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why is diesel vehicle blowing heavy black smoke?

my diesel vehicle is blowing heavy black smoke which has caused the manifold to leak from gasket as if it had blown at pressure - what is the problem?
needa 1, July 2008
for accuracy need to know engine speeds and conditions.ie smoke at all speeds.smoke at full throttle smoke at full load?every little bit of imformation narrows down diagnosis

caine, July 2008