the brass line should have been ok. You have to replace the injector heat shield and tighten the injector. A loose/leaky injector will create the knock and rough idle it shouldnt kill the injector or mess up a valve.
EDIT: refer to dieselgiants write up on the bosio nozzles. Towards the end where he explains the heat sheild, that should help you out.
http://dieselgiant.com/mercedesinjectornozzlereplace.htm
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