Looks like it's coming along both nicely & quickly - cool.



Unfortunately, the brass impeller water pump is a bad idea on these motors. As the bearing gets to the point of being worn out (which is what causes the drip out the weep hole to notify you that replacement is imminent), the tension on the serpentine belt causes deflection of the impeller and shaft (this is what creates the leak with coolant passing by the seal). That impeller deflection with a composite impeller pump will slowly grind away the impeller fins as it contacts the engine block. If this goes on for too long, then larger pieces of the fins can break off and get lodged in the small coolant passageways creating hot spots, which is bad, but doesn't usually happen unless someone tries to get every last mile out of a water pump.



With the metal impeller pump, the deflection I mentioned above once the bearing is worn will cause it to contact the aluminum engine block, turning your water pump into a milling machine, which will permanently damage the block as it mills away the aluminum. This will reshape the housing in which the impeller spins creating less efficient pumping, even after the new pump is installed and if it mills long enough can actually create a permanent coolant leak that can't be fixed.



Only composite impeller pumps should be used on these engines to make the pump the sacrificial component and not the engine block.