Caterpillar C18 Engine for Sale | OEM Used 18.1 Liter (1,105 cu in) Inline-6 Turbocharged and Aftercooled Heavy-Duty Industrial Diesel
$68,500.00
At a Glance
- Condition: OEM used, all 6 cylinders compression tested
- Availability: In stock, Caterpillar C18 engines available
- Shipping: Free shipping to all 50 states via heavy freight, 7 to 14 business days
- Donor application confirmed (marine / construction / mining / oil and gas / agriculture / forestry / rail / generator)
- Hours on engine documented (from ECU or service log)
- Electronic unit injection function verified
- Turbocharger and aftercooler condition assessed
- Oil pressure verified at idle and operating temperature
- ACERT / electronic controls operation confirmed
- ECU calibration documented
- Cooling system inspected
- Block visual inspection
- Backed by a 15 day replacement warranty against internal defects
Description
About the Caterpillar C18 Engine
The Caterpillar C18 engine is a textbook example of long-term industrial engineering and reliable power generation. This 18.1L Inline-6 diesel exceptional durability makes it appropriate for marine propulsion, backup generator power, construction equipment, mining, oil and gas service (frac pumps and drilling rig power), agriculture, forestry, and rail auxiliary power. The C18 is equipped with ACERT technology that contributes to enhanced performance while adhering to strict EPA Tier 3 and IMO I emissions regulations.
The Caterpillar Heavy-Duty Diesel Family Context
For buyers comparing Caterpillar heavy-duty Inline-6 diesels, the C18 (this listing, 18.1L) is the largest of the Cat truck and industrial Inline-6 family. The Cat Inline-6 lineage running across truck and industrial applications: the 3306 (our vaz95 listing, 10.5L medium-duty heritage Cat); the 3406B mechanical (our vaz61 listing, 14.6L mechanical injection Class 8 truck and industrial); the 3406E electronic (our vaz83 listing, 14.6L electronic injection successor to 3406B); the C12 (our vaz89 listing, 12L mid-displacement); the C15 (our vaz85 listing, 15.2L the Class 8 highway flagship before CAT exited on-highway in 2010); and the C18 (this listing, the 18.1L industrial successor with the largest displacement). Each engine in the family targets specific applications by displacement and duty cycle: 3306 for medium-duty service, 3406 series and C15 for Class 8 highway, C12 / C15 for medium-heavy industrial, and the C18 for the largest industrial / marine / mining / oil and gas applications where displacement and torque output matter most.
Key Features
- ACERT Technology: Advanced Combustion Emission Reduction Technology meets EPA Tier 3 and IMO I standards
- Electronic Unit Injection: Precise fuel delivery via electronic unit injectors
- Turbocharging and Aftercooling: Improves power density and fuel efficiency
- Cat ET Diagnostic Interface: Electronic Technician provides real-time engine diagnostics
- Robust Cast Iron Block: Durability in demanding industrial applications
- Flexible Mounting Options: Adaptable across marine, mobile, and stationary applications
- Cold Start Capability: Reliable from arctic to tropical climates
The Cat C18 Engine Fits
The C18 has been installed in an exceptionally broad range of equipment across multiple industries:
Marine Applications:
- Luxury Motor Yachts: Sunseeker 95 Yacht, Westport 112 Motor Yacht, Viking 92 Convertible Yacht, Hatteras M90 Panacera Yacht
- Commercial Marine: Workboats, supply vessels, ferries, fishing vessels
Construction Equipment:
- Cat 374 Excavator, Cat 988K Wheel Loader, Caterpillar 992K Wheel Loader, Caterpillar D9T Dozer
Mining:
- Cat 785 Mining Truck, Cat D11 Dozer
Oil and Gas:
- Schlumberger QHSE Frac Pump, Nabors PACE-X800 Drilling Rig, Schramm T200XD Drilling Rig
Agriculture:
- Case IH Steiger 620 Tractor, John Deere S790 Combine, Challenger MT875E Tractor, Fendt 1100 Vario MT Tractor
Forestry:
- Tigercat LH855E Harvester, Morbark 6400XT Wood Hog
Rail:
- EMD GT46AC Locomotive (auxiliary power unit)
Emergency Services and Power:
- Caterpillar XQ570 Mobile Generator Set, Caterpillar XQ2000 Generator Set, Caterpillar C18 ACERT Generator Set
Why Buy a Used Cat C18
Opting for a used Cat C18 engine for sale can offer significant cost savings without compromising on quality. Our rigorous inspection and reconditioning processes ensure that every engine meets strict performance standards. With new C18 long blocks costing $75,000-$125,000+ and Cat reman units $55,000-$85,000, a quality used C18 represents substantial savings for applications where rebuild service life is acceptable.
Vehicle Compatibility
| Vehicle | Compatibility |
|---|---|
| Marine Propulsion | Luxury yachts (Sunseeker, Westport, Viking, Hatteras), workboats, ferries |
| Construction | Cat 374 excavator, 988K / 992K wheel loaders, D9T dozer |
| Mining | Cat 785 mining truck, D11 dozer |
| Oil and Gas | Schlumberger QHSE frac pump, Nabors PACE-X800, Schramm T200XD |
| Agriculture | Case IH Steiger 620, John Deere S790, Challenger MT875E, Fendt 1100 Vario MT |
| Forestry | Tigercat LH855E, Morbark 6400XT |
| Rail | EMD GT46AC locomotive auxiliary power |
| Emergency Power | Caterpillar XQ570, XQ2000, C18 ACERT generator sets |
Why Buy From Part Nests
- Donor application confirmed (marine, construction, mining, oil and gas, agriculture, forestry, rail, generator)
- Hours on engine documented from ECU data or service log
- All 6 cylinders compression tested
- Electronic unit injection function verified
- Turbocharger and aftercooler condition assessed
- Oil pressure verified at idle and operating temperature
- ACERT / electronic controls operation confirmed via Cat ET
- ECU calibration documented
- Free heavy freight delivery to all 50 states
- 15 day replacement warranty on internal defects
- Caterpillar industrial diesel experienced support team on the phone
- Call (855) 634-4447 to confirm Caterpillar C18 (18.1L Inline-6 industrial diesel, the largest of the Cat Inline-6 family, with ACERT technology and EPA Tier 3 / IMO I emissions), donor application (marine, construction Cat 374 / 988K / 992K / D9T, mining Cat 785 / D11, oil and gas frac pump / drilling rig, agriculture Steiger 620 / S790 / MT875E / Fendt 1100, forestry, rail auxiliary, or generator XQ570 / XQ2000), hours on engine, ECU calibration matching, and Cat Inline-6 family context (3306 per vaz95 medium-duty, 3406B per vaz61 mechanical, 3406E per vaz83 electronic, C12 per vaz89 mid-displacement, C15 per vaz85 highway flagship, C18 industrial largest displacement) before ordering
15 Day Replacement Warranty
Every used Caterpillar C18 engine purchased through Part Nests carries a 15 day replacement warranty starting on the delivery date.
What Is Covered
- Internal defects already present when the engine arrives
- Compression failures on any of the 6 cylinders beyond what was disclosed
- Cylinder head crack failures within 15 days from installation
- Electronic unit injection failures within 15 days from installation
- Turbocharger failures within 15 days from installation
- Aftercooler failures within 15 days from installation
- ACERT / electronic controls failures within 15 days from installation
- Connecting rod, lifter, or bearing failures within 15 days from installation
- Incorrect donor application calibration shipped due to an error on our end
What Is Not Covered
- Damage caused during installation
- Damage from running with contaminated diesel fuel (electronic unit injectors are sensitive to fuel contamination)
- Damage from extended oil change intervals or incorrect oil viscosity (Cat-approved heavy-duty diesel engine oil required)
- Damage from neglected cooling system or restricted aftercooler
- Damage from aggressive aftermarket tuning beyond Caterpillar-approved fuel maps
- Damage from incorrect mounting configuration (marine engines have different mounting requirements than industrial / mobile)
- External components (ECM if separately documented, harness, exhaust manifold beyond OE, starter, alternator, water pump, marine gear / industrial gearbox if separate, accessories) unless itemized
- Labor expenses of any kind
To start a warranty claim, reach us within 15 days of delivery at (855) 634-4447.
- All 6 Cylinders Tested: Compression results documented before payment
- Donor Application Confirmed: Marine, construction, mining, oil and gas, agriculture, forestry, rail, or generator
- Hours on Engine Documented: From ECU data or service log
- Electronic Unit Injection Verified: EUI function tested
- Turbocharger and Aftercooler Assessed: Condition documented
- 15 Day Replacement Cover: Internal defects protected from delivery onward
Additional information
| aspiration | Turbocharged and aftercooled |
|---|---|
| bore-x-stroke | 145 mm x 183 mm |
| compression-ratio | 14.5:1 to 16.1:1 |
| cooling-system | Liquid-cooled |
| electrical-system | 24V |
| emissions | Meets various standards including EPA Tier 3 and IMO I |
| fuel-system | Electronic unit injection |
18.1L (1,105 cu in) Inline-6 turbocharged and aftercooled heavy-duty industrial diesel. The C18 is the largest of the Cat truck and industrial Inline-6 family, designed for the most demanding industrial / marine / mining / oil and gas applications. Features ACERT technology (Advanced Combustion Emission Reduction Technology), electronic unit injection, turbocharging with aftercooling, robust cast iron block, and Cat ET diagnostic interface. EPA Tier 3 and IMO I emissions compliance. Power output up to several hundred HP depending on configuration.
The largest displacement Cat Inline-6, top of the family. The Cat Inline-6 lineage: 3306 (our vaz95 listing, 10.5L medium-duty heritage), 3406B mechanical (our vaz61 listing, 14.6L mechanical Class 8 and industrial), 3406E electronic (our vaz83 listing, 14.6L electronic successor), C12 (our vaz89 listing, 12L mid-displacement), C15 (our vaz85 listing, 15.2L Class 8 highway flagship before CAT exited on-highway in 2010), and C18 (this listing, 18.1L industrial successor with largest displacement). Each targets specific applications by displacement and duty cycle.
Industrial / marine / mining / oil and gas / agriculture / forestry / rail / generator. Marine: Sunseeker 95, Westport 112, Viking 92, Hatteras M90 luxury yachts; commercial workboats / supply vessels / ferries. Construction: Cat 374 excavator, 988K and 992K wheel loaders, D9T dozer. Mining: Cat 785 mining truck, D11 dozer. Oil and gas: Schlumberger QHSE frac pumps, Nabors PACE-X800 drilling rigs, Schramm T200XD. Agriculture: Case IH Steiger 620, John Deere S790 combine, Challenger MT875E, Fendt 1100 Vario MT. Forestry: Tigercat LH855E, Morbark 6400XT. Rail: EMD GT46AC auxiliary. Generators: Cat XQ570, XQ2000, C18 ACERT.
Advanced Combustion Emission Reduction Technology. Cat ACERT is the proprietary emissions strategy combining variable valve actuation, electronic unit injection optimization, advanced air management, and refined aftertreatment to meet EPA Tier 3 (off-highway) and IMO I (marine) emissions standards. ACERT is Cat alternative emissions approach to the SCR / urea injection strategy used by some competing OEMs, developed for Cat industrial and off-highway diesels of the C9 / C13 / C15 / C18 family.
Caterpillar Electronic Technician interface. Cat ET (Electronic Technician) is the proprietary Cat diagnostic interface for reading engine ECU data, running diagnostic tests, programming calibrations, and monitoring engine parameters in real time. Cat ET requires the Cat communication adapter and ET software, used by Cat dealers and certified Cat service shops. We document ECU calibration via Cat ET on every C18 we ship and report any diagnostic codes from the donor application.
Different ECU calibrations, accessories, and emissions configurations. The C18 industrial / mobile variants are configured for off-highway use with EPA Tier 3 emissions calibration, mobile accessory mounting, and intermittent duty cycles. The C18 marine variants are configured for IMO I emissions compliance, marine accessory mounting (water-cooled exhaust manifolds, marine heat exchangers, marine gear interface), and continuous duty cycles. The C18 generator variants are configured for prime power or standby duty cycles with generator-specific governor calibration. Tell us your destination application when ordering for correct configuration matching.
Hours on engine from ECU or service log, donor application disclosure, ECU calibration documented, all inspection findings recorded. We provide hours-on-engine from ECU data via Cat ET interface or from service log records where available. Donor application is disclosed (marine vs construction vs mining vs oil and gas vs agriculture vs forestry vs rail vs generator). ECU calibration is documented for matching to destination application. All compression test results, EUI inspection findings, turbocharger and aftercooler condition, and oil pressure verification are provided before payment.
No. There is no core return required.
2 reviews for Caterpillar C18 Engine for Sale | OEM Used 18.1 Liter (1,105 cu in) Inline-6 Turbocharged and Aftercooled Heavy-Duty Industrial Diesel
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Sebastian H. –
Got a Cat C18 for a Cat 988K wheel loader replacement after the original engine reached end of life at approximately 28,000 hours. Donor application correctly identified as construction (Cat 988K wheel loader equivalent), hours on engine documented from ECU data via Cat ET, all 6 cylinders compression tested, electronic unit injection function verified, turbocharger and aftercooler condition assessed clean. Honest pre-purchase information about ACERT technology and EPA Tier 3 emissions compliance, plus the Cat Inline-6 family context (3306 per vaz95, 3406B per vaz61, 3406E per vaz83, C12 per vaz89, C15 per vaz85 highway flagship, C18 industrial largest displacement).
Maximilian R. –
Sourced a Cat C18 marine variant for a luxury yacht repower project (Sunseeker 95 equivalent). Donor application correctly identified as marine (IMO I emissions configuration with marine heat exchanger), hours on engine documented, EUI function verified, ACERT operation confirmed via Cat ET diagnostic interface. Honest pre-purchase information about the difference between C18 industrial and marine configurations (different ECU calibrations, accessories, emissions) and the rebuilt cost savings vs new C18 long blocks.