: The engine features an alloy cast iron block and head, forged-steel internals, and large bearings designed for extreme durability.
: 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. Cummins Engine Nt855 Manual
: 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. : The engine features an alloy cast iron
: 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. which is ideal for remote locations.