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Old 08-20-2006, 10:51 PM
Samuel M. Ross Samuel M. Ross is offline
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Join Date: Dec 2005
Location: CA... No. of S.F.
Posts: 890
I applaud your desire to understand these...

various vacuum systems and sharing your findings with this FORUM. For me much of my initial learning about my diesel MZBs has been learing about these systems and how IMPORTANT they are for proper operation of these vintage cars.

Since yours is both a 1985 model and CA car, I challenge you to begin the process of learning about the vacuum system that is mostly located in the engine compartment and controls the tranny [ I'm assuming you have an automatic as most do]. Check out the links at:
http://www.peterschmid.com/vacuum/1977_1985/616_617_91/616_617_91.jpg ........... and
http://www.peterschmid.com/vacuum/1977_1985/617_95/1985_cal.jpg

I think yours is the latter. Make a copy for future reference of whichever is yours. Eventually I will have to take a closer look at my father-N-law's '85 300SD and I think it is the same as yours. Not looking forward to troubleshooting such a complicated vacuum system with so many components... included the dreaded "Control Unit"! I have started a THREAD about how "Critical" it is to understand the use of restricted orifices is to this vacuum system... and your's has 3+ such orifices. I started another THREAD on the vacuum lock system as well and ended up putting together a "user-friendly" diagram that some have found very useful.
Happy motoring,
Sam
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