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Cummins ISB and QSB Engine Parts

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Cummins ISB and QSB Engine Parts

Based on the Cummins B Series, the ISB engine was launched in 1998 and is available in 4 and 6 inline cylinder models. Design innovations include a 24-valve setup and the Interact electronic engine management system, both contributing to increased fuel efficiency and meeting emission regulations.

A few years later, the QSB (Quantum System) was introduced to comply with even stricter U.S. Environmental Protection Agency standards.

ISB engines are used in light-duty trucks and emergency vehicles; QSB models are utilized in marine, agricultural, and construction applications as well.


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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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Find Parts for Cummins ISB and QSB Engines



We carry a large assortment of new and remanufactured parts for ISB 3.9, ISB 5.9, QSB 4.5, QSB 5.9, and QSB 6.7 diesel engines.

For more information on ISB/QSB engines, please visit our Cummins engine specifications page.


Hundreds Of Items Guaranteed in Stock
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