I don't even bother draining the rails. I just pull the glow plugs. Bar the motor over one revolution. Put the VC on with a couple of bolts, do not plug in the 42 pin connector, bump the starter for a few revolutions. Pull the valve cover back off, put everything back together.
Oh yeah, I lay a straightedge (2ft level) across the top of the injectors to make sure they are all the same height (lets you know the injector is seated).
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