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Cummins 4BT 3.9 and 6BT 5.9 Engine Parts

Cummins B Series Engine Parts

Diesel Parts Direct has everything you need for Cummins B Series engines. Whether it’s a full engine rebuild for a 5.9 Cummins 6BT or simple maintenance for a 4BT 3.9 diesel engine, we’ve got the parts and supplies to keep your fleet humming. Check our inventory to find an extensive selection of 3.9 and 5.9 Cummins parts ready for shipment. What’s more, no matter if you prefer OEM or aftermarket parts, all come with a one-year manufacturer’s warranty.

In addition to parts for the Cummins B Series, Diesel Parts Direct has the knowledge to help you keep your equipment operating. From help selecting the right parts for your 6BT and 4BT engines to making last minute order changes, our goal is to maximize your uptime.

Keep your B Series engines up and operating with Diesel Parts Direct.



Find Cummins B Series Parts



We carry a large assortment of aftermarket, genuine, and remanufactured parts for Cummins 4BT 3.9 and 6BT 5.9 diesel engines, including turbochargers, overhaul kits, injectors, and lift pumps.

For more information on B Series 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.

Get a Quote

Hundreds Of Items Guaranteed in Stock
Hundreds Of Items Guaranteed in Stock Click here for details
Great Selection of Block Heaters and Glow Plugs

GREAT SELECTION OF BLOCK HEATERS AND GLOW PLUGS

Everyday Free Ground Shipping on Select Overhaul Kits and Turbos
Everyday Free Ground Shipping on Select Overhaul Kits and Turbos Click here for details

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