4.8 (N62) water pump

[Aussiex5bimmer]

In the process of changing the thermostat at the moment to try and fix a poor heater performance. Using a mirror I looked inside the throat of the water pump (where the thermostat goes) and noticed a jagged edge (see photo). Can anyone tell me if this is normal or should I look at replacing the water pump as well?
20170724_125617 (1).jpg

[magnetchief]

Looks like erosion from the water. Maybe cavitation.



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[Aussiex5bimmer]

Thanks for that. Can anyone tell me how much metal is missing or perhaps post a picture of what the pump should look like from that angle. I don't have access to a pump to look and see.