B6.7N
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% fewer NOx emissions than current EPA regulations.
| NOx emission | 0.1 g / bhp-hr. (50% below EPA) |
| Maximum Horsepower | 240 HP | 179 kW |
| Peak Torque | 560 LB-FT | 759 Nm |
| Governed Speed | 2,630 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 / RNG |
| Aftertreatment | Three-Way Catalyst |
| Base Warranty | 2 Years, Unlimited Miles |
| Engine Model | Advertised Horsepower (kW) @ rpm |
Peak Torque lb-ft (N•m) @ rpm |
Governed Speed |
| Truck | |||
| 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 |
| 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 |
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.
- New Natural Gas Engine Oil Specification (CES20092)
- List of Cummins approved CES oils
| Maintenance Item^ | Hours | Distance | Months |
| Oil And 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 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.
*Requires Natural Gas Engine Oil.
- 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.
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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.
