ISB for Fire & Emergency (EPA 07)


ISB for Fire & Emergency (EPA 07)Whether you're rushing paramedics to an accident scene or responding to a brush fire, you can count on Cummins ISB. Every call. Every time. The 2007 ISB combines increased displacement (5.9 liters to 6.7 liters) and High Pressure Common Rail fuel injection with our patented Variable Geometry Turbo to deliver stronger performance at every rpm. Multiple injection events per cycle also make the ISB run extremely quiet.

Of course, the ISB also meets 2007 emissions requirements. The fact that it runs both stronger and cleaner is the result of our totally integrated design. Features include a proven cooled-EGR subsystem, High Pressure Common Rail fuel injection, the VG Turbo, Cummins Particulate Filter and a crankcase ventilation system, all developed to work together under the control of a single, more powerful ECM. The VG Turbo also doubles as an exhaust brake to increase stopping power. The result is an engine that delivers optimum performance, reliability, durability and fuel efficiency with increased safety.

The ISB is also designed to keep operating costs in check, with long maintenance intervals and excellent fuel economy. Ratings range from 260-350 hp.


Cummins PowerSpec is an electronic tool that makes it possible to tailor the operation of Cummins engines in every on-highway application.

Available for: On-Highway, Fire & Emergency

See ISB PowerSpec Engine Features


Cummins ISB is designed for years of reliable service. Put all that together with Six Sigma design practices, and you've got an engine that is built to last, and deliver the lowest total cost of ownership of any engine in its class.

Advertised Horsepower 260-350 hp 194-261 kW
Peak Torque 620-750 lb-ft 841 - 1017 N•m
Governed Speed 2600-2800 rpm
Clutch Engagement Torque 400 lb-ft 543 N•m
Number of Cylinders 6
Oil System Capacity 4 U.S. gallons 15.14 liters
System Weight 1,180 lb 535 kg
Engine (Dry) 1,150 lb 522 kg
Aftertreatment* 40 lb 18 kg

*Increase over standard muffler

Product Finder Specifications

Certification Level EPA 2007
Power 260 - 350 hp / 194 - 261 kW
Torque 620 - 750 lb-ft / 841 - 1017 N•m


Engine Model Advertised hp Peak Torque Governed Speed
ISB 350 350 750 @ 1800 2600
ISB 340 340 660 @ 1600 2900
ISB 325 325 750 @ 1800 2600
ISB 300 300 620 @ 1600 2600
ISB 280 280 660 @ 1600 2600
ISB 260 260 620 @ 1600 2600


  • Displacement Increased to 6.7 Liters - 13% increase in displacement (from 5.9 to 6.7 liters) for increased power and performance.
  • Enhanced High Pressure Common Rail Fuel System - Delivers optimum balance of performance, emissions control and fuel economy across the entire operating range.
  • Full-Authority Electronic Controls - Higher microprocessor capacity and speed for optimum control of the engine and aftertreatment.
  • Cooled Exhaust Gas Recirculation - Lowers combustion temperatures for reduced emissions and optimized mpg.
  • Variable Geometry Turbocharger - Enhanced response and control with electric actuation for an infinite adjustment, providing exact boost across the operating range. Sliding-nozzle design increases reliability, durability.
  • Cummins Particulate Filter - Fully integrated for uncompromising performance, reliability. Reduces particulate matter 90%.
  • Crankcase Ventilation System - coalescing filter only needs replacement every 3rd to 4th oil change.
  • Low Maintenance - Long oil change intervals maintained. Cummins Particulate Filter will go 200,000-400,000 miles (320,000-640,000 km) in a typical duty cycle in most vehicles before it needs cleaning.


Maintenance Intervals
  Miles / Kilometers Hours Months
Oil and Filter 15,000 mi / 24,000 km 500 6
Primary Fuel Filter 15,000 mi / 24,000 km 500 6
Coolant Filter None* None* None*
Overhead Adjustment 150,000 mi / 241,500 km 5,000 48
Standard Coolant Change 60,000 mi / 96,000 km N/A 24
Coalescing Filter Every 3rd to 4th Oil Change
Particulate Filter 200,000-400,000 mi (320,000-640,000 km)

*If engine is equipped with an optional coolant filter, it will need to be replaced on the same intervals as the oil filter.

For complete maintenance information, please consult your Owner's Manual or Operations and Maintenance Manual.

Brochures Available

Title Bulletin Number Request View  
Cummins Particulate Filter For Fire And Emergency Vehicles Flyer (EPA 2007 and EPA 2010) 4971356 Request View  Download
National Overhaul Warranty For MidRange Engines Flyer 4021552 Request View  Download
SmartSaver6 Injector Kit For ISB5.9 And ISB6.7 Engines Flyer 2878929 Request View  Download
SmartSaver6 Injector Kit For ISB5.9 And ISB6.7 Engines Flyer - French 2878936 Request View  Download