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The two things that matter most in a fire or emergency vehicle are response time and reliability. So we built the 2007 ISL with superior performance and exceptional dependability. And in the process, we also made it run cleaner.

How did we make these improvements and still meet stringent emissions controls? The ISL is designed as a totally integrated system that includes our proven cooled-EGR subsystem, a High Pressure Common Rail fuel injection system, patented VG Turbo, Cummins Particulate Filter and a crankcase ventilation system. Add the optional compression brake, and it even stops better with more than 330 braking hp.

And that's just the start of all the features the ISL has to help your fire and emergency vehicles get ready to roll on a moment's notice, every time.

The ISL is also designed to keep your budget from going up in smoke, with long maintenance intervals and excellent fuel economy. Ratings range from 345-425 hp.

 
Engine ModelAdvertised hpPeak TorqueGoverned Speed
ISL 4254251200 @ 13002200
ISL 4004001200 @ 13002200
ISL 3703701200 @ 13002200
ISL 3653651250 @ 14002100
ISL 3453451150 @ 13002100

The superior performance of the ISL comes from a constant flow of high-pressure fuel, injected with precise timing for optimum burn efficiency. An increased number of injection events per cycle results in an ISL that runs stronger and more efficiently than ever before.
Specifications.
Advertised Horsepower345-425 hp257-317 kW
Peak Torque1150-1250 lb-ft1559-1695 N•m
Governed Speed2100-2200 rpm
Clutch Engagement Torque575 lb-ft780 N•m
Number of Cylinders6
Oil System Capacity7.3 U.S. gallons27.6 liters
System Weight1,685 lb764 kg
Engine (Dry)1,635 lb742 kg
Aftertreatment*50 lb22 kg

*Increase over standard muffler

 
  • 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 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 for most vehicles before it needs cleaning.
  • Heavy-Duty Features - Replaceable wet liners, roller followers, two-piece steel articulated pistons, by-pass oil filtration, and targeted piston cooling.
Maintenance Intervals.
 MilesKilometersHours Months
Oil and Filter20,000 mi / 32,000 km5006
Primary Fuel Filter20,000 mi / 32,000 km5006
Secondary Fuel Filter40,000 mi /64,000 km1,00012
Coolant FilterNone*None*None*
Overhead Adjustment150,000 mi / 241,500 km5,00048
Standard Coolant Change240,000 mi / 385,000 kmN/A24
Coalescing FilterEvery 3rd to 4th Oil Change
Particulate Filter200,000-400,000 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.



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