Replaced your vibration dampener? Let me know if it did any good.

[Waterloo]

Cummins says replace every 500,000 miles... They wear out, the viscous fluid that does the balancing act drys out, and then the fun begins... I was continually losing the top adjuster pulley on my ISX, really chewing up belts. I changed the damper and that problem is gone. Also the motor really smoothed out, it had a vibration to it, that went away. Also the sound of the motor smoothed out, hard to explain, but it sounded different in a good way. I am glad I did it. When you paint, mark the timing markings in a different color for easy identification and then clear coat it.