The rocker arms will be removed for access to the spring, etc., so the valves won't open. I'm sorry I referred to them earlier, as that was misleading. According to the mb.braingears.com online manual:

Step 3: Turn piston of wanted cylinder to TDC. Using tool combination, turn crankshaft for this purpose.

I have a deep 27mm socket, and a remote start switch if I can get away with using it. But how do I know when the cylider has reached TDC

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1982 300D, black w/ palomino leather, 203K
2001 E320, champagne, 105K (Mom's)
1999 Dodge Dakota, squeaky & battered, 142K