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Old 06-15-2016, 12:50 PM   #1
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Cummins engine

Does anyone know if a 2007 Cummins 340 ISB 6.7l is a good model engine or did they have problems.
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Old 06-15-2016, 01:18 PM   #2
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Very few Cummins engines 'have problems.' Cummins does a lot of research an testing before releasing a new model. Often issues come up with meeting emissions standards, you'll have to do more research into what methods were used in 2007 models.
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Old 06-15-2016, 01:25 PM   #3
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Quote:
Originally Posted by Gladstone PE View Post
Does anyone know if a 2007 Cummins 340 ISB 6.7l is a good model engine or did they have problems.

Cummins has build more of the ISB than probably any other Diesel engine. Just understand that it's a light duty diesel and used in many pick up trucks and small delivery vans. If it's coupled with the Allison 3000 it's a great combo. More likely it's mated to one of the Allison 2000 series transmissions. The 2000 is less desirable but works ok with the ISB.

The ISB isn't a powerhouse but is generally turns in the best fuel economy in motorhomes.
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Old 06-15-2016, 02:22 PM   #4
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Cummins ISB

The reason I interested in this Engine is that its called an ISB however it is listed as 6.7 l and has a different bore and stroke then the normal ISB engine. I also believe it would be the largest ISB built.
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Old 06-15-2016, 03:07 PM   #5
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Cummins engine

The ISB displacement increased to the current 6.7 liter in '07. The older 5.9 version was also produced until '09 and may still be for certain applications. I'm guessing that all 6.7 liter ISBs are equipped with a DPF system.

This engine is perfect in a motorhome that is between 26-32,000 pounds. That's too heavy for the Ford chassis with gas V10. Depending on the $$$ level of coaches in this weigh range, you may find Cummins ISCs and some ISLs on the upper end of the weigh range. Up until '10 you may find some Cat C7s.
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Old 06-15-2016, 05:02 PM   #6
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The term ISB (Interact System B) was used on 5.9 L and was a electronically controlled Bosch fuel pump and injectors. Later versions used a common rail and Bosch injectors. In 2007 Cummins increased the engine from 5.9 L to 6.7 L. It has a cast iron block and head and is still in production today with some tweaks.

https://cumminsengines.com/powerspec-isb

http://cumminsengines.com/uploads/docs/4104003.pdf
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Old 06-15-2016, 06:33 PM   #7
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I have the Cummins ISB 6.7 in my Fleetwood Excursion, 31,000 pounds, 40,000 miles so far.
Last 2 trips totaled 1100 miles, half of the miles we were towing my old jeep YJ. I averaged 10.2 MPG, love the engine.
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