Blown EGR cooler on a Mercedes MBE 4000 engine?

[ichudov]

I have a truck that failed on the highway, emitting huge amount of white smoke. I picked it up with my lowboy and brought it back to my shop.

Here's what I observed:

1) Huge amount of white smoke on highway, especially when I pushed on gas
2) Antifreeze leaked out onto the hot turbo, resulting in white smoke
3) Bubbles in reservoir
4) The EGR cooler line was blown open near where the "membrane" was connecting that line to the line going to the engine block
5) When I pushed gas pedal I heard knocking type sounds like exhaust gas was leaking before the muffler would quiet it.

Anyhow. I guess the question is what to do and whether we can fix it and also whether we can fix the right things and not the wrong things.

What I am afraid of is that

1) EGR cooler failed because of something specific, some other problem,
and not just from age (340k miles)
2) Maybe bad EGR cooler caused some other problems needing to be diagnosed?

any ideas?

thanks!