Caterpillar C18 Marine Engines
C18 Marine Cat Key Specs
Maximum Power: 469-1001 bhp (350-747 bkW)
Rate Speed: 1800-2300 rpm

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Overview Caterpillar C18 Marine Engines
Straight or inline engines are internal combustion engines where all cylinders are aligned in a single row. They are common in four, six as well as eight cylinder configurations. A major advantage of this type of engines is their simplicity compared to horizontally opposed or even V designs. Their crankshaft and cylinder banks can be milled from the same metal casting The configuration requires fewer camshafts and cylinder heads Straight engines are usually small and can therefore be mounted in any direction The engine is much easier to maintain because most of its components and accessories are reachable from the sides rather than from the top or bottom of the cylinder banks.
The straight-six or I-6 layout is the simplest engine configuration that has both primary and secondary mechanical engine balance; and it does so without a balance shaft. It is characterized by much less vibration compared to engines with fewer cylinders.
This reduced vibration is achieved by mirroring the front and rear trio of cylinders. The pistons are designed to move in pairs, but 360out of phase; they also move on different strokes of a complete 4-stroke cycle. This eliminates the possibility of polar rocking motions. Its six crank throws are arranged in three planes with the planes offset at 120°. This way the sum of the secondary forces caused by differences in sinusoidal motion is zero. The C18 also possesses a carefully designed vibration damper that helps with absorbing torsional vibration.
Marine operators look for engines that are rugged and powerful and the I-6 is exactly that engine.
At Depco, we pride ourselves on our commitment to providing high-quality products that meet your needs. That’s why every product that enters our facility undergoes a comprehensive inspection, testing, and servicing process, known as “The Depco Way.” This includes the Caterpillar C18 marine engine, which undergoes rigorous testing to ensure that it meets our high standards of quality and reliability.
Product Specifications for C18 Marine Engine
Specifications
Power Range | 1015-1150 mhp, 1001-1136 bhp, 747-847 bkW |
Rated Speed | 2300 rpm |
Engine Configuration | In-line 6, 4-Stroke-Cycle Diesel |
Bore | 5.7 in |
Stroke | 7.2 in |
Rotation from Flywheel End | Counterclockwise |
Length - Maximum | 76 in |
Width - Maximum | 47.4 in |
Height - Maximum | 51.2 in |
Features
Air Inlet System
- Aftercooler - sea water, corrosion resistant
- Air cleaner/fumes disposal (closed system)
- Turbocharger, jacket water cooled
- Front-down and rear-down aftercooler condensate drains
Control Panel
- Electronic diagnostics and fault logging
- Cold mode start strategy
- Engine and transmission monitoring (speed, temperature, pressure)
- Electronic fuel/air ratio control
- 70-pin customer connector
- Engine Protection Mode for High Ambient Conditions
- Three types of throttle inputs (primary/ secondary PWM, 0-5V, 4-20mA +/-)
Cooling System
- Sea water pump, rubber impeller, self-priming, gear driven
- Sea water aftercooled
- Jacket water pump, gear driven
- JW Heat Exchanger - Titanium plate with integral fuel cooler expansion tank, and thermostat housing (fully open temp 92C)
- Coolant recovery system
Exhaust System
- Water-cooled exhaust manifold & turbocharger
- 114.3 mm (4.5 in) ID round flanged exhaust outlet
Flywheels and Flywheel Housing
- Flywheel Housing, SAE No. 1
- Flywheel, 18 inch, 113 teeth
- SAE standard rotation
Fuel System
- Fuel filter, RH service on Port, LH service on Starboard
- Fuel transfer pump
- Fuel priming pump
- Hybrid fuel line design
Lube System
- Crankcase breather
- Oil cooler
- Oil filter, spin-on, low profile, RH service on Port, LH service on
- Oil pan, center sump
- Dipstick, RH service on Port, LH service on Starboard
- Oil pump, gear driven
Image and dimensions may not reflect actual engine.
Applications and Spec Sheets
Industrial Applications
Commercial Propulsion
Auxiliary Engines
Genset packages
Offshore Fishing
Spec Sheets Available
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