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Cummins NH220, NH250, NT855 and NTA855

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Cummins NH and NT Series Engine Parts

The Cummins NH220, a 6-cylinder engine displacing 743 in3, was introduced in the mid 1950's. The N Series engines experienced several modifications through the years.

In 1957, displacement was increased to 855 in3. Turbochargers and aftercoolers were added later on.

In 1961, the first NH engines equipped with a compression release engine brake were produced. The "Jake brake", manufactured by Jacobs Vehicle Systems, was one one the many great innovations of founder Jessie Cummins.

The oil crisis of 1973 encouraged the creation of a fuel-saving program. The "Big Cam" was launched in 1976, when the diameter of the camshaft was increased to allow a shorter injection period and perform a more efficient combustion. The program went through several improvements over time, resulting in Big Cam Series I through IV.


Find Cummins 855 Series Parts



We carry a large assortment of aftermarket, genuine, and remanufactured parts for Cummins NT855 (big and small cam), NH220, and NH250 diesel engines, including in-frame kits, injectors, cylinder headsthermostats and oil pumps.

For more information on NH/NT engines, please visit our Cummins engine specifications page.

Need Assistance?



If you need help selecting the right Cummins part for your needs, please use our quote request form. Provide as much information as you can about the parts you require and our knowledgeable staff will promptly answer your request.

You may also call us at 855.470.3525 to inquire about current pricing and availability of our products.

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