Cat C18 Marine Engines

High performance marine diesel engines developed to deliver exceptional torque and dependable propulsion for demanding marine operations.

Where High Torque Meets Lasting Endurance

The ability to generate strong torque throughout the operating range is one of the defining characteristics of an effective marine propulsion system. The Cat C18 Marine Engine is engineered to deliver this capability while maintaining smooth power delivery, efficient fuel utilization, and dependable reliability under sustained workloads. Built on a robust inline six cylinder platform with advanced electronic engine controls and precision fuel management, the C18 performs confidently across a wide range of operating conditions. Its proven capabilities make it a preferred propulsion solution for sportfishing boats, motor yachts, commercial fishing vessels, offshore support craft, passenger vessels, and other marine applications where consistent pulling power and operational confidence are essential.

Explore the Cat C18 Series

* Cat C18 715
* Cat C18 803
* Cat C18 873
* Cat C18 1000
* Cat C18 1136
* Cat C18 1150
* Cat C18 1200
* Cat C18 1223

Engineered to Sustain Performance Beyond the Horizon

Marine propulsion is tested over thousands of operating hours rather than a single journey. The Cat C18 is developed to maintain dependable output through changing sea conditions, extended duty cycles, and demanding commercial workloads while supporting efficient operation and long service life. Its combination of durable construction, intelligent engine management, and refined combustion technology allows operators to achieve consistent performance with the confidence expected from one of Caterpillar’s most respected marine engine platforms.