I am still sorting out a coolant leak into the crankcase, even after replacing the impeller shaft mechanical seal but not the bearing. I do not recall seeing a seal on the inside of the case. Just the sealed bearing. I had one in hand but was rushed for time and it wasn't leaking before, spun freely and I didn't take the time. Now it has been almost another month and I hope I only have to replace the seal. It is possible I did not lubricate the seal properly so it did not do its job of keeping the coolant from the when I installed it but now I am going to try one more time.
No Brain - No Pain. I measure a man by the good he does for others, not his mistakes.