
PRODUCT Detail
In every corner of the globe and every construction zone, chances are good that you’ll find Cummins B Series engines hard at work. Over 3 million B Series engines are currently in use, from chippers to welders to skid steer loaders. Our mechanical B series engines are small enough to fit the equipment but big enough to handle the job. Three different models are available, the four-cylinder B3.9 and B4.5 plus the 6-cylinder B5.9. Ratings range from 80-173 hp, with varying combinations of turbocharging, natural aspiration and charge air cooling for optimal performance. Plus, the B Series is designed to minimize downtime for maintenance.
With literally hundreds of application options, getting the right combination of standard features and options for your equipment sounds difficult, but Cummins Advisor makes getting it right the first time a lot easier.
Every B Series engine comes with a base warranty.
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.
B3.9 | B4.5 | B5.9 | |
Advertised Horsepower | 110-125 hp82-93 kW | 80-99 hp60-74 kW | 150-173 hp112-129 kW |
Peak Torque | 346-373 lb-ft469-506 N•m | 217-305 lb-ft294-414 N•m | 453-580 lb-ft614-786 N•m |
Cylinders | 4 | 4 | 6 |
Oil System Capacity | 11.5 U.S. qt10.9 liters | 11.5 U.S. qt10.9 liters | 17.2 U.S. qt16.3 liters |
Length | 30.6 in777 mm | 30.6 in777 mm | 40.0 in1016 mm |
Width | 24.6 in625 mm | 24.6 in625 mm | 24.9 in632 mm |
Height | 37.7 in958 mm | 35.5 in902 mm | 35.5 in963 mm |
Weight (wet) | 745-782 lb338-355 kg | 721-745 lb327-338 kg | 952-997 lb432-452 kg |
Painstaking attention to details in the design makes every B Series engine reliable and durable. They’ll be on the job, ready to start every morning for years to come. Heavy-duty components include:
- Forged steel camshafts and crankshafts
- Plateau-honed cylinder liners
- Holset wastegated turbochargers
- A parent-bore cylinder block built to handle high pressures
- Rotary fuel pumps
- Edge-molded gaskets
- And more

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