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Better. Every Route.
Engines For Urban Transit
Applications.

We’ve utilized our fully integrated technology
to simultaneously improve fuel economy and
performance, lowering operating costs as we reduce
emissions to near-zero levels.
Better. Where It Counts. Every Minute.
What counts is cleaner, more fuel efficient and more
reliable engines to keep your buses on schedule.
That’s what Cummins 2013 engines deliver, whether
you are looking for diesel, natural gas or dieselelectric
hybrid engines to power your urban bus
fleet.
Cummins is a leader in hybrid diesel engines. Dieselelectric
buses powered by Cummins ISB6.7 and ISL9
engines have completed millions of miles of reliable
service throughout the world.
Our total commitment to delivering reliable power you
can count on every minute, backed by the largest
and most capable service and support network in
North America, is the reason Cummins has been the
#1 choice in U.S. urban transit fleets since 1998.
Not only do all of our Cummins transit bus engines
meet U.S. Environmental Protection Agency (EPA)
2013 emissions standards, but they also meet 2014
greenhouse gas (GHG) and fuel efficiency standards
a full year ahead of schedule. Our ISL9 and ISB6.7
clean diesel engines get up to 2 percent better fuel
economy versus 2010 engines, while the Cummins
Westport ISL G takes advantage of an abundance
of domestically produced natural gas to provide
lower total cost of ownership. These engines
share common base engine components, for
exceptional reliability and durability.
Cummins is the only engine manufacturer to design,
develop and support a totally integrated system from
the air handling to the exhaust aftertreatment. This
allows us to optimize performance to a degree that
no other manufacturer can match.

Leadership In Clean Diesel Technology.
Cummins is a leader in the development of diesel
engines with near-zero emissions. Our fully integrated
approach includes the Cummins Aftertreatment
System with a Diesel Particulate Filter (DPF) that
works in combination with our Selective Catalytic
Reduction (SCR) system. The entire system is
controlled by a single, robust Electronic Control
Module (ECM), for optimized combustion, better
performance and enhanced reliability.
Cummins 2013 ISL9 diesel is
equipped with a proven On-Board
Diagnostics system used in
thousands of on-road vehicles
since 2007. This system continuously monitors
performance of the emissions system, providing alerts
through a Malfunction Indicator Lamp (MIL) on the
instrument panel. The MIL illuminates when it detects
a malfunction related to the emissions control system,
altering the operator that the engine needs proper
troubleshooting and possible repair.
Alternative Technologies –
Natural Gas And Hybrid Engines.
At Cummins, we recognize that just talking about
climate change and environmental impact aren’t
enough. So, in addition to offering clean-diesel
engines, we're at the forefront of alternative
technologies that can help reduce our dependence
on fossil fuels, and lower GHG emissions.
These include the ISL G natural gas engine from
Cummins Westport and our ISL9 and ISB6.7
diesel-electric hybrid engines.
The Cummins Westport ISL G is the most popular
natural gas engine in North America today,
delivering all the advantages of clean-burning
natural gas with no compromise in power or
torque.
Cummins ISL9 and ISB6.7 engines are used in a
wide range of hybrid diesel-electric systems found
in 30- to 60-foot standard and articulated buses all
across North America.

Cummins ISB6.7. Better Adds Up.
Reduced operating costs. Lower greenhouse gas
emissions. The fact that you get both in an engine
that meets 2014 GHG and fuel efficiency standards
a year ahead of schedule with near-zero emissions
is a bonus. The ISB6.7 is available exclusively
for transit bus hybrid diesel-electric propulsion
systems.
Cummins ISB6.7 already provides best-in-class
fuel economy, and it gets up to 2 percent better
fuel economy versus the 2010 model, so you get
lower operating costs. There is no compromise in
performance, either. The ISB6.7 used in hybrid dieselelectric
power plants is rated at 280 hp (209 kW) with
660 lb-ft (896 N•m) of torque.
ISB6.7 Maintenance Intervals
Maintenance Item Miles/Kilometers Hours Months
Oil and Filter 15,000 mi 500 6
24,000 km
Fuel Filter 15,000 mi 500 6
24,000 km
Coolant Filter 15,000 mi 500 6
24,000 km
Overhead Adjustment 150,000 mi 5,000 48
241,500 km
Standard Coolant Change 60,000 mi 2,000 24
96,000 km
Coalescing Filter Every 3rd to 4th Oil Change Interval
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.
ISB6.7 Specifications
Advertised Horsepower 280 hp 209 kW
Peak Torque 660 lb-ft 896 N•m
Governed Speed
2600 rpm
Clutch Engagement Torque 400 lb-ft 542 N•m
Number of Cylinders 6
System Weight 1,357 lb 616 kg
Engine (Dry) 1,150 lb 522 kg
Aftertreatment System* 207 lb 94 kg
*Increase over standard muffler; does not include chassis OEM-supplied
components.

A Better Route To Better Performance.
Cummins ISL9 clean diesel engine combines proven
reliability with exceptional durability. Years of bus duty
in tough urban routes provide ample evidence that its
high power-to-weight ratio, replaceable wet liner design,
roller followers, bypass oil filtration, targeted piston
cooling and other heavy duty engine features set the
standard for others to follow. It uses the XPI fuel system,
and shares the same high capacity Electronic Control
Module (ECM) with all other Cummins on-highway
diesel engines, for powerful, smooth, quiet performance.
ISL9 Maintenance Intervals
Maintenance Item Miles/Kilometers Hours Months
Oil and Filter 15,000 mi 500 6
24,000 km
Fuel Filter 15,000 mi 500 6
24,000 km
Coolant Filter 15,000 mi 500 6
24,000 km
Overhead Adjustment 150,000 mi 5,000 48
241,500 km
Standard Coolant Change 60,000 mi 2,000 24
96,000 km
Coalescing Filter Every 3rd to 4th Oil Change Interval
DEF Filter 200,000 mi 6,500
320,000 km
Particulate Filter Cleaning 200,000 mi 6,500
320,000 km
Consult your Operation and Maintenance Manual for more information.
Plus, because cleaner is better, the ISL9 already meets
2014 GHG and fuel economy standards, getting 2 percent
better fuel economy versus the previous model. Clean
diesel ratings are available at 280 hp (209 kW) and 330 hp
(246 kW) with up to 1100 lb-ft (1493 N•m) of peak torque.
A diesel-electric hybrid rating is available at 330 hp (246 kW)
with a peak torque of 1100 lb-ft (1493 N•m). The ISL9 has
the street smarts to make every urban transit operation run
better. Every bus. And every route.
ISL9 Specifications
Advertised Horsepower 280-330 hp 209-246 kW
Peak Torque 900-1100 lb-ft 1221-1493 N•m
Governed Speed
2200 rpm
Clutch Engagement Torque 550 lb-ft 746 N•m
Number of Cylinders 6
System Weight 1,914 lb 868 kg
Engine (Dry) 1,697 lb 770 kg
Aftertreatment System* 217 lb 98 kg
*Increase over standard muffler; does not include chassis OEM-supplied
components.

Designed To Work Better – Where It Counts.
Cummins designs every component from air handling to the exhaust aftertreatment to work as a totally integrated system,
so we can optimize performance better than other engine manufacturers.
High-Capacity Electronic
Control Module (ECM)
A single ECM manages the entire
engine and aftertreatment system,
for optimum performance. This ECM
is used across the board for 2013
on-highway engines.
VGT Turbocharger From Cummins
Turbo Technologies
This patented design is widely recognized
as the industry leader for performance.
Electric actuation improves precision
and responsiveness.
Cummins Aftertreatment System
From Cummins Emission Solutions
The proprietary system consists of a Diesel Particulate
Filter (DPF) and Selective Catalytic Reduction (SCR)
technology for near-zero emissions.
Fleetguard ® Fuel Filters, Lube Filters
And DEF From Cummins Filtration
Fleetguard filters protect against corrosion and
contaminants with innovative technology such
as NanaoNet media, which provides 10 times
better protection than conventional fuel filters.
High quality DEF is widely available at authorized
Cummins and Fleetguard locations, as well as in
bulk delivery.
High Pressure Common Rail (HPCR)
Fuel System From Cummins Fuel
Systems
High injection pressures produce quick throttle
response at every rpm. Optimized timing
increases fuel efficiency and lowers emissions.
(ISB6.7)
XPI Fuel System From
Cummins Fuel Systems
Delivers superior performance at
every speed. Multiple injection
events per cycle improve fuel
efficiency and enable smoother,
quieter operation. (ISL9)

Naturally Better. Cummins Westport ISL G
Natural Gas Engine.
There are over 40,000 Cummins Westport natural
gas engine-equipped vehicles performing cleanly and
reliably today. Interest in natural gas engines is steadily
growing throughout North America, with Cummins
Westport natural gas engines widely recognized for their
technological leadership in urban transit fleets. The ISL G
combines all the advantages of clean burning natural gas
with no compromise in power or torque.
The ISL G uses Stoichiometric cooled Exhaust Gas
Recirculation (SEGR) combustion to create the optimal
combination of power, torque and low emissions levels.
Stoichiometric combustion is the ideal ratio at which fuel
and oxygen are both completely consumed.
ISL G Maintenance Intervals
Maintenance Item Miles/Kilometers Hours Months
Oil and Filter* 7,500 mi 500 6
12,000 km
Fuel Filter 15,000 mi 1,000 12
24,000 km
Coolant Filter 7,500 mi 500 6
12,000 km
Spark Plugs 22,500 mi 1,500 18
36,000 km
Coolant Change 30,000 mi 2,000 24
48,000 km
Valve Adjustment** 30,000 mi 2,000 24
48,000 km
Air Cleaner/Element
Follow vehicle manufacturer’s
published recommendations
*Requires natural gas engine oil (CES 20074).
**Initial valve adjustment at 1,000 hours.
The oxygen free exhaust stream enables the use of our
proprietary Three-Way Catalyst (TWC). This completely
passive device never needs additional fluids, regeneration
or cleaning, and takes the place of a conventional muffler.
Fuel for the Cummins Westport ISL G can be stored on the
vehicle as compressed natural gas (CNG) or liquefied natural
gas (LNG). The ISL G can also run on renewable natural
gas (RNG) made from biogas or landfill gas that has been
upgraded for vehicle fuel quality.
The ISL G shares 80 percent of its heavy duty components
with its diesel counterpart, the Cummins ISL9. This
increases durability and reliability while reducing the overall
ownership cost. The troubleshooting capabilities (using
Cummins standard software and diagnostic tools) are
also shared.
ISL G Specifications
Advertised Horsepower 280-320 hp 209-239 kW
Peak Torque 900-1000 lb-ft 1221-1356 N•m
Governed Speed
2200 rpm
Clutch Engagement Torque 550 lb-ft 746 N•m
Number of Cylinders 6
Net Weight (Dry) 1,625 lb 737 kg
Aftertreatment System Three-Way Catalyst (TWC)

Better Comes Naturally.
Proven Wastegate Turbo From
Cummins Turbo Technologies
A simple, reliable design from the world
leader in turbocharging technology.
Three-Way Catalyst (TWC) From
Cummins Emission Solutions
TWCs are passive devices packaged as part
of the muffler, and are maintenance-free. The
ISL G des not require active aftertreatment
such as a particulate filter or Selective
Catalytic Reduction (SCR).
Stochiometric Cooled EGR
The ideal air/fuel ratio for complete
combustion means zero oxygen in
the exhaust, which allows use of
the passive Three-Way Catalyst.
High Energy Ignition System
Provides better performance, longer
service intervals and improved spark
plug and coil durability, plus selfdiagnostics.
A coil-on-plug ignition
system eliminates the need for spark
plug wires.
Fully Skirted ISL Diesel
Engine Block
The high-strength, rebuildable
design adds durability. Shares
80 percent of major engine
components with the ISL9 diesel.
High-Capacity Electronic
Control Module (ECM)
Provides full monitoring and control
of engine sensors, the fuel system
and the ignition system. Compatible
with Cummins software and other
diagnostic service tools.

QuickServe ® Online.
QuickServe Online sorts through 11 million Cummins
engines and a million documents in seconds to
find accurate, up-to-the-minute parts and service
information about a customer’s engine. Every fact is
instantly available, from part numbers, diagrams and
supercessions to service bulletins and troubleshooting
manuals, operation and maintenance manuals, literature,
tools, catalogs and more. See quickserve.cummins.com
for access information.
Genuine Cummins New And ReCon ® Parts.
We stock parts for 100,000 individual
part numbers at our Memphis
Distribution Center, including
both new (Genuine Cummins)
and remanufactured (ReCon)
parts. Our centralized distribution
network assures next-day delivery
almost everywhere in North America
on parts orders received by midnight EST. Genuine
Cummins Parts are of the highest quality and backed by
the best parts warranty in the industry. And we are so
confident in the reliability of Genuine Cummins ReCon
parts that every one comes with a full Cummins warranty.
Training Every Technician.
Make sure your technicians have the training on all
the latest technology. Cummins distributors offer local
training using the same diagnostic procedures and repair
techniques that are taught by our factory personnel.
Every Confidence.
All Cummins and Cummins Westport transit engines
come with a standard 2-year/unlimited-mileage warranty
with full parts and labor on warrantable failures.* This
includes travel or towing when a bus is disabled or when
further operation would cause additional damage. Major
components are covered up to 3 years or 300,000 miles
(482,804 km), whichever occurs first, on Cummins ISL9
and ISL G urban transit bus engines.
*Warrantable failures are those due to defects in materials or Cummins
workmanship.
ISB6.7 Ratings
Engine Advertised HP (kW) Peak Torque Governed
Model LB-FT (N•m) @ RPM Speed
ISB6.7 Hybrid 280 (209) 660 (896) @ 1600 2600 rpm
ISL9 Ratings
ISL9 330 330 (246) 1100 (1493) @ 1400 2200 rpm
ISL9 280 280 (209) 900 (1221) @ 1300 2200 rpm
ISL9 Hybrid 330 (246) 1100 (1493) @ 1400 2200 rpm
ISL G Ratings
ISL G 320 320 (239) 1000 (1356) @ 1300 2200 rpm
ISL G 280 280 (209) 900 (1220) @ 1300 2200 rpm
Better Extended Coverage.
For additional peace of mind, Cummins and Cummins
Westport offer a variety of extended coverage plans to
meet every transit operation’s needs. Check with your
local Cummins distributor for details.
Better Service. Everywhere.
Cummins-powered urban
transit buses are backed by the
largest and most capable parts,
service and support network
in North America, with nearly
3,500 locations. Our authorized
technicians are fully trained on all our engines, and have
the necessary equipment and Genuine Cummins Parts to
handle any type of service issue. Call 1-800-DIESELS
(1-800-343-7357) for information and service locations.
Better Answers.
To learn more, visit cumminsengines.com or
cumminswestport.com. Assistance is also available
by phone at 1-800-DIESELS (1-800-343-7357), or
contact your local Cummins distributor or dealer. Product
literature and additional information are always accessible
online at cumminsengines.com. You can also register all
of your Cummins engines quickly and easily, and sign
up for our Bus News electronic newsletter for important
updates.

Cummins Inc.
Box 3005
Columbus, IN 47202-3005
U.S.A.
Phone: 1-800-DIESELS (1-800-343-7357)
Fax: 1-800-232-6393
Internet: cumminsengines.com
Twitter.com/CumminsEngines
YouTube.com/CumminsEngines
Bulletin 4971427 Printed in U.S.A. 5/13
©2013 Cummins Inc.