B6.7N (2018)

Power 200 - 240 hp
149 - 179 kW
Torque 520 - 560 lb-ft
705 - 759 N•m
Certification EPA 2018


Medium-Duty Truck Natural Gas Engines School Bus Truck Equipment Manufacturers and Body Builders Vocational Refuse


Cummins introduces the new B6.7N natural gas engine for the school bus, shuttle, and medium-duty truck markets.  Rated up to 240 hp / 560 lb-ft torque, the B6.7N offers a reliable, low-emissions, and low cost option for your fleet.  The B6.7N is certified to California Air Resources Board Optional Low NOx standard of 0.02 g/bhp-hr – 90% lower
NOx emissions than current EPA regulations.

  • 100% natural gas engine, featuring spark-ignited stoichiometric combustion with cooled EGR and a maintenance-free Three-Way Catalyst
  • Closed Crankcase Ventilation (CCV) system and On-Board Diagnostics for optimal emissions performance
  • Certified to California Air Resources Board Optional Low NOx 0.02 g/bhp-hr – 90% lower
    current EPA standard); exceeds 2017 EPA GHG requirements
  • Cost-efficient and reliable performance
NOx emission 0.02 g/bhp-hr (90% below EPA) 
Maximum Horsepower 240 HP / 179kW
Peak Torque 560 lb-ft / 759 Nm
Governed Speed 2400 RPM
Type 4-cycle, spark-ignited, in-line
6 cylinder, turbocharged, CAC
Engine Displacement 409 CU IN / 6.7 Liters
Number of Cylinders 6
Operating Cycles 4
Net Weight (Dry) 1,150 lb / 522 KG
Fuel Type CNG / LNG / Biomethane
Aftertreatment Three-way Catalyst
Base Warranty 2 years, Unlimited Miles
  • Electronic Control Module: A new engine control module, CM2380, provides full monitoring and control of the engine sensors, and the fuel and ignition systems. It offers faster processing to support heavy duty On-Board Diagnostics requirements (500K baud rate). It is also telematics capable, and provides improved diagnostics and durability.
  • On-Board Diagnostics (OBD): The OBD system continuously monitors the engine and after-treatment system. It gives the vehicle owner or repair technician electronic access to the status of various vehicle subsystems for diagnostic purposes.
  • Closed Crankcase Ventilation (CCV) system: The CCV system reduces engine emissions by capturing crankcase emissions and rerouting these gases back to the engine. This results in more complete combustion and lower emissions.
  • Enhanced Three-Way Catalyst (TWC): TWCs are effective, simple, passive devices. They provide consistent emissions control performance, are maintenance-free and can be mounted vertically or horizontally on the vehicle. No active aftertreatment such as a diesel particulate filter or selective catalytic reduction is required.
  • High-Energy Ignition System: A new Ignition Control Module (ICM) provides better performance and improved spark plug and coil durability, plus self-diagnostics.

B6.7N < 33,000 lb (14,968 kg) GVW

Overall, maintenance for the B6.7N  is similar to that of diesel engines, but there are a few key differences:

  • Motor oil specifically formulated for natural gas engines is required. Do not use diesel engine oil in a natural gas engine. If diesel engine oil is used, valve torching, piston scuffing and reduction in spark-plug life will occur.  
  • For more information, visit Cummins QuickServe Online.
Maintenance Item^ Hours
Oil And Filter* 750
Spark Plugs 750
Spin-on Fuel Filter 1,000
Overhead Set Adjustment 1,500
Coolant System Drain 6,000
Closed Crankcase Ventilation Filter 2,000
Ignition Coil Extension 5,000
Air cleaner element Follow manufacturer's published recommendations

Consult your Owners or Operation and Maintenance manual for the complete daily and routine maintenance schedule
^Based on a duty cycle of 30 mph / 48 kph average speed. Distance intervals may decrease based on average speed.

*When using CES 20092 Natural Gas engine oil.

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