Hmm. I can't really see anything wrong from the inspection plate.
Here is my thinking:
What spins at engine speed and then slowly slows down to ZERO
speed when you push in the clutch?
** Transmission input shaft and clutch disc **
So what could be causing a light tap-tap-tap noise? That follows this
behavior? It sounds like a valve tap. It's not a knock.
The transmission still shifts smoothly. The clutch does not judder or slip.
I don't think it could be throwout bearing related because the throwout
bearing goes from ZERO to full speed when you push the clutch in. I
would expect to hear throwout bearing noise when the clutch was IN,
not when the clutch is OUT.
Mine does the same thing. It's the three finger PP tapping on the TO bearing, or in my case the clutch fork, mine goes away with very light pressure on the pedal. I don't think anything is about to blowup on you.
Excellent! Perhaps when I popped the clutch I strained one of the
springs and the three fingers are no longer at the same level. Can
you adjust the level of the three fingers without pulling the tranny?