'97 xp

so i have a small crack in my exhaust right above the oil injector in my '97 xp. the water which cools the engine sprays out at a steady tiny spray. how could i seal it and is it worth it or should i just buy a new exhaust piece? its coming out of that circular piece protruding from the tube...

is there a way that the oil pump in a 97 xp (787) is faulty. i have a new engine in and fresh oil and gas and i bled the oil pump to get the air out but all i get is the new oil coming out the bleeder but the air pockets in the same exact place on the two little tubes going to the intake behind...