ISC8.3 for School Bus (EPA 2010)


ISC8.3 for School Bus (EPA 2010)Expect the same high level of performance, reliability and fuel economy with the Cummins ISC8.3 EPA 2010 engine as you do with today’s ISC.  The ISC8.3 has one of the highest power-to-weight ratios in its class with heavy-duty features like replaceable wet liners.  It also features the XPI fuel system – the same technology that’s used in the ISX15.  These advances combined with an improved Electronic Control Module (ECM) and improved air flow, allow the ISC8.3 to run stronger and with greater responsiveness than ever before. Ratings range from 260-350hp with a maximum 1000 lb-ft of torque.

How did we make these improvements and still meet stringent 2010 emissions standards?  With a totally integrated system, that’s how.  Everything from the advanced fuel injection technology, improved cooled EGR subsystem and Cummins VGT™ Turbocharger to the proven Cummins Aftertreatment System that includes Selective Catalytic Reduction (SCR) technology has been engineered and manufactured in-house. The result is a totally integrated system delivering an engine that provides near-zero emissions without compromising performance.
And that’s just a few of all the features the ISC8.3 has to offer to help both your vehicles, and your business, run smoother.  These engines are designed to keep your maintenance to a minimum and your productivity in overdrive.

All backed by the best customer support in the business.

Considering a Cummins engine purchase? For more information including pricing and additional technical information, please contact your Cummins representative. If you need help finding a representative, the Cummins Sales and Service Locator tool can help.


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, School Bus

See ISC PowerSpec Engine Features


Advertised Horsepower  260-300 hp  194-224 kW 
Peak Torque  6680-860 lb-ft  895-1166 N•m 
Governed Speed  2200 RPM   
Clutch Engagement Torque  500 lb-ft  678 N•m
Number of Cylinders   
Oil System Capacity  6.3 U.S. Gallons  23.8 Liters 
System Weight  1,840 lb  834 kg 
  Engine (Dry)  1,640 lb  744 kg 
  Aftertreatment System* 200 lb  90 kg 

Engine Finder Specifications

Certification Level EPA 2010
Power 260 - 300 hp / 194 - 224 kW
Torque 660 - 860 lb-ft / 895 - 1166 N•m


Engine Model Advertised Horsepower (kW) Peak Torque lb-ft (N•m) @ rpm Governed Speed
ISC8.3 300  300 (224)  860 (1167) @ 1400  2200 RPM 
ISC8.3 270  270 (201)  800 (1086) @ 1300  2200 RPM 
ISC8.3 260  260 (194)  660 (896)  @ 1300   2200 RPM 


Maintenance Item  Miles/Kilometers  Hours  Months 
Oil and Filter*  15,000 mi
24,000 km 


Primary Fuel Filter**  15,000 mi
24,000 km  


Secondary Fuel Filter  30,000 mi
48,000 km 



Coolant Filter  None*** 



Overhead Adjustment 

150,000 mi
241,500 km 



Standard Coolant Change****  60,000 mi
96,000 km 



Coalescing Filter  Every 3rd t 4th Oil Change Interval 
DEF Filter  200,000 mi
320,000 km 
Particulate Filter Cleaning  200,000 mi
320,000 km 
*Assuming normal duty cycle
**OEM-supplied, intervals may vary
***If engine is equipped with an optional coolant filter, it will need to be replaced at the same intervals as the oil filter.
****Extended Coolant drian/flush/fill intervals may be followed when certain requirements are met.  For more information on these requirements, refer to the Cummins Coolant Requirements and Maintenance Service, Bulletin 3666132.

For complete maintenance information, please consult your Owner’s Manual or Operations and Maintenance Manual, available on QuickServe Online.

Brochures Available

Title Bulletin Number Request View  
School And Shuttle Bus Engines For EPA 2010 Spec Sheet 4971232 View  Download