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This a problem that has plagued that motor. The only answer is a bad design. They did a recall for this issue. Check with your local dealer rep for Cat and see if they will still warrant this issue. Seeing as how Cat has stopped producing road engines you probably will not have good luck with this but I wish you well.

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Q: Why is the C-15 acert engine in a 2005 kenworth breaking rocker arms?
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What is the meaning of cummins isb engine?

The ISB is a 5.9 variant of the 6BT, manufactured after the implementation of ACERT emissions standards in 2002.


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Do you want to have no power at all? The M11 is a vocational truck engine... the way the truck is geared with the C15, I seriously doubt you want to stick an M11 in there. Not only that, but that's a post-ACERT truck... you can't put a pre-ACERT engine in it legally unless the truck was purchased as a glider kit.


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The N14 was a 14 liter, inline six, heavy duty diesel engine made prior to the implementation of ACERT emissions regulations in 2002.


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Engine Electronics and Effective after treatment.


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