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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.

Find Parts for Cummins ISB and QSB Engines

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.

If you need assistance, please Request a Quote or Contact Us now and have any of our knowledgeable inside sales staff assist you. Thank you for your support.

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