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+1 on it being the seals in the pump. This happened to me. Once water got past the first seal into the bearing, the shaft wore in the seized bearing and created a wobble in the shaft that destroyed the next seal, which sent water shooting right past the open 'weep' hole into the crankcase. The weep hole was definitely weeping, more like pouring, and cooling water was diverted from engine cooling to the bilge and the crankcase. The engine overheating was what clued me into the problem. The pump was completely failed, but the impeller was fine.
So, you may need a new shaft in addition to new seals. Having a working pump as a backup is a good idea.
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