 454 HP Rating to Your Operating Requirements
The Caterpillar C18 454 HP marine diesel engine is documented at 339 bkW / 454 bhp at 1,800 rpm in Caterpillar’s historical C18 ACERT performance information.
This rating is associated with a particular engine performance configuration and should not be confused with higher-output C18 variants.
Caterpillar offers multiple C18 marine propulsion ratings with different intended operating profiles.
For a correct application assessment, consider:
Vessel displacement: Heavier vessels generally require a different propulsion assessment from lightweight planing hulls.
Operating profile: Continuous commercial operation places different demands on an engine than intermittent recreational use.
Propeller demand: The propeller must allow the engine to operate within its approved performance range.
Cooling capacity: Cooling arrangements must be suitable for the intended installation.
Certification: Emissions and regulatory requirements depend on the vessel, jurisdiction and engine configuration.
The 454 bhp rating appears in Caterpillar’s A-rating performance data. The applicable rating definition and permissible duty cycle should be confirmed from the documentation for the exact engine serial number.
Marine Engine Replacement and Repowering Considerations
The Caterpillar C18-454 marine inboard engine may be considered for a suitable marine repowering project, subject to engineering verification.
Before replacing an existing engine, evaluate:
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Engine-room dimensions and access
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Engine mounting locations
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Gearbox and propeller shaft compatibility
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Exhaust-system capacity
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Cooling-water arrangements
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Fuel supply and return systems
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Electrical starting and charging requirements
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Electronic controls and instrumentation
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Vessel weight distribution
For twin-engine vessels, the replacement project should also consider matched engine ratings, gearbox configurations and propulsion-system compatibility.
A successful repower depends on the complete propulsion system, not engine horsepower alone.
Pricing, Package Contents and Warranty
Looking for the Caterpillar C18-454 marine diesel engine price?
Contact JB Marine GmbH for an itemised quotation based on the required engine configuration and delivery destination.
Before placing an order, request written confirmation of:
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Engine condition: New, unused surplus, remanufactured or used, as applicable.
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Engine identification: Model, serial number and verified power rating.
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Package contents: Engine, cooling equipment, electrical accessories and included components.
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Marine gearbox: Whether a transmission is included or quoted separately.
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Controls: Instrumentation, wiring harnesses and helm control equipment.
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Documentation: Available specification sheets, identification details and test records.
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Availability: Current stock status or expected lead time.
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Warranty: Applicable coverage, exclusions and claims procedures.
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Shipping: Freight arrangements and delivery costs.
Any manufacturer warranty should be confirmed for the particular engine’s condition, age, supply channel and eligibility.
Frequently Asked Questions
How much horsepower does the Caterpillar C18-454 produce?
Caterpillar’s C18 ACERT performance documentation identifies a 454 bhp / 339 bkW rating at 1,800 rpm. Confirm the exact engine configuration using its identification plate and serial-number documentation.
What is the displacement of the Caterpillar C18 marine engine?
The Caterpillar C18 marine diesel engine has a displacement of approximately 18.1 litres, with six cylinders arranged in an inline configuration.
Is the Caterpillar C18-454 turbocharged?
Yes. The documented C18 marine propulsion platform uses turbocharged and aftercooled engine configurations.
Does the Caterpillar C18-454 come with a gearbox?
A gearbox should not be assumed to be included. The exact package contents must be confirmed in the seller’s quotation.
Can the Caterpillar C18-454 replace an older marine diesel engine?
It may be suitable for a repowering project if the engine rating, installation dimensions, drivetrain, cooling, exhaust and control systems are compatible. A qualified marine propulsion specialist should assess the installation.
Request Your Caterpillar C18-454 Quote
Looking to purchase a Caterpillar C18-454 marine inboard engine for a commercial vessel, yacht or marine repowering project?
Contact JB Marine GmbH to request engine pricing, technical information, compatible transmission options and delivery arrangements.
When requesting a quotation, include your vessel type, existing engine model, preferred gearbox and reduction ratio, required package contents, intended operating profile and delivery destination.
This information will help establish the appropriate engine configuration and commercial requirements
