Search again, there is no shortage of info on valve adjustments here. Use the advanced search function and do a "Titles Only" search on "valve adjustment." If you need pics look for posts that have attachments. Here is a good one from Cervan:

http://www.peachparts.com/shopforum/showthread.php?t=228645&highlight=valve+adjustment

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman