valve adjustment done! great results and a question

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I finally adjusted the valves on my 82 240D today; I'm relatively new to the diesel diy scene, and after doing oil changes, trans and differential fluid change, egr/vac simplification, glow plugs, and similar things, I had been somewhat apprehensive of this highly recommended job.

Well, I finally got up the courage to do it. Getting the cover off and clearing the linkages was not hard. I tried turning the engine by turning the rear wheel in 4th gear (manual trans); but this did not work at all--the wheel just turned, without affecting the engine. Did I overlook something?
Anyway, my second choice was the ps pulley bolt, and that worked fine--not too much effort to turn the engine over.
Keeping track of Intake/Exhaust valves was easier than I thought--just look at the intake/exhaust manifolds.
I borrowed a set of the special wrenches.
The best part is the result: my 240D runs much smoother and faster! It's the best performance boost I've had yet!

A question, however: the torque for the valve cover is listed as 10 foot pounds. I did 10 pounds, but it seemed to me to be not enough, so I went ahead and torqued them to about 15-20. Am I going to regret this? Has anyone else overtorqued the valve cover and lived to tell about it?

Many thanks for all the informative posts which encouraged me to go ahead and do this job.