B6.7N (2018)

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

Applications

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

Overview:

Cummins Westport 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

For additional information visit cumminswestport.com and cwiplaybook.com.

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-ignigted, 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, see the links below or visit Cummins QuickServe Online.
Maintenance Item^ Hours Distance Months
Oil And Filter* 750 15,000 mi (24,000 km) 6
Spark Plugs 750 25,000 mi (40,000 km) 9
Spin-on Fuel Filter 1,000 30,000 mi (48,000 km) 12
Overhead Set Adjustment 1,500 45,000 mi (72,000 km) 18
Coolant System Drain 2,000 60,000 mi (96,000 km) 2 yrs
Closed Crankcase Ventilation Filter 2,000 60,000 mi (96,000 km) 2 yrs
Ignition Coil Extension 5,000 150,000 mi (240,000 km) 5 yrs
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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