ISB6.7 for Motorhome (EPA 2010)


ISB6.7 for Motorhome (EPA 2010)
Every Start.

Reliable, durable and the most fuel-efficient engine in the industry, Cummins ISB platform has been a mainstay of the RV industry for years.

We've kept what has made this engine so successful and enhanced it.  The ISB6.7 features a High Pressure Common Rail (HPCR) fuel injection system that enables multiple injection events per cycle for cleaner, quieter and more complete combustion.  The proprietary VGT™ Turbocharger has been improved as well for strong throttle response and dependability.

A 90% reduction in NOx has been achieved through the addition of SCR to the Cummins Aftertreatment System.  This has allowed us to reduce the amount of cooled EGR into the power cylinder and recalibrate the ISB6.7 for greater responsiveness while maintaining our fuel economy leadership.

And that's just a few of the features the ISB6.7 has to offer.  It is designed to keep your maintenance to a minimum while delivering big performance results.

One-page Quick Reference Guide (Maintenance).

All backed by the best customer support in the business.

Plus, you get exclusive Cummins programs like Coach Care™ to meet your service needs as you travel across North America in your motorhome. All backed by the most extensive customer support network in North America.

For Cummins-branded merchandise, electronic tools, literature and more, visit our PowerStore web site.


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  150-268 kW 
Peak Torque  520-800 lb-ft  705-1085 N•m 
Governed Speed  2600/2800 rpm  
Clutch Engagement Torque  400 lb-ft  542 N•m  
Number of Cylinders 
Oil System Capacity  4 U.S. gallons  15 liters 
System Weight  1,340 lb  608 kg 
Engine (Dry)  1,150 lb  522 kg 
Aftertreatment System*  190 lb  86 kg 
*Increase over standard muffler and does not include chassis OEM-supplied components

Engine Finder Specifications

Certification Level EPA 2010
Power 300 - 360 hp / 224 - 268 kW
Torque 660 - 800 lb-ft / 895 - 1085 N•m


Engine Model  Advertised Horsepower (kW)  Peak Torque lb-ft (N•m) @ rpm  Governed Speed 
ISB6.7 XT 360 (268) 

800 (1085) @ 1800 

ISB6.7 340 340 (254) 

660  (895) @ 1600 

ISB6.7 340 AD 340 (254) 

660  (895) @ 1600 

ISB6.7 325 325 (243) 

750 (1017) @ 1800 

ISB6.7 300 300 (224)

660  (895)  @ 1600

ISB6.7 300 AD 300 (224) 

660  (895) @ 1600



VGT™ Turbocharger - Enhanced response and control with electric actuation for an infinite adjustment, providing exact boost across the operating range. Sliding-nozzle design increases reliability and durability.

Lowest Cost Of Operation - Reduced maintenance, long service intervals and the best fuel efficiency of any engine in its class add up to superior lifetime value. 

HPCR Fuel System - Delivers a precise mixture of fuel and air at a constant pressure, regardless of engine rpm.  This flexibility in injection timing allows multiple injection events per cycle.

Cooled EGR - Next-generation system lowers combustion temperatures for reduced emissions and optimized fuel economy.

Fully Integrated Electronic Controls - A single, higher-capacity Electronic Control Module (ECM) controls everything from air intake to exhaust aftertreatment for peak performance and near-zero emissions.

Cummins Aftertreatment System - The proven Cummins Particulate Filter reduces particulate matter by over 90%. In 2010 it is combined with Cummins Selective Catalytic Reduction (SCR) to meet emission standards while maintaining best-in-class performance, reliability and durability.


Maintenance Item  Miles / Kilometers  Hours  Months 
Oil and Filter*  15,000 mi
24,000 km



Primary Fuel Filter**  15,000 mi
24,000 km 



Secondary Fuel Filter  15,000 mi
24,000 km 



Coolant Filter  None***



Overhead Adjustment  150,000 mi
241,500 km



Standard Coolant Change****  60,000 mi
96,000 km 



Coalescing Filter  Every 3rd to 4th Oil Change Interval 
DEF Filter 200,000 mi (320,000 km)   6,500  
Particulate Filter  200,000 - 400,000 mi (320,000 - 640,000 km)   6,500  

*Assuming normal duty cycle
**OEM supplied, intervals may vary
***If engine is equipped with an optional coolant filter, it will need to be replaced on the same intervals as the oil filter.
****Extended coolant and drain/fill/flush intervals may be followed when certain requirements are met.  For more information on these requirements, refer to the Cummins Coolant Requirements and Maintenance Service Bulletin 3666132.

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

Brochures Available

Title Bulletin Number Request View  
Diesel Versus Gasoline RV Flyer 4971524 Request View  Download
ISB6.7 300 For RV Applications Spec Sheet (EPA 2010) 4971283 Request View  Download
ISB6.7 340 For RV Applications Spec Sheet (EPA 2010) 4971284 Request View  Download
ISB6.7 XT For RV Applications Spec Sheet (EPA 2010) 4971285 Request View  Download
Motorhome Engines For EPA 2010 Brochure 4971267 Request View  Download
SmartSaver6 Injector Kit For ISB5.9 And ISB6.7 Engines Flyer 2878929 Request View  Download
SmartSaver6 Injector Kit For ISB5.9 And ISB6.7 Engines Flyer - French 2878936 Request View  Download