The car I am working on is a 93 300E. The problem I am having is that on occassion the car will not crank. If I move the shift lever the car will crank. I believe the problem is in the interlock switch that is to confirm the car is in park.

Is there any adjustment on this switch or linkage?

The Park/Neutral switch is on the drivers side of the TRANSMISSION! That is the starting point.

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Check the shifter rod bushings for wear/slop.
The Switch has 2 oblonged mounting holes that allow the sw. to be turned for adjustment...
These are common age failure item and prob just needs to be changed..

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1D00YU6RY1G80QDOUL&year=1993&make=MB&model=300-E-004&category=J&part=Neutral+Safety+Switch

Before you do anything or replace, try this: Spray switch and contacts liberally with WD 40. This switch gets lots of dirt and spray. I had this problem, and Wd 40 did the trick, Good luck, Abe G

If all else fails , put the lever in “N,” loosen the two bolts , there is a hole on the selector lever on the transmission that goes into the switch, insert a 4mm drill bit shank through that hole while moving the switch on its axis, tighten the bolts. That is the adjustment for the switch.