Is this the part/section to check for the belt tensioner: http://www.ps2cho.net/downloads/MB%20CD/W124/w124CD1/Program/Engine/602_603/13-343.pdf

Man.... that's really complicated - not sure I would want to tackle that one... maybe time to take it to the mech.

Also, the car has a very fast shake at idle - if you're sitting the driver's seat with your hand on the steering wheel, it will vibrate your hand and your teeth... it's fast and furious...

Is this further evidence of problem(s) with the belt tensioner device?!

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K