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.
| 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:
- 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)
- Extended Oil Drain Intervals with CES 20092 Natural Gas Engine Oils
- List of Cummins approved CES oils.
| 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.
