This comprehensive Cummins NT 855 Engine Big Cam III & IV Troubleshooting Factory Service Repair Manual provides detailed instructions and guidance for servicing, repairing, and maintaining your engine. It covers everything from basic engine identification and troubleshooting to complex engine system repair procedures. This manual will help you understand the cooling system, lubricating oil system, combustion air system, compressed air system, fuel system, electrical system, and base engine components. The manual also includes instructions for engine removal and installation, engine testing (in-chassis), and engine component specifics. Additionally, you will find information on additional repair literature and accessory component manufacturers. This manual is the same one used by professional technicians, mechanics, and workshops, and it is designed to be user-friendly, providing clear step-by-step instructions and detailed illustrations.

The Cummins NT855 engine, a stalwart in the world of heavy-duty trucking, is a testament to American engineering prowess. Introduced in 1987, this powerful inline-six diesel engine quickly gained popularity for its robust design, exceptional reliability, and impressive fuel efficiency. Available in various configurations with power outputs ranging from 350 to 600 horsepower, the NT855 found its home in a multitude of heavy-duty applications, including long-haul trucks, construction equipment, and even marine vessels. This engine's enduring legacy is built upon its durable, cast-iron cylinder block, forged crankshaft, and meticulously engineered components. The NT855's renowned reliability stems from its straightforward design and robust construction, making it a favorite among operators who value uptime and low maintenance costs.

The NT855's evolution saw the introduction of the "Big Cam" technology in the 1990s, significantly boosting its power and fuel efficiency. This innovative system employed larger valves and camshafts, enabling greater airflow and combustion efficiency. The "Big Cam III" and "Big Cam IV" versions further refined this technology, introducing sophisticated electronic controls and emissions management systems. These advancements ensured the NT855 remained competitive amidst evolving emission standards while maintaining its reputation for durability and performance. The "Cummins NT 855 Engines Big Cam III & IV Troubleshooting Factory Service Repair Manual" provides a comprehensive guide to understanding, maintaining, and repairing these engines. This manual is an invaluable resource for mechanics, technicians, and enthusiasts seeking in-depth knowledge of the NT855's intricate workings.