Cylinder 6 Failed

[Envirotec]

The truck has approximately 550,000 miles and over 17,500 engine hours, all accumulated through local and regional driving. It is equipped with a Cummins X15 Efficiency Series engine rated at 450 horsepower and 1,650 lb-ft of torque, as I understand it. Routine tune-ups were not performed until I began working with the company. However, when the EGR service was completed, the plumbing and ports were not as heavily sooted and carbonized as expected.

During inspection, cylinder 6 was the only liner found to be smooth with a broken ring, while the remaining cylinders appeared to be in good condition. I was told that cylinder 6 may experience higher heat concentration compared to the others, which could be a contributing factor to the observed wear??