What Is a Cummins NT855?

The Cummins NT855 is one of the most recognized and reliable diesel engines ever produced by Cummins. Known for its durability, high torque output, and long service life, the NT855 has been widely used in heavy-duty applications such as construction machinery, mining equipment, marine vessels, and power generation systems.

At its core, the Cummins NT855 is a 14-liter, six-cylinder, four-stroke diesel engine. It belongs to the legendary Cummins “N Series,” which has earned a global reputation for performance and dependability since the mid-20th century. Depending on configuration and tuning, the NT855 can deliver power outputs ranging from 240 to over 400 horsepower, making it suitable for both stationary and mobile heavy equipment.

One of the key strengths of the NT855 lies in its robust mechanical design. The engine features a sturdy cast-iron block, efficient turbocharging, and a mechanical fuel injection system that ensures consistent performance even under harsh working conditions. Many operators appreciate its easy maintenance and worldwide parts availability, which reduce downtime and operational costs.

In industrial and marine applications, the NT855 continues to prove its value as a workhorse engine. Even though newer electronic models like the Cummins QSX and QSM series have taken over in modern equipment, the NT855 remains in service across the world due to its simplicity, reliability, and field repairability.

In summary, the Cummins NT855 is more than just an engine—it’s a symbol of Cummins’ engineering excellence. Its blend of power, endurance, and practicality has made it a trusted choice for operators who demand consistent performance in the toughest environments.