: Because of its reliable mechanical nature, it is a staple for heavy-duty trucks, marine vessels, and industrial power generators. Technical Specifications Summary Displacement 14.0L (855 cubic inches) Configuration Inline 6-cylinder diesel Horsepower 250 – 475 HP (depending on configuration) Torque 1,000 – 1,650 lb-ft Oil Capacity Approx. 11 to 15 gallons (44–57L) NTA855-G4 - Cummins
: Unlike modern engines, the NT855 lacks complex Electronic Control Modules (ECMs). This makes it significantly easier to diagnose and repair using standard mechanical tools, which is ideal for remote locations. Cummins Engine Nt855 Manual
: It uses the Cummins Pressure-Time (PT) self-adjusting fuel system, which provides accurate metering and timing through camshaft-actuated injectors. Performance and Durability : Because of its reliable mechanical nature, it
The Cummins NT855 engine is widely regarded as a legendary workhorse, and its manual highlights a "mechanical-first" design that makes it exceptionally reliable and user-friendly for heavy-duty applications. Key Design Features This makes it significantly easier to diagnose and
: The manual's maintenance schedules support an engine capable of logging over 1 million miles or 700,000 miles before a major overhaul is expected.
: The "Big Cam" evolution increased the camshaft diameter to 2.5 inches, shortening injection periods to create more torque at lower engine speeds and improving fuel efficiency.