Engine smoking not water

Just did a inframe on my cummins m11 . Had head done and remand injectors . Drove about 30 miles climbing hill and heard slite ticking from engine then smoke real bad , so bad someone call fire department . Pull over and had towed to my place . No water in oil , was dripping oil or diesel from turbo or both . My mechanic ( brother in law ) said he thinks it's a blown head gasket . Does this make any sense .
Looking for advice not sure he knows what he's doing

 

Can you explain better . Pull exhaust man . There is a main oil line going to turbo . Oil out of exhaust port ? Thanks I'm not a mechanic . So you think it's the turbo , is that what your saying .

 

Well took engine apart till I new what happened and found number one cylinder basically seized even though the others were still moving it . Piston has scratch all up and down it . Rings look melted in . Oiler at bottom of cylinder bent and doesn't even look like oil was going though it or maybe not even though the hole that goes to it . My mechanic doesn't know what happened ? Hmmmm

 

how can u clean the oiling system out .

 

My mechanic says he didn't break cooling nozzle when he took it out and says there is know way you can see if it's getting hit before running it . He says he put together right and takes no responsibly for its failure .