B Series for Construction (Tier 2)

For everyday performance, every month and every year, Cummins B Series engines are tough to beat. Whether you're laying down hot asphalt on a sweltering summer afternoon or digging a trench in the middle of winter, Cummins B Series has the power you need and the reliability you demand.

The B3.9 shares the same technology platform with the B5.9, our most popular engine ever, with performance optimized across a wide power band.

The B4.5 is identical in exterior dimensions to the B3.9 but features a longer stroke for more power and better low-end torque. It is offered with a choice of natural aspiration or turbocharging, to meet your power demands.

The B5.9 is a six-cylinder in-line design that uses 40% fewer parts than traditional diesels, thanks to its unitized design. Like all B Series engines, it is a proven power plant with mechanical fuel injection that meets ecological concerns in a highly efficient package.