: 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 cylinder liners are "wet," meaning they are in direct contact with coolant for better heat dissipation. This design allows for easier rebuilds because the liners can be replaced without needing to machine the engine block. Cummins Engine Nt855 Manual
: 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. : The manual's maintenance schedules support an engine
: 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
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
: The engine features an alloy cast iron block and head, forged-steel internals, and large bearings designed for extreme durability.