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September 03, 2013  |   Comments (4)   |   Post a comment

Navistar adds Cummins ISB engine for school buses, trucks

By Thomas McMahon


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IC Bus CE Series school buses (pictured) and International DuraStar trucks with the Cummins ISB engine will be Navistar's first medium-duty vehicles with SCR emissions aftertreatment.

IC Bus CE Series school buses (pictured) and International DuraStar trucks with the Cummins ISB engine will be Navistar's first medium-duty vehicles with SCR emissions aftertreatment.

LISLE, Ill. — Navistar International Corp. will offer the Cummins ISB 6.7-liter engine for IC Bus CE Series school buses, company officials announced on Tuesday.

The Cummins ISB will also be offered for International DuraStar medium-duty trucks. Those trucks and the CE Series school buses with the ISB engine will be Navistar's first medium-duty vehicles with selective catalytic reduction (SCR) emissions aftertreatment.

The Cummins ISB is also among the engine options for school buses from Thomas Built Buses, Blue Bird and Lion Bus. One pupil transportation veteran told SBF that this may be the first time in the industry’s history that one engine will be available for large school buses from each manufacturer.

Navistar will begin taking orders immediately for buses and trucks with the Cummins ISB. Regular production for CE Series school buses with the ISB is scheduled for late January 2014.

"Adding the proven, market-accepted Cummins ISB to our lineup is a key part of our strategy to offer our customers the most comprehensive medium-duty truck and bus offerings," said Jack Allen, Navistar executive vice president and chief operating officer. "The ISB will complement our existing engine offerings and will be a catalyst as we look to improve our medium-duty truck and bus business in 2014 and beyond."

Bill Kozek, Navistar’s president of North America truck and parts, added that customers from across the industry have “extensive familiarity and confidence in the Cummins ISB. … Customers seeking commonality in their engine lineup have expressed significant interest in combining the Cummins ISB engine with our chassis, and we anticipate strong demand and orders as a result.”

While the Cummins ISB is a new offering for Navistar's medium-duty trucks and buses, Navistar has gained experience packaging and manufacturing medium-duty trucks with the Cummins ISB since 2010 through its Ford Blue Diamond joint venture.

Navistar and Cummins have worked together over the past year to launch the Cummins ISX 15-liter engine in Navistar’s Class 8 trucks. The two companies also collaborated to add the Cummins SCR aftertreatment system to Navistar’s proprietary MaxxForce 13-liter engine.


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It is great that IC is going with ISB, but what about the service. We are a owner operator with 300 IC schoolbuses. We have a great working relationship with Navistar. Are the dealers/service centers going to be able to work on cummins engines?

frederick cabegin    |    Sep 19, 2013 01:50 PM

I own 21 2006-07 IC buses with the V365 engine and hydraulic brakes. The buses range in miles from 65,000 to 85,000. Each has had repetitive issues with the turbocharger, the EGR cooler leaking, the internal high pressure oil line leaking, the brake control module and the hydraulic brake control unit. Most if not all of these required a $300 tow to the dealer and a repair of $2500 to $4500 plus my buses being out of service sometimes for several weeks as we waited in line behind others for the repairs to be made or the parts to be obtained. Often I questioned if IC/Navistar would be willing to at least cover parts despite being out of warrantee because these were ongoing issues not only with my buses but throughout all IC/Navistar buses and trucks. They offered not one cent. I own a fleet of 120 buses and will never purchase another IC bus nor will I recommend anyone to purchase one. I've been purchasing the Cummins ISB in my BlueBird buses since 2008 so I don't need IC to sell them to me now.

Steve Worhunsky    |    Sep 04, 2013 05:32 AM

Is the SCR another name for DEF? I think part of the problem stems from issues that Navistar is having with their engines and the 2 turbo chargers. Having owned 3 IC buses and having issues from brake module fire and sars cannister to replacement of turbo charges, school District can not afford to have a bus that is not cost efficient to run. Case in point I had a bus go down in one school year 13 times and it had to be towed 10 of those 13 times because of brake issues at over $400 a pop.

Douglas Wood    |    Sep 04, 2013 04:15 AM

In the Jefferson County School Board v. Navistar over 400 buses with the V365 and MaxxForce 7 engines have experienced major problems with electrical and diesel dilution. Districts across the country are just taking it on the chin and fixing out of warranty buses at their own expense. What does Navistar plan to do about this?

Joe Collins    |    Sep 03, 2013 05:08 PM

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