Hello, I have a 1993 M-B 300D 2.5 Turbo with the following problem. It starts right up when cold but then runs extreamly rough and may die until it warms up. Smokes badly during the early warm up and then runs normal. I have been told by an authorized M-B tech. that the probabal cause is badly worn pre-combustion chambers. Has anyone done this procedure without removing the Cyl. head and where can the tools necessary be bought or rented?

Thanks, Lgriffi