Cummins Bare Engine Assembly NT855 cylinder block for construction equipment

The Cummins NT855 series is an enduring classic in the global heavy-duty machinery power sector. As a large-displacement, inline-six heavy-duty engine, it maintains a significant market share in mining, construction, and industrial sectors thanks to its robust mechanical structure, massive torque output, and ease of maintenance. Its "bare engine assembly" typically comprises core components such as the cast-iron cylinder block, cylinder head, crankshaft, connecting rods, pistons, and camshaft.

Engine Configuration: Inline-six cylinder, 4-stroke, 14-liter (855 cu in) displacement

Cooling System: High-efficiency, heavy-duty water cooling system

Rated Power: Approximately 200–450 kW (270–600 hp), depending on turbocharging configuration and application calibration

Fuel System: Cummins PT (Pressure-Time) fuel system—the series' core mechanical technological advantage; it relies entirely on mechanical injection without complex electronic controls, ensuring exceptional performance stability.

Key Advantages:

Classic Structure: Fully mechanical design allows for maintenance using simple tools, even in remote operating areas with limited infrastructure.

Superior Adaptability: Unfussy regarding fuel quality, highly resilient to harsh environments, and features long maintenance intervals with very low repair costs.

Ample Torque Reserve: Delivers outstanding performance in heavy-duty excavation and dozing operations, providing smooth and sustained power output.

Primary Applications: Heavy-duty mining trucks, excavators, bulldozers, road rollers, large industrial generator sets, and marine propulsion.

Guangzhou Jianming Machinery Equipment Co., Ltd.

With 20 years of solid practical experience, we are experts in the field of machinery power systems and components.

We began as a small machinery repair shop. Over the past two decades, we have accumulated a wealth of successful global case studies and maintenance expertise. Drawing on our frontline experience in resolving complex mechanical issues, we have earned widespread acclaim and grown into a comprehensive enterprise employing over 200 professionals. We deeply understand the challenges equipment faces under extreme conditions and possess extensive practical experience and expertise in the following areas:

**Power Upgrades and Retrofitting for Heavy Machinery:** We provide customized engine replacement and overhaul solutions for various types of construction machinery, with specialized expertise in the refurbishment and tuning of classic platforms such as the Cummins NT855.

**Mining and Industrial Equipment Maintenance:** We offer professional power optimization strategies to ensure equipment maintains continuous operational capability under heavy loads and harsh conditions.

**Agricultural and Irrigation Power Systems:** We provide power unit upgrades and comprehensive troubleshooting services for a wide range of large-scale agricultural machinery and irrigation/drainage equipment.

Leveraging our extensive technical experience, we are also a robust supplier of spare parts:

**Comprehensive Supply of Mechanical Parts:** We offer a wide selection of carefully curated heavy machinery parts—including PT fuel pumps, cylinder head assemblies, piston and connecting rod kits, precision bushings, and engine overhaul gasket sets—to fully meet your one-stop procurement needs.

Our wealth of practical experience and robust supply chain system are our most valuable assets. Whether you are facing complex mechanical challenges or require reliable spare parts, Jianming Machinery possesses the expertise to help you succeed!