No1.
I'd like to check out the timing on the car but the MB manual doesn't show how to properly do it with a stroboscopic gun. All I saw was something with dials and adjusting timing on the head itself.
2.Is there a way to visually inspect the plastic guides by simply removing the head cover.
3.And since the 420 engine is very close to the 560, why does it seem that the 560 is less prone to timing chain problems, would it be an upgrade to do to the 420.