Cummins L9N 280
Built: 2021-2026 · Series: L9N
More machines from model year 2021
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Cummins L9N — the 8.9-Litre Natural Gas Engine for Transit and Distribution – inline six-cylinder natural-gas engine of 8.9 litres, 280 to 320 hp, for transit and school buses and lighter trucks
The Cummins Westport L9N is an inline six-cylinder natural-gas engine of 8.9 litres, certified — like its larger sibling ISX12N — to the California "Optional Low NOx" standard of 0.02 g/bhp-hr, roughly 90 percent below the current North American limit. Combustion is stoichiometric with cooled exhaust-gas recirculation (SEGR); output ranges from about 280 to 320 hp with up to 1,000 lb-ft of torque depending on rating.
Read on 4 more paragraphs
Launched in 2018, the L9N is the natural-gas version of the L9 platform, which itself emerged in 2017 from the earlier ISL9 and traces back to the older C8.3 engine with its stroke lengthened to 144.5 mm. It runs on CNG, LNG or renewable natural gas (RNG).
Main applications are rigid and articulated transit buses, school buses, hybrid motorcoaches and lighter truck duty; ratings on record include L9N 320, 300, 280, 260 and 250.
As with other stoichiometric gas engines, the maintenance-free three-way catalyst replaces the diesel particulate filter and AdBlue-fed SCR system a diesel transit bus would need, noticeably cutting exhaust-system upkeep. The very low NOx levels matter particularly on dense downtown corridors, where transit buses stop frequently at stops with heavy pedestrian traffic.
As with the ISX12N, aftertreatment relies on a maintenance-free three-way catalyst. On used units, spark plugs and the gas metering system are worth checking alongside routine oil and filter service; no further type-specific weak points are documented in the sources reviewed.
Sources: SpecCodex register, model data: Cummins L9N, Cummins (manufacturer)
Technical data
Engine
| Engine code | LH3correct |
|---|---|
| Engine family | TCEXH0540LDCcorrect |
| Engine families | TCEXH0540LDC; SCEXH0540LDC; RCEXH0540LDC; RCEXH0540LDF; RCEXH0540LDG; PCEXH0540LDC; PCEXH0540LDG; NCEXH0540LDC; MCEXH0540LDCcorrect |
| Fuel | Compressed Natural Gas, Liquefied Natural Gascorrect |
| Rated output | 208.8 kW (= 280 hp)correct |
| Rated speed | 2,200 rpmcorrect |
| Maximum torque | 900 ft·lbfcorrect |
| Speed at max. torque | 1,300 rpmcorrect |
| Displacement | 8,900 cm³correct |
| Displacement | 8.9 lcorrect |
| Operating cycle | dieselcorrect |
| Injection | throttle-body injectioncorrect |
| Aspiration | turbochargedcorrect |
Origin and approval
| Version | LH3correct |
|---|---|
| Built from | 2021correct |
| Built to | 2026correct |
| Model year from | 2021correct |
| Model year to | 2026correct |
| Sales region | USA certificationcorrect |
Other data
| Application | Both Tractor and Vocationalcorrect |
|---|
Frequently asked questions
How much power does the Cummins L9N 280 have?
The Cummins L9N 280 delivers 209 kW.
What engine does the Cummins L9N 280 have?
8,900 cm³ displacement, Compressed Natural Gas, Liquefied Natural Gas.
When was the Cummins L9N 280 built?
Production years: 2021-2026.
What to check before buying
- Match the data plate against the order: frame size, mounting and rating have to agree.
- For used units, ask about winding condition and bearing play.
- Ask about parts availability for this series — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 23 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
Sources: [1]
Diesel engine in 3D section
Turn the model, look inside and click an assembly — each one is explained.
Parts for this engine (25)
Manufacturer part numbers from the official EPA documentation. No prices or availability — those come from the supplier.
| Teilenummer | Bezeichnung | Hersteller |
|---|---|---|
| 2897334 | Compressor Outlet Pressure Sensor;Comp out pressure sensor | Cummins |
| 5698456 | Compressor Outlet Pressure Sensor;BarometricPressureSensor;Comp out pressure sensor | Cummins |
| 4954905 | Coolant Temperature Sensor;Coolant Temp Sensor;Coolant Temperature Sensor;Engine Out NOx Sensor 2;Coolant Temperature Sensor;Oil Temperature Sensor;Oil Temperature Sensor;Coolant Temperature Sensor;Coolant temp sensor | Cummins |
| 5347234 | EGR Cooler | Cummins |
| 5483009 | EGR Valve | Cummins |
| 5594276 | Engine Crankshaft;Crankshaft Position Sensor;Crankshaft Position Sensor;Camshaft Position Sensor;Camshaft Position Sensor;Crankshaft Position Sensor;Engine Crankshaft;Engine Camshaft;Engine Camshaft Position Sensor;Engine Camshaft;Engine Camshaft;Engine Crankshaft;Engine Camshaft;Engine Crankshaft;Engine Camshaft Position Sensor;Engine Camshaft | Cummins |
| 5491911 | Engine Control Module | Cummins |
| 5594275 | Engine Crankshaft;Camshaft Position Sensor;Engine Camshaft;Engine Crankshaft;Engine Crankshaft Position Sensor;Engine Crankshaft;Engine Camshaft;Engine Crankshaft Position Sensor;Engine Crankshaft;Engine Camshaft | Cummins |
| 2872858 | EGR Out Temperature Sensor;Intake Manifold Temp Sensor;EGR Out Temperature Sensor;EGR Out Temperature Sensor;Intake Manifold Temp Sensor;EGR temp sensor | Cummins |
| 4384687 | EGR delta pressure sensor | Cummins |
| 6419884 | EGR delta pressure sensor | Cummins |
| 9999999 | Fuel Injector Pump;Fuel Injection Pump | Cummins |
| 1234567 | Fuel Injector | Cummins |
| 5482154 | Gas Mass Flow Sensor | Cummins |
| 4384340 | Humidity Sensor;Humidity sensor | Cummins |
| 4384346 | Intake Manifold Temperature | Cummins |
| 4384382 | Oxygen Sensor;Sec. oxygen sensor | Cummins |
| 4394751 | Catalyst Element | Cummins |
| 4384259 | Turbine Inlet Temperature Sensor | Cummins |
| 5357726 | Turbocharger | Cummins |
| 5357732 | Turbocharger | Cummins |
| 5645385 | Turbocharger | Cummins |
| 6414331 | Turbocharger | Cummins |
| 6428087 | Turbocharger | Cummins |
| 6438087 | Turbocharger | Cummins |
Quelle: 2014 Model Year On-Highway Heavy-Duty Engine Certification Data
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