B Series for Construction (Tier 2)

Overview

B Series for Construction (Tier 2)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.

Specifications

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.
  B3.9 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

Engine Finder Specifications

Markets
Certification Level Tier 2 / Stage II
Power 80 - 173 hp / 60 - 129 kW
Torque 217 - 580 lb-ft / 294 - 786 N•m

Ratings

Engine Model Advertised hp (kW) @ rpm Peak hp (kW) @ rpm Peak Torque lb-ft (N•m) @ rpm Aspiration
B5.9
B5.9-173 173 (129) @ 2500 173 (129) @ 2300 530 (719) @ 1500 Turbo & Charge Air Cooled
B5.9-173 173 (129) @ 2200 177 (132) @ 2000 580 (786) @ 1300 Turbo & Charge Air Cooled
B5.9-165 165 (123) @ 2500 165 (123) @ 2300 494 (670) @ 1500 Turbo & Charge Air Cooled
B5.9-165 165 (123) @ 2200 165 (123) @ 2000 524 (710) @ 1300 Turbo & Charge Air Cooled
B5.9-152 152 (113) @ 2500 152 (113) @ 2300 453 (614) @ 1500 Turbo & Charge Air Cooled
B5.9-150** 150 (112) @ 2200 150 (112) @ 2000 467 (633) @ 1300 Turbo & Charge Air Cooled
B4.5
B4.5-99 99 (74) @ 2500 104 (78) @ 2300 305 (414) @ 1500 Turbocharged
B4.5-99 99 (74) @ 2200 104 (78) @ 2000 305 (414) @ 1500 Turbocharged
B4.5-92** 92 (69) @ 2200 97 (72) @ 2000 300 (407) @ 1500 Turbocharged
B4.5-80* 80 (60) @ 2500 85 (63) @ 2300 222 (301) @ 1300 Naturally Aspriated
B4.5-80 80 (60) @ 2200 80 (60) @ 2100 217 (294) @ 1300 Naturally Aspriated
B3.9
B3.9-125 125 (93) @ 2200 125 (93) @ 2100 373 (506) @ 1300 Turbo & Charge Air Cooled
B3.9-110 110 (82) @ 2500 110 (82) @ 2300 346 (469) @ 1500 Turbo & Charge Air Cooled
B3.9-110** 110 (82) @ 2200 110 (82) @ 2000 365 (495) @ 1300 Turbo & 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.

Features

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

Maintenance

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.

Brochures Available

Title Bulletin Number Request View  
B Series for Off-Highway Applications Spec Sheet (Tier 2) 4087025 Request View  Download
Encompass Tri-Fold Mailer 3624570 Request View  Download