1987 300D how do I relace Serp belt?
 

I did a search, couldn't come up with anything, Thanks

Here's a link:
http://www.w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Engine/602_603/13-1202hw.pdf

The fan shroud doesn't have to removed, but it makes it more annoying.

This thread provides more details than you need for just a belt replacement, but should give you exactly what you are looking for: http://www.peachparts.com/shopforum/diesel-discussion/312419-diy-1987-300d-serpentine-belt-tensioner-replacement.html

This is a great thread.

The real trick is to use the handle of the lug wrench to relieve the tension, once you get the nut/bolt loose.

Probably my least favorite thing is getting that fan off, but boy is life easier once it is out of the way.