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The water pump has 3 seals, 2 on the cylinder of pump with a drain located at back of block between. Them in case of leaks, but this drain blocks up. The third seal is the pump shaft seal. When changing the pump there is a drain plug at back of block so when you pull pump out you dont fill the sump with coolant, maybe they didnt!
If youve lost that much coolant into oil, the fact you are hydrauliced by the sound of it, maybe head gasket has gone and you got coolant in the cylinders. Pull the heater plugs turn it over see if its easier and if coolant comes out of heater plug holes.
I would defo do some. Hecks like coolant jacket pressure test, cylinder pressure test and see what is going on.
 
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