B Series for Construction (Tier 2)

Overview

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	Off-Highway Construction
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

Search Our Complete Brochure Library for More Product Information >>

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

Show all information