Caterpillar C18 Marine Engines

Caterpillar C18 Marine Engines for Sale – Equip Your Boat with CAT Reliability

When you need a high-performance, dependable marine engine for your commercial or recreational boat, Caterpillar C18 marine engines are one of the best in the market. If you’re repowering an offshore supply vessel, commercial tug, fishing vessel, or luxury yacht, the C18 delivers the power, efficiency, and reliability you need in the water.

We simply focus on selling Caterpillar C18 marine engines online—both new engines and expertly remanufactured engines. With stocks on hand, reduced prices, and helpful technical support, it’s simple to purchase the horsepower your boat needs.

Why Should You Purchase a Caterpillar C18 Marine Engine?

Caterpillar is world-famous for engineering excellence, and the C18 marine engine is no exception. The CAT C18 boasts a track record of performance and reliability and is ship owners’ top pick as a marine engine worldwide. And the reason the C18 towers above the rest is:

1. Excellent Power-to-Weight Ratio

The C18 horsepower rating is 600-1,150 hp by configuration. The engine has been developed to give high output with no weight penalty and can be used in those applications where speed, maneuverability, and fuel efficiency are of high importance.

2. Marine-Grade Durability

In continuous duty marine application, the C18 offers:

• Heavy-duty cast iron block and cylinder head
• Seawater aftercooled
• High-strength components to withstand corrosion and wear

3. EPA and IMO Compliant

The new C18 engines meet U.S. EPA Tier 3, IMO II, and EU Stage IIIA emission standards. We offer engines in different emissions configurations to meet local compliance needs.

4. Electronic Management for Peak Efficiency

The C18 uses Caterpillar’s advanced ADEM (Advanced Diesel Engine Management) technology, which allows precise fuel control, engine monitoring, and simpler interfacing with new marine equipment. These include:

• Lower fuel consumption
• Simpler maintenance
• Less downtime

Our C18 Marine Engines for Sale

Purchasing a C18 marine engine online from us is not just about purchasing equipment. You’re purchasing performance, service, and assurance.

What we have to offer:

✅ New C18 Marine Engines
New-from-the-factory-built engines to Caterpillar specifications and warranty-supported service. Ideal for new boat construction or high-power retrofits.

✅ Rebuilt & Remanufactured C18 Engines
Professional reconditioning to OEM specs using genuine CAT parts or direct replacement. All our rebuilt C18 marine engines receive:

• Complete disassembly and inspection
• Cylinder head overhaul
• Injector and turbocharger replacement or overhaul
• Assembly with new bearings, seals, and gaskets
• Dynamometer testing for guaranteed performance

These engines are ideal for customers who want like-new performance without the expense.

✅ Used C18 Marine Engines
Low-hour, test-run engines from ships in service. These are compression-tested and inspected for reliability. Used engines are a cost-effective option with immediate delivery.

Caterpillar C18 Marine Engine Specifications

To provide an idea of what you’re buying, the following are the standard specifications of our C18 marine engines. Individual configurations will vary by application and model year:

Specification	Details
Configuration	Inline 6-cylinder
Displacement	18.1 liters (1106 cubic inches)
Aspiration	Turbocharged and aftercooled
Horsepower Range	600–1150 hp (varies by model)
Max Torque	Up to 3,500 Nm
Cooling System	Heat exchanger or keel-cooled
Control System	ADEM 3 or 4 ECM
Emissions Compliance	EPA Tier 3, IMO II, EU Stage IIIA
Fuel System	Electronic Unit Injection or Common Rail

We carry both C18 ACERT marine engines and non-ACERT C18s depending on your horsepower and emissions requirements.

Applications – Where the C18 Marine Engine Excels

The C18 is designed for heavy-duty marine use. Here are just a few applications where this engine truly excels:

Yachts and Recreational Vessels

High-torque, low-noise engines are needed by luxury yachts that demand maximum cruise speed with minimal vibration and emissions. The C18 is put into luxury yachts that need clean power and extremely high reliability.

Commercial Fishing Boats

For day-long fishing and rough offshore fishing, the C18 delivers heavy-duty torque and the durability to operate for thousands of hours with routine maintenance.

⚓ Tugs and Towboats

In low-RPM, high-torque applications such as barging or towing, the C18 delivers smooth, responsive power where and when it’s needed.

Ferries and Workboats

Operators of passenger vessels appreciate the fuel economy and long-term reliability of the C18, which reduces operating costs and unplanned downtimes.

Why Buy Your Caterpillar C18 Marine Engine Online from Us

We understand—buying a marine engine online isn’t peanuts. So we’re gonna make this easy, simple, and backed by real people with real knowledge.

Expert Advice

Having trouble figuring out your engine configuration? Give us your serial number or specs on your existing engine or boat—we’ll get you paired up with the right C18 model.

Fair Prices

These direct supply chain relationships allow us to offer competitive pricing on new and remanufactured Caterpillar C18 marine engines. We don’t overcharge—we’re seeking long-term customer relationships.

Shipping Worldwide

We ship Caterpillar C18 marine engines to ports and shipping worldwide. All engines are:

• Crated for protection
• Insured
• With tracking and delivery notification

After-Sales Support

Need installation assistance or maintenance service on your engine? We provide installation assistance, part assistance, and service manuals. Our support team is only a phone call or email away.

Warranty Options

A 6 to 12 month (unit depending) warranty is provided on all remanufactured and rebuilt C18 marine engines. Extended warranty options are available.

What to Know Before You Buy

To ensure you’re getting the right Caterpillar C18 engine for your vessel, consider the following:

1. Know Your Application

Is your vessel a high-speed yacht or a commercial trawler? The engine configuration should match your workload and fuel efficiency needs.

2. Consider Emissions Compliance

Depending on where you’ll be running, your engine may need to meet some emissions standards (e.g., IMO II or EPA Tier 3). Let us know where you are or where you’ll be operating.

3. Select the Proper Cooling System

There are boats with heat exchanger cooling and keel-cooled boats. We stock both and can help you make a decision based on your boat’s configuration.

Customer Testimonials – Real Success at Sea

“I installed a remanufactured C18 marine engine from these guys in my commercial fishing vessel. It’s like new, starts first pull every time, and gas mileage is improved over expectations. Shipping was prompt and professional.”
— Mike R., Port of Seattle

” Purchased two CAT C18s for our 85-ft yacht build. Engines were spotless, dyno-tested, and arrived sooner than anticipated. Support was excellent at all phases.”
— Andrea F., Miami, FL

“18,000 hours on our old engine and it was time for an upgrade. Saw the new one here and couldn’t be more pleased. Smooth running and strong pulling engine.”
— Leo D., Louisiana Gulf Coast

Frequently Asked Questions (FAQs)

Q: How can I determine if the C18 will fit on my boat?
Email us your current engine serial number or some pictures of your engine compartment. We can help with fitment verification or supplying appropriate alternatives.

Q: Can you help in determining whether to opt for a rebuilt or new engine?
Yes, certainly. If you’re on a budget but require OEM performance, a rebuilt engine is usually the best value. For new boat construction or zero-hour application, we recommend installing a brand-new C18.

Q: Do you carry accessories or engine controls?
Yes! We carry engine control panels, wiring harnesses, gauges, mounts, and accessories to simplify installation.

Q: Can I arrange my own shipping?
Yes. You may arrange your own shipping if you prefer. We can provide weights, dimensions, and pick-up information.

Q: What type of payment do you accept?
We take financing arrangements (for qualified buyers), credit cards, and wire transfers. Please ask our salespeople for information.

Order Now – Caterpillar C18 Marine Engines for Sale

Ready to repower your boat with the legendary performance of a Caterpillar C18 marine engine? We stock engines and have them available to ship. Require a new build, repower project, or overhull spare engine? We can assist you in obtaining the right unit at the right price.

Provide us with your boat specifications, current engine (if any), and your location—and we’ll send a custom quote with shipping information and warranty details.

Last Words

The Caterpillar C18 is the most dependable marine engine in the world—backed by decades of real world proven longevity and CAT brand service. From fishing up fish or barging down river, to luxury cruising, the C18 will take you there with horsepower and reliability.

Buy your Caterpillar C18 marine engine today—with confidence, expertise, and support from diesel-experienced industry experts.