Wire brushing aluminum damaged it. You cleaned off old gasket, and a bit of the surface, too, leaving a rough, not flat surface to which you attached the pump.
Having coolant on the surface prevented the sealer from adhering to the damaged aluminum.
Can’t do much about the first bit, except to remember the lesson.
You need a dry surface, and a good, gap filling, sealer when you do this again. Many recommendations have been made. Good luck.
Having coolant on the surface prevented the sealer from adhering to the damaged aluminum.
Can’t do much about the first bit, except to remember the lesson.
You need a dry surface, and a good, gap filling, sealer when you do this again. Many recommendations have been made. Good luck.