http://www.mercedesdismantlers.com/diesel_vacuum_system#Diesel%20Vacuum%20System%20Troubleshooting
They have a few diagrams there as well.
It should be noted that the 85 D/SD diagrams posted above seem to be omiting the vacuum amplifier if not more.
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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K
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