L9N

The 2018 L9N continues the evolution of emissions-leading natural gas engines from Cummins Westport. Certified to the California Air Resources Board and Environmental Protection Agency's (EPA) Optional Low NOx emissions standard of 0.02 g/bhp-hr, it has 90% fewer NOx emissions than the current North American EPA standard. Offering 320 hp / 1,000 lb-ft torque, with improved performance and reliability, the near-zero emissions L9N is a great fit for transit, refuse, and truck applications.

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NOx emission 0.02 g / bhp-hr. (90% below EPA)
Maximum Horsepower 320 HP | 239 kW
Peak Torque 1,000 LB-FT | 1,356 Nm
Governed Speed 2200 RPM
Type 4-cycle, spark-ignited, in-line
6 cylinder, turbocharged, CAC
Engine Displacement 540 CU IN | 8.9 LITERS
Number of Cylinders 6
Operating Cycles 4
Net Weight (dry) 1,625 lb | 737 KG
Fuel Type CNG / LNG / RNG
Aftertreatment Three-Way Catalyst
Base Warranty 2 Years, 250,000 Miles
(402,336 KM) Truck
2 Years, Unlimited Miles
Transit/Shuttle
Engine Model Advertised Horsepower
(kW) @ rpm
Peak Torque 
lb-ft (N•m) @ rpm
Governed
Speed
Truck & Refuse    
L9N 250 250 (186) @ 2200 730 (990) @ 1300 2200 rpm
L9N 260 260 (194) @ 2200 660 (895) @ 1300 2200 rpm
L9N 280 280 (209) @ 2000 900 (1220) @ 1300 2200 rpm
L9N 300 300 (224) @ 2100 860 (1166) @ 1300 2200 rpm
L9N 320 320 (239) @ 2000 1000 (1356) @ 1300 2200 rpm
School & Shuttle Bus    
L9N 250
250 (186) @ 2200 730 (990) @ 1300 2200 rpm
L9N 260 260 (194) @ 2200 660 (895) @ 1300 2200 rpm
L9N 280 280 (209) @ 2000 900 (1220) @ 1300 2200 rpm
L9N 300 300 (224) @ 2100 860 (1166) @ 1300 2200 rpm
Transit Bus    
L9N 280 280 (209) @ 2000 900 (1220) @ 1300 2200 rpm
L9N 320 320 (239) @ 2000 1000 (1356) @ 1300 2200 rpm

L9N Truck < 66,000 lbs (29,937 kg) GCVW

Overall, maintenance for the L9N is similar to that of diesel engines, but there are a few key differences:

Maintenance Item^ Hours Distance Months
Oil And Filter* 500 15,000 mi (24,000 km) 6
Coolant Filter 500 15,000 mi (24,000 km) 6
Fuel Filter 1,000 30,000 mi (48,000 km) 9
Spark Plugs 1,500 45,000 mi (72,000 km) 12
Closed Crankcase Ventilation Filter 2,000 60,000 mi (96,000 km) 18
Cooling System Flush 2,000 60,000 mi (96,000 km) 18
Overhead Set Adjustment** 2,000 60,000 mi (96,000 km) 18
Ignition Coil Extension 10,000 300,000 mi (480,000 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. 
For customers using CES 20092 natural gas engine oils only, the recommended interval is 1,000 hrs
**Initial overhead set adjustment at 1,000 hours.

 L9N Urban Transit and Refuse Truck  

Maintenance Item^ Hours Distance Months
Oil And Filter* 500 7,500 mi (12,000 km) 6
Coolant Filter 500 7,500 mi (12,000 km 6
Fuel Filter 1,000 15,000 mi (24,000 km) 9
Spark Plugs 1,500 22,500 mi (36,000 km) 12
Closed Crankcase Ventilation Filter 2,000 30,000 mi (48,000 km) 18
Cooling System Flush 2,000 30,000 mi (48,000 km) 18
Overhead Set Adjustment** 2,000 30,000 mi (48,000 km) 18
Ignition Coil Extension 10,000 150,000 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 15 mph / 24 kph average speed. Distance intervals may decrease based on average speed.
*Requires Natural Gas Engine Oil. For customers using CES 20092 natural gas engine oils only, the recommended interval is 1,000 hrs
**Initial overhead set adjustment at 1,000 hours.

  • 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.