[urq] Can corrosion on the block be a problem where the water pump has that big round gasket.

[steven j]

I changed a water pump on a 5 cyl audi WE engine about 20 years ago and something in the back of my mind makes me think the block area that the pump sits on could corrode so that someday I won't get a good seal on that rather large diameter o-ring gasket the water pump uses, and doesn't the water pump adjust the timing belt tension?   This means the water pump might end up sitting right on the corrosion.     Am I way off base on my old memories or should I be prepared for difficulties?   I'm going to be working on both a WE and WX engine.