Re: I found a crack in an odd place while pressure testing
To have a crack, that's a pretty good spot to have it.
I would use a high quality epoxy such as Belzona or the like. You should be able to get at it from both sides. May need to make a tool of sorts to get it from inside, but I think you could reach around and down in from the water pump cavity.
Mechanical means (lock and stitch, welding, etc) will work as well.
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