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B-series Hi3qtr

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.
Engine ModelAdvertised hp (kW) @ rpmPeak hp (kW) @ rpmPeak Torque lb-ft (N•m) @ rpmAspiration
B5.9
B5.9-173173 (129) @ 2500173 (129) @ 2300530 (719) @ 1500Turbo & Charge Air Cooled
B5.9-173173 (129) @ 2200177 (132) @ 2000580 (786) @ 1300Turbo & Charge Air Cooled
B5.9-165165 (123) @ 2500165 (123) @ 2300494 (670) @ 1500Turbo & Charge Air Cooled
B5.9-165165 (123) @ 2200165 (123) @ 2000524 (710) @ 1300Turbo & Charge Air Cooled
B5.9-152152 (113) @ 2500152 (113) @ 2300453 (614) @ 1500Turbo & Charge Air Cooled
B5.9-150**150 (112) @ 2200150 (112) @ 2000467 (633) @ 1300Turbo & Charge Air Cooled
B4.5
B4.5-9999 (74) @ 2500104 (78) @ 2300305 (414) @ 1500Turbocharged
B4.5-9999 (74) @ 2200104 (78) @ 2000305 (414) @ 1500Turbocharged
B4.5-92**92 (69) @ 220097 (72) @ 2000300 (407) @ 1500Turbocharged
B4.5-80*80 (60) @ 250085 (63) @ 2300222 (301) @ 1300Naturally Aspriated
B4.5-8080 (60) @ 220080 (60) @ 2100217 (294) @ 1300Naturally Aspriated
B3.9
B3.9-125125 (93) @ 2200125 (93) @ 2100373 (506) @ 1300Turbo & Charge Air Cooled
B3.9-110110 (82) @ 2500110 (82) @ 2300346 (469) @ 1500Turbo & Charge Air Cooled
B3.9-110**110 (82) @ 2200110 (82) @ 2000365 (495) @ 1300Turbo & Charge Air Cooled
*Indicates a restricted rating.
**Indicates continuous rating.

All ratings are intermittent unless otherwise noted.

Additional ratings may be available. Check with your Cummins distributor or dealer.

 

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.
Specifications.
 B3.9B4.5B5.9
Advertised Horsepower110-125 hp82-93 kW80-99 hp60-74 kW150-173 hp112-129 kW
Peak Torque346-373 lb-ft469-506 N•m217-305 lb-ft294-414 N•m453-580 lb-ft614-786 N•m
Cylinders446
Oil System Capacity11.5 U.S. qt10.9 liters11.5 U.S. qt10.9 liters17.2 U.S. qt16.3 liters
Length30.6 in777 mm30.6 in777 mm40.0 in1016 mm
Width24.6 in625 mm24.6 in625 mm24.9 in632 mm
Height37.7 in958 mm35.5 in902 mm35.5 in963 mm
Weight (wet)745-782 lb338-355 kg721-745 lb327-338 kg952-997 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

Cummins B Series engines are the ultimate in design flexibility, with literally hundreds of application options to satisfy the specific demands of virtually every piece of construction equipment in every kind of work environment. These include:
  • Flywheels
  • Flywheel housings
  • Starters
  • Oil fill options
  • Alternators
  • Oil pans
  • Air-handling options
  • Cooling system options
  • Accessory drive mounting options
  • Fan drive options
  • Plus, noise-reduction packages that eliminate up to 4.5 dBA of acoustic output
Maintenance Intervals.

B Series engines have been designed for reduced maintenance with plateau-honed cylinders, an innovative ring pack design and edge-molded gaskets for significantly reduced oil consumption. With Cummins B Series, little or no top-off oil should be needed. Oil change intervals can be extended up to 500 hours. And the B Series uses durable, reliable rotary fuel pumps for strong performance in every kind of weather condition.

 
For complete maintenance information, please consult your Owner's Manual or Operations and Maintenance Manual.

Cummins B Series engines come with a full 2-year/2,000-hour warranty that covers all Cummins branded components, including Cummins branded electrics such as starters and alternators. Major components coverage continues into the third year, up to 10,000 hours of operation from the time your B Series engine goes into service.

Three simple steps explain everything you need to know:

Step One: Full coverage on all Cummins industrial engines and branded components with unlimited hours during the first year of operation. This includes Cummins branded electrics such as alternators, starters, etc.

Step Two: Full coverage is extended for the second year, up to 2,000 hours of operation. Total hours are cumulative from the time the engine goes in service.

Step Three: Major components coverage including block, crankshaft, camshaft and rods on all products for the third year or up to 10,000 hours of operation. Total hours are cumulative from the time the engine goes in service.

For complete warranty details, please see the US and Canadian warranty brochure (3381321) or International warranty brochure (3381322).

 

Getting every installation right - the first time - is what Cummins Advisor is all about. Advisor software builds a virtual model to make sure every system (air, intake, exhaust, cooling) is integrated for optimum performance. It takes into account everything from load factors to operating climates to duty cycles - then identifies systems or components that could negatively impact reliability - listing alternatives that will deliver the performance you expect the first time - every time.