CM871 engine vibration

[ynot]

A bad vibration damper is pretty easy too diagnose, open the hood with the truck idling an watch the motor, as the vibration damper goes bad it'll start shaking the front of the motor noticably more then the rear. Mine when I changed it around 750k the front of the motor was shaking a good 2" one side too the other while trying to take back half with it.

There's also the water bottle test, set a half filled bottle of water on the top an watch too see if its move around up there or just sits still.