ISB6.7 for Motorhome (2013)


ISB6.7 for Motorhome (2013)

The Most Popular Diesel Engine For RVs.

For years, no engine has combined proven reliability, power and towing capacity, fuel economy and high resale value better than the Cummins ISB6.7. Modifications to the turbocharging and control system have enabled lower emissions while delivering better fuel economy than that of prior models, lowering operating costs and leaving more dollars in your budget for trips you enjoy.

A Cummins-designed and manufactured aftertreatment system is fully integrated, and includes On-Board Diagnostics that continuously monitor engine and aftertreatment performance to ensure near-zero emissions.

Customizing the performance of your engine is possible through the use of Cummins PowerSpec, an online tool that lets you adjust operating parameters to match your need for enhanced fuel economy, higher performance or a balance between the two. See for details.

All of this is backed by unmatched support from the largest service network in North America, including the exclusive Coach Care™ program and 24/7/365 assistance from Cummins Care representatives at 1-800-DIESELS™ (1-800-343-7357).

For Cummins-branded merchandise, electronic tools, literature and more, visit the PowerStore.


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, Motorhome

See ISB PowerSpec Engine Features


Advertised Horsepower

200-360 hp

149-268 kW

Peak Torque

520-800 lb-ft

705-1,485 N•m

Governed Speed

2,600 rpm

Clutch Engagement Torque

400 lb-ft

542 N•m

Number of Cylinders


Biodiesel Compatibility

Up to B20

System Weight (dry)

1,357 lb

616 kg

Engine Finder Specifications

Certification Level EPA 2013
Power 200 - 360 hp / 149 - 268 kW
Torque 520 - 800 lb-ft / 705 - 1085 N•m


Engine Model

Advertised Horsepower (kW)

Peak Torque lb-ft (N•m) @ rpm

ISB6.7 360

360 (268)

800 (1085) @ 1800

ISB6.7 340AD*

340 (254)

700 (949) @ 1600

ISB6.7 340

340 (254)

660 (895) @ 1600

ISB6.7 325

325 (242)

750 (1017) @ 1800

ISB6.7 300AD*

300 (224)

660 (895) @ 1600

ISB6.7 300

300 (224)

660 (895) @ 1600

ISB6.7 250AD*

250 (186)

660 (895) @ 1600

ISB6.7 240 AD*

240 (179)

560 (759) @ 1600

ISB6.7 220 AD*

220 (164)

520 (705) @ 1600

ISB6.7 200 AD*

200 (149)

520 (705) @ 1600

*does not have an air compressor


High Pressure Common Rail (HPCR) Fuel System – High injection pressures produce quick throttle response at every rpm, for safe entry onto highways. Optimized timing increases fuel efficiency while lowering emissions.

VGT™ Turbocharger From Cummins Turbo Technologies – This patented design is widely recognized as the industry leader for performance. Electric actuation provides quick throttle response and increased braking horsepower.

Cooled Exhaust Gas Recirculation (EGR) – The next-generation system lowers combustion temperatures for reduced emissions and optimized fuel economy.

High-Capacity Electronic Control Module (ECM) – A single ECM manages the entire engine and aftertreatment system for optimum performance and fuel economy. This ECM is used across the board for Cummins on-highway engines, to simplify servicing.

Cummins Aftertreatment System From Cummins Emission Solutions – This proprietary system consists of a Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) technology, for near-zero emissions.

Fleetguard®Fuel Filters, Lube Filters And Diesel Exhaust Fluid (DEF) From Cummins Filtration – Fleetguard filters protect against corrosion and contaminants that can cause performance issues. High-quality DEF is readily available at all Cummins distributors, within Cummins Filtration’s vast North American distribution network and at major service stations and truck stops.


Duty Cycles

Miles/ Kilometers


Oil and Filter

15,000 miles / 24,000 km


Fuel Filter*

15,000 miles / 24,000 km


Standard Coolant Change

60,000 miles / 96,000 km


Overhead Adjustment

150,000 miles / 240,000 km


Coalescing Filter

Every 3rd to 4th oil change


DEF Filter

200,000 miles / 320,000 km


Particulate Filter Cleansing

200,000 miles / 320,000 km


*with appropriate air filter

Brochures Available

Title Bulletin Number Request View  
2013 ISB6.7 For RV Applications Spec Sheet 4971463 Request View  Download
2013 RV Applications Brochure 4971462 Request View  Download
Diesel Versus Gasoline RV Flyer 4971524 Request View  Download