ISB6.7 for School Bus (2013)


ISB6.7 for School Bus (2013)
Cummins ISB6.7.
Jumping A Grade.
Cummins is ahead of the curve in developing diesel engines that deliver everything from better fuel economy to improved reliability and durability. We’re even meeting 2014 greenhouse gas (GHG) emissions standards a year ahead of schedule. That’s like being smart enough to jump a grade in school. What’s more, the ISB6.7 is the cleanest diesel engine available for the school bus market.

Better. At The Pump.
The fuel economy story is even better. Cummins ISB6.7 already provides best-in-class fuel economy, and it’s getting up to 2% better in 2013. The addition of an air intake throttle makes our EGR system more efficient. The reduction in parasitic losses increases fuel economy and lowers operating costs.

Better. For The Environment.
Cummins offers the cleanest ratings of any diesel engines in school buses. Emissions are managed by the proven Cummins Aftertreatment System. In-house development of the entire integrated unit from air handling to exhaust aftertreatment allows us to optimize engine performance and emissions control better than other engine manufacturers. The 2013 ISB6.7 will come equipped with On-Board Diagnostics to monitor performance of the aftertreatment system. The Cummins On-Board Diagnostics system has been proven in thousands of vehicles since 2007.

Better. On The Road.
There’s no compromise in performance, as the ISB6.7 is rated at 200-300 hp (149-224 kW) with up to 660 lb-ft (895 N•m) of peak torque. Multiple injection events per cycle make this engine quiet and smooth to operate, so bus drivers can be more alert and aware of traffic outside – and students inside the bus. Plus, maintenance intervals for the ISB6.7 are virtually unchanged across the board.

Better. For Years Ahead.
Our confidence in the Cummins ISB6.7 is evident in our comprehensive base warranty, one of the best in the industry, and our new extended coverage plans. Lock in up to 10 years of coverage with complete confidence in its robust design and quality manufacturing.

Better. Every Subject.
Cummins ISB6.7 is designed to deliver better performance, reliability, fuel economy and durability. It is easily customized using the many electronic engine features and adjustable parameters.  Maintenance is virtually unchanged from previous models. Plus, every ISB6.7 is backed by the largest and most capable customer support network in the business.

Considering a Cummins engine purchase? For more information including pricing and additional technical information, please contact your Cummins representative. If you need help finding a representative, the Cummins Sales and Service Locator tool can help.

Cummins PowerSpec is an electronic tool that makes it possible to tailor the operation of Cummins engines in every on-highway application.

Available for: On-Highway, School Bus

See ISB PowerSpec Engine Features


Advertised Horsepower

200-300 hp

149-224 kW

Peak Torque

520-660 lb-ft

705-895 Nm

Governed Speed

2600 rpm

Clutch Engagement Torque

400 lb-ft

542 Nm

Number of Cylinders


System Weight

1357 lb

616 kg

    Engine (Dry)

1150 lb

522 kg

    Aftertreatment  System*

207 lb

94 kg



*Increase over standard muffler and does not include chassis OEM-supplied components.

Product Finder Specifications

Certification Level EPA 2013
Power 200 - 300 hp / 149 - 224 kW


Engine Model

Advertised Horsepower (kW)

Peak Torque lb-ft (Nm) @ rpm

ISB6.7 300

300 (224)

660 (896) @ 1600

ISB6.7 280

280 (209)

660 (896) @ 1600

ISB6.7 260

260 (194)

660 (896) @ 1600

ISB6.7 250

250 (187)

660 (896) @ 1600

ISB6.7 240

240 (179)

560 (760) @ 1600

ISB6.7 220

220 (164)

520 (706) @ 1600

ISB6.7 200

200 (149)

520 (706) @ 1600


Maintenance Item




Oil & Filter

15,000 mi
24,000 km



Fuel Filter

15,000 mi
24,000 km



Standard Coolant

60,000 mi
96,000 km



Valve Adjustment

150,000 mi
240,000 km



Crankcase Breather Filter 

60,000 mi
96,000 km



DEF Filter  

200,000 mi
321,500 km



Particulate Filter

200,000 mi
321,500k m



For complete maintenance information, please consult your Owner’s Manual or Operations and Maintenance Manual, available on QuickServe Online.

Brochures Available

Title Bulletin Number Request View  
ReCon DPF For ISB Engines Flyer 5410974 Request View  Download
ReCon DPF For ISB Engines Flyer - French 5410978 Request View  Download
ReCon DPF For ISB Engines Flyer - Spanish 5410977 Request View  Download
School Bus Engines Brochure (2013) 4971393 Request View  Download