How involved is replacing the timing chain/tensioner/etc. on a '81 300SD ?
I am comfortable with most light engine work.

Is there a standard parts list ?
Does it require proprietory MB tools ?
I have no way of telling if this was ever done on the car, which has 190,000 miles on the clock. I do not see a sticker indicating date/mileage of replacement.

Also, should I look into replacing the waterpump during this operation ?

The engine runs and great in all regards and gets 27+ on the highway.

Thanks