Cummins 4BT 3.9/6BT 5.9 Camshafts are a vital component in the engine of a truck that controls the opening and closing of the engine’s valves. The camshaft is designed to rotate at half the speed of the crankshaft and has lobes or protrusions that push on rocker arms or lifters, which in turn open and close the valves. This process allows for air and fuel to enter the combustion chamber and for exhaust gases to exit. The specific part number may differ based on the make and model of the truck, but all camshafts serve an essential function in controlling valve operation for optimal engine performance.

We carry Genuine and Aftermarket camshafts and bearing assemblies for Cummins 3.9 and 5.9-liter engines. For your convenience, you can access our inventory through the product links listed below.

If you do not see the B Series part you need, please use our quote request form or call us at +86 18027472559 our friendly sales staff will gladly help you.