hey...
I just did my injectors as well on my 240D. (about 5 days ago)
I think you should have torqued the injectors just for the fact that 60 foot pounds is nothing. When I took the injectors off I had to use a cheater pipe to get them off but when I installed them back I used one hand to tighten them. I did use a torque wrench as well.
Here is the thread that I had going a few days ago; check it out it may be of some help to you:
I installed my new Injectors and now I need help.... PICS
kamil