L9 for School Bus (2017)


L9 for School Bus (2017)

SmartEfficiency: High-Achieve and Cost-Lowering


The Cummins SmartEfficiency initiative is a focused approach that improves uptime and reliability while providing a broad spectrum of reliable engine choices to meet every need. The combination of a low cost of operation, high reliability, clean operation and long-term durability are unsurpassed in the industry. The fact that all Cummins engines use the same control system technology and can be serviced at any authorized Cummins location ensures serviceability anywhere, anytime


Even with a 27 year legacy of over 5 million engines sold, we continue to keep improving a time-tested and proven reliable product. The Cummins L9 diesel for 2017 delivers outstanding productivity and the best power-to-weight ratio in its class. Proven reliability keeps your trucks on the road longer. Faster, more accurate service provides even greater uptime, and customers can expect up to 15 percent better fuel economy over the engines of the last decade.


But the most important component we put in every L9 engine is the trust that comes from a legacy of over 27 years and 5 million engines. The L9 comes from a family of proven performers, with a heritage that gets stronger every year.


High-strength components, together with features such as replaceable cylinder liners for easier rebuilding, do more than add life to the engine; they also add to its residual value. The L9 is designed to excel in some of the toughest duty cycles. Cummins designs and manufactures our own engines and aftertreatment systems. In doing so, we’re providing customers greater performance, uptime, durability and efficiency.


Aftertreatment Technology: Simply Better


The Cummins L9 diesel engine features a new Single Module™ aftertreatment system that sets the new standard for efficiency. It combines Selective Catalytic Reduction (SCR) and a Diesel Particulate Filter (DPF) into a single flow-through design. It occupies up to 70 percent less space and weighs up to 30 percent less. The smaller size allows it to be installed closer to the engine, for better heat management. That, together with the reduced weight, contributes to improved fuel economy. The UL2 Urea Dosing System eliminates the need for engine coolant lines to the doser, provides more efficient atomization, to minimize the risk of urea dosing deposits and reduces regeneration events, while maintaining a 3 percent to 4 percent Diesel Exhaust Fluid (DEF) usage factor.


Connected Diagnostics: Smarter Route Management with Connected Diagnostics


School bus drivers have enough to pay attention to without being concerned about engine fault codes. In the rare event that one is triggered while the bus is in operation, it can be diagnosed immediately over the air, through the addition of Connected Diagnostics. Cummins Connected Diagnostics delivers real-time engine fault code analysis, with a probable diagnosis and a recommended action for school buses that are equipped with telematics.


L9 Specifications

Advertised Horsepower

260-350 HP

194-261 Kw

Peak Torque

720-1000 lb-ft

976-1356 N*m

Governed Speed

2200 rpm

Clutch Engagement Torque

500 lb-ft

678 N*m

Number of Cylinders


Engine Weight (Dry)

1,695 Lbs

769 Kg

Engine Finder Specifications

Power 260 - 350 hp / 194 - 261 kW
Torque 720 - 1000 lb-ft / 976 - 1356 N•m


L9 Ratings


Engine Model

HP (Kw)

Peak Torque
Lb-ft (N*m) @ RPM

Governed Speed

L9 350

350 (261)

1000 (1356) @ 1400


L9 330

330 (246)

1000 (1356) @ 1400


L9 300

300 (224)

860 (1166) @ 1300


L9 270

270 (201)

800 (1085) @ 1300


L9 260

260 (194)

720 (976) @ 1300



Cummins designs, develops and supports every component, from the air handling to the exhaust aftertreatment, to work as a totally integrated system – so we can optimize every function better than other engine manufacturers.

  • VGT® Turbocharger from Cummins Turbo Technologies - The patented design is widely recognized as an industry performance leader. Electronic actuation improves precision and responsiveness. The VGT Turbo is a key element in providing exceptional fuel economy and braking horsepower

  • Connected Diagnostics™ - Wirelessly connects your engine to Cummins through a telematics device for immediate diagnosis of a fault alert. Provides a clear recommendation for continued operation, or the need for service, within seconds.

  • XPI Fuel System from Cummins Fuel Systems - Delivers superior performance even in lower engine rpm ranges. Enables multiple injection events per cycle, for improved fuel efficiency with quieter, smoother operation.

  • Single Module Aftertreatment From Cummins Emission Solutions - 
    Combines high-efficiency SCR, a more reliable dosing unit and a DPF into a single flow-through unit. It is up to 70 percent smaller, so it’s easier to install, and as much as 30 percent lighter than the aftertreatment units it replaces. Better heat management improves fuel efficiency and minimizes periodic maintenance.

  • Fuel Filters And Lube Filters From Cummins Filtration - Fleetguard® filters protect against corrosion and contaminants with innovative technology, including NanoNet® media, which provides 10 times better protection than conventional fuel filters.

  • Single High-Capacity Electronic Control Module (ECM) - A higher capacity offers faster processing of more information, fully integrated control over the engine and aftertreatment system for optimized performance and improved engine lamp strategy.


Maintenance Item




Oil and Filter

15,000 mi

24,000 km



Fuel Filter

15,000 mi

24,000 km



Coolant Filter

15,000 mi

24,000 km



Overhead Adjustment

150,000 mi

240,000 km



Standard Coolant Change

60,000 mi

96,000 km



Coalescing Filter

Every 3rd to 4th Oil Change



DEF Filter

200,000 mi

320,000 km



Particulate Filter Cleaning

200,000 mi

320,000 km



Consult your Operation and Maintenance Manual for more information.