B6.7 For Motorhomes (2017)


B6.7 For Motorhomes (2017)

American ingenuity and over 30 years of continuous improvement have made the Cummins B6.7 a standard in reliability and performance for motorhomes and thousands of other applications, from RAM trucks to minehunters serving our armed forces. Because they provide higher confidence, performance and reliability, you deserve a diesel.


  • Stronger in the Hills – The B6.7 has 50 percent more torque than gasoline engines, and a standard VGT exhaust brake, all at lower rpm with less noise.
  • Peace of Mind – With a standard 5 year/100,000-milebase warranty and optional full engine coverages up toeight years, we've got you covered.
  • Longer-Lasting – Cruising easily at a lower rpm not only
    provides a quieter ride, but allows the diesel to last two to three times longer than gasoline engines.
  • Leading Fuel Economy – With up to 40 percent better fuel economy than gasoline-powered motorhomes, the B6.7 lets you choose where you stop for fuel.


  • Quiet Responsiveness – Cummins VGT® Turbo and High Pressure Common Rail (HPCR) fuel system provide exceptional throttle response at every rpm, faster warmup and stronger engine braking.
  • Optimized Emissions Control – Cummins Single Module™ aftertreatment system has exceptional thermal efficiency, resulting in fewer regenerations, and meets OBD16 and GHG17 requirements.


  • Proven Track Record – Over 12 million B Series engines have been sold in the last 30-plus years. The most recent improvements include the turbo bearing and Exhaust Gas Recirculation (EGR) systems.
  • Better Filtration – New Cummins NanoNet® fuel filters provide 10 times better protection than conventional fuel filters.
  • Reliable Starting – A dependable air intake heater allows unaided cold starts, even at well below 10°F.
  • Full Vehicle Integration – Each OEM installation undergoes rigorous testing, to optimize dependability.


Configuration Inline 6
Displacement 408 CU IN 6.7 L
Lube Oil Capacity* 17.6-20.8 QT 16.7-19.7 L
Biodiesel compatibility Up to B20
Engine Braking Horsepower Up to 182 HP @ 3200 RPM
Idle Speed 700-900 RPM
No Load-Governed Speed 2800 RPM
Engine Weight (Dry) 1,150 lb 522 KG
Aftertreatment Weight* 125-167 LB 57-76 KG
Injection Pressure 26,000 PSI
*Depending on configuration

Product Finder Specifications

Certification Level EPA 2017
Power 300 - 360 hp / 224 - 268 kW
Torque 660 - 800 lb-ft / 895 - 1085 N•m


Engine Model Advertised HP (kW) @ RPM Peak Torque LB-FT (N•M) @ RPM
B6.7 360 360 (268) @ 2400 800 (1085) @ 1800
B6.7 340 340 (254) @ 2600 700 (949) @ 1600
B6.7 325 325 (242) @ 2400 750 (1017) @ 1800
B6.7 300 300 (224) @ 2600 660 (895) @ 1600



  • One Source for Service – Your local distributor supports both Cummins engines and Cummins Onan® generators.
  • Cummins on Every™ Corner – Over 3,500 authorized locations across North America, to support your parts and service needs.
  • RV Specialists – Over 40 Coach Care™ locations across the United States and Canada, to take care of more than just your engine and generator needs.
  • Connected Solutions™ – Combine with Cummins QuickServe® Online mobile, Cummins Fault Advisor and Connected Diagnostics,™ for even better support.
  • World-Class Support – Call 1-800-CUMMINS™ (1-800-286-6461) for answers to your questions and support for your service needs.
  • INSITE™ Mobile – Enables downloading of critical engine and operational data to mobile devices for fast, accurate diagnostics and reporting.
  • Get the Latest – For more information on the Cummins B6.7 engine, visit cumminsengines.com/rv.
    Visit power.cummins.com/rv to learn more about Cummins
    Onan generators. For maintenance and parts information,
    visit quickserve.cummins.com.


Maintenance Item Miles/Kilometers Hours Months
Oil & Filter

15,000 MI
24,000 KM

500 12
Fuel Filter

15,000 MI
24,000 KM

500 12
Crankcase Breather Filter

75,000 MI
120,000 KM

Overhead Adjustment

150,000 MI
240,000 KM

5,000 48
Consult your chassis and engine Owners Manuals for additional information

Brochures Available

Title Bulletin Number Request View  
2017 B6.7 For Recreational Vehicles Flyer 5410643 Request View  Download
2017 RV / EV Extended Coverage TriFold Brochure 5410639 Request View  Download