water seems to be leaking from just infront of alternator mount has no cracks in block also spits water out the exhaust

any ideas y it is doing this?

i have also just replaced radiator 2 seems like water isnt running through it?

 

on the back of the block there is a long black pipe. coolant flows through that, the end going into the block is sealed with a big rubber o-ring i bet its leaking from tthere