Originally Posted by TimFreeh

It's a non issue since the important thing is the relationship between the IP and the crankshaft. Since the chain can't slip over the drive gears on the crank or the IP timer you can't really mess up the relationship between them.

Unhook the chain and drop it down into the crankcase, it will be easy to fish-out with a coat hanger when the head is off.

Be sure to remove the head with the engine at TDC, It will make re-assembly much easier.

If I were you I'd use a dial indicator to and the proper offset keys to get the valve timing spot-on, It's also a great time to use the drip method and set the IP timing right on the mark since it's very easy to turn the engine with the glow-plugs removed and it's easy to pivot the pump since the injection lines will not be installed.