B6.7N (2018)

Overview

B6.7N (2018)

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 0.1 g/bhp-hr - 50% 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 0.1 g Standard - 50% below current EPA standard); exceeds 2017 EPA GHG requirements
  • Cost-efficient and reliable performance

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

Specifications

NOx emission 0.1g / bhp-hr (50% 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

Product Finder Specifications

Markets
Natural Gas
Certification Level EPA 2017
Power 240 hp / 179 kW
Torque 560 lb-ft / 759 N•m

Ratings

Engine Model Advertised Horsepower (kW) @ rpm Peak Torque lb-ft (Nm) @ rpm Governed Speed
Truck
B6.7 N 200 200 (149) @ 2400 520 (705) @ 1600 2630 rpm
B6.7N 220 220 (164) @ 2400 520 (705) @ 1600 2630 rpm
B6.7N 240 240 (179) @ 2400 560 (759) @ 1600 2600 rpm
School Bus
B6.7N 200 200 (149) @ 2400 520 (705) @ 1600 2630 rpm
B6.7N 220 220 (164) @ 2400 520 (705) @ 1600 2630 rpm
B6.7N 240 240 (179) @ 2400 560 (759) @ 1600 2600 rpm
Shuttle Bus
B6.7N 200 200 (149) @ 2400 520 (705) @ 1600 2630 rpm
B6.7N 220 220 (164) @ 2400 520 (705) @ 1600 2630 rpm
B6.7N 240 240 (179) @2400 560 (759) @ 1600 2600 rpm

Features

  • 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.

Maintenance

B6.7N < 33,000 lb (14,968 kg) GVW

Overall, maintenance for the B6.7Nis 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.
New Natural Gas Engine Oil Specification (CES 20092)

Maintenance Item^ Hours Distance Months
Oil & Filter* 500 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 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 duty cycle of 30 mph / 48 kph average speed.  Distance intervals may decrease based on average speed.
*Requires Natural Gas Engine Oil

Brochures Available

Title Bulletin Number Request View  
CWI 2018 All Products Brochure View  Download
CWI B6.7N Brochure 5544077 Request View  Download
Integrated Power Flyer 5411035 Request View  Download
Natural Gas Engine Oils Request View  Download
School Bus Product Portfolio Brochure 5544100 Request View  Download