Vibrations from the tensioner and 116D idling

[Inspirli]

After my son recently purchased a 116d LC1 with a B37 engine, I am now researching the known issues and becoming increasingly anxious.

Upon first glance, I did not notice any signs of diesel dampness in the wiring loom; however, I will need to examine it more closely.

My question is this: the tensioner and top right pully seem to be bouncing around constantly when the engine is idling.
Once revved past 2000 rpm, it becomes more smooth.
Is it the usual?

[Sumoto]

In my opinion, that is not typical. What is the mileage on it?

[Inspirli]

87k

The red parts wobble around almost as if the tensioner were malfunctioning and working, releasing, and working, but the site won't let me upload the video.

[Inspirli]

etc., but it does become easier after you get high.

The dark pully beneath the arrowed one is likely the tensioner; I was wrong.

[Sumoto]

I would make sure the vibration damper (crankpulley) isn't splitting or weakening if the movement is excessive, though some movement is normal

[Inspirli]

very well

"https: //www.youtube.com/watch?v=1XRvL5CwrlU" is the video you're currently being shown.
At 08:32 There is a lot of back-and-forth mentioned regarding the tensioner.

[Inspirli]