Cummins NHC 250 Diesel Engine: Specs, Configuration, and Service Intervals

Cummins NHC 250 Diesel Engine Specs

The Cummins NHC 250 diesel engine is a powerful and reliable engine that has been widely used in various applications, including military vehicles, construction equipment, and marine vessels. This article provides detailed specifications of the Cummins NHC 250 engine, including its configuration, engine oil specs, and service intervals.

Engine Configuration

The Cummins NHC 250 diesel engine is an inline six-cylinder engine with a displacement of 14.0 liters. It features a cast-iron block and cylinder head, providing excellent durability and heat dissipation. The engine is naturally aspirated, meaning it does not have a turbocharger or supercharger.

The compression ratio of the Cummins NHC 250 engine is 16.5:1, allowing for efficient combustion and power delivery. It has a bore of 140 mm and a stroke of 152 mm, resulting in a smooth and balanced engine operation.

Engine Oil Specs

Proper engine lubrication is crucial for the longevity and performance of the Cummins NHC 250 engine. Here are the recommended engine oil specifications:

• Oil Type: The Cummins NHC 250 engine requires a high-quality diesel engine oil that meets the specifications of Cummins CES 20072 or API CI-4. These oils provide excellent protection against wear, deposits, and oxidation.
• Viscosity: The recommended viscosity grade for the engine oil is SAE 15W-40. This viscosity ensures proper lubrication in a wide range of operating temperatures.
• Oil Capacity: The engine oil capacity of the Cummins NHC 250 engine is approximately 37 liters (9.8 gallons).

It is essential to use the recommended engine oil and change it at the specified intervals to maintain optimal engine performance and reliability.

Service Intervals

Regular maintenance and service are vital to keep the Cummins NHC 250 engine in top condition. Here are the recommended service intervals for various engine components:

• Engine Oil and Filter: The engine oil and filter should be changed every 250 hours of operation or every six months, whichever comes first.
• Fuel Filter: The fuel filter should be replaced every 500 hours of operation or every year, whichever occurs first.
• Air Filter: The air filter should be inspected every 250 hours of operation and replaced if necessary. A clean air filter ensures proper airflow and engine performance.
• Coolant: The engine coolant should be tested and replaced as per the manufacturer’s recommendations. Regular coolant maintenance helps prevent overheating and corrosion.
• Valve Lash Adjustment: The valve lash should be checked and adjusted every 1,000 hours of operation or every two years.

Following these service intervals will help ensure the longevity and reliability of the Cummins NHC 250 engine, allowing it to deliver optimal performance in various applications.

In conclusion, the Cummins NHC 250 diesel engine is a robust and reliable powerplant. By following the recommended engine oil specifications and service intervals, you can ensure its optimal performance and longevity in various applications.