Three Failed Cummins Engines Reveal the Same Hidden Design Flaw Your HD Ram Truck Might Be Ready To Blow

The teardown of three failed fifth-generation Cummins 6.7-liter diesel engines–which are found exclusively in Ram 2500, 3500, 4500, and 5500 trucks–found the same issues in all three. Cummins changed the valvetrain in the 6.7’s fifth generation design in order to eliminate a necessary 150,000-mile maintenance interval. In doing so, says …

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