Fellas,

So I've got a leak from this hole in my water pump. This is just above where the lower coolant hose flows into it.

I believe that there is supposed to be a bolt there that has somehow worked itself out? Obviously it isn't holding any coolant now as it just drains straight out of there. What sort of replacement bolt can I get to fit in there or am I completely off base?

Apologies for the crap picture, it was the best angle I could get work without removing the fan belt.

 

That is 100% the Water Pump Weep Hole and it DOES NOT have any type of bolt or plug.

If the coolant is leaking from the weep hole it means the inner shaft seal is toast and it's time for a new water pump ( STC4378 ).
So by design the weep hole is doing its job because the seal failed.

 

Awesome thanks!