The service manual for the W116 contains the OM617.950 and is available for your use at :

http://handbook.w116.org/matrix6.htm

This is the earlier version of the OM617 used on the W116 300SD, but should be close enough to support a teardown. I would look for the correct OM617.952 manual when you start measuring and rebuilding as there may be subtle differences.

Rick

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