As I was pulling the bowl off my pump last week to inspect the impeller clearances, seals, etc one of the 1/2" bolts that holds the bowl onto the suction housing gave me some trouble. After soaking it for hours in penetrating oil it would still not budge and after resorting to a breaker bar, the head broke off.
Now, there is about 7/16" of bolt shank sticking out of the bowl but I'm not sure of the way to remove it. In the past it's always been drill it out and stick a helicoil in but it seems like it would be really easy to damage the sealing surface of the bowl trying to drill out such a large bolt. Also not sure how the helicoil will stand up.
Any thoughts on the best way to go about repairing this?