This may help with turning the engine:

http://www.hevanet.com/patbob/MercedesK1SpringKit/SpringKitInstall.html

Scroll down a little at that link and take a look at the socket and description of how to use it.

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Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/

1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing

1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake.

Both on single tank WVO blend