Need to rebuild my smog pump. 85 928 32 valve.
I found a link on rennlist but need a better explanation/pics. And a parts list.

Let me know what you got.

Thanks

 

Here's one:
Air pump rebuild (rennlist.com)

 

Many years ago I worked in a Porsche / Mercedes Benz dealership and there was an air pump rebuild kit for an MB that worked well in the 928 air pumps.
I can’t remember the part numbers but a good MB parts guy may be able to find it.