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Old 12-01-2018, 09:51 AM   #1
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ISX 15 vs x 15

Has the X 15 cured the problems that the ISX 15 had?
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Old 12-01-2018, 09:59 AM   #2
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May be too new to know?
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Old 12-01-2018, 10:02 AM   #3
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Has the X 15 cured the problems that the ISX 15 had?
Based on Cummins anything made after the head update is ok.
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Old 12-01-2018, 10:05 AM   #4
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I wish that was true!
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Old 12-09-2018, 01:34 PM   #5
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Dumb question. When was the head update?
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Old 12-12-2018, 06:27 AM   #6
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Dumb question. When was the head update?
The first update was August 2014, then in April 2015 another update was put in place.

Do you know your engine number? Anything after 79832078 has the current items. Anything after 79764260 has the updated valves.
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Old 12-12-2018, 02:55 PM   #7
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Thanks Mark. I know my coach was built 11/14 and will check engine number.
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Old 12-12-2018, 03:12 PM   #8
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The catch on the older ISX's us that the parts were streamlined in. The older parts were used first then, when those ran out they used the new ones and Cummins has no way of tracing when the new valves actually went into which heads or at least not to those outside the company.
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