Here is the guide on using this Mercedes Benz WIS online (workshop repair manuals). We hope it can help some people.
(click to enlarge images)
First of all, we choose its type: (example Class E W210)
Then, its engine: (example 320 CDI M613.961)
Then, we choose the section that interests us: (example, the air supply part with turbo )
We take the opportunity to select the language (on the menu at the top of the page) It’s easier to understand.
Then, the subsection: (example the turbocharger)
And finally, we specify: (example, removal, installation of the exhaust gas turbocharger)
We arrive at the desired file:
We even have the possibility to access, as we go, to shortcuts for intermediate stages in the procedure: (example: remove, install the lower parts of the soundproofing fairing)