I just am not having any luck with this 9N

[Ken(Ark)]

I am glad your optimistic , the water pump studs would be a booger if you had just been changing the water pump with the hood on , and that only happens when your working outside in 20 degree weather . At least these are not as critical as the head studs so the mental tension should be a little less - Ken(Ark)
 

[Joe (IN)]

Your thoroughness is commendable, but I personally would rather have the two hours of drilling and tapping to spend on something else. Time has taught me the value and wisdom of the old "If it ain't broke, don't fix it." All 4 of the N motors I've built left for the machine shop with the water pump studs still in them and came back and got assembled with them still there too. Chase the threads with a die and slap the pump on. BUT! I know how you think and work. What fun would that be, right?!? LOL! Good luck and keep up the good work.
 

[9NJoe]

Someone is playing a cruel joke on you. Have you broken any mirrors lately?
 

[Dan]

I serously thought about that before I started to remove them (remembering the recent 12 head studs I just drilled out) - but then I saw how corroded those studs looked and couldn't help myself I picked up three nice shiny new studs at lunch today...

Dan
 

[Matt Malcome]

Weld a steel nut on the end of the broken stud. Drilling it first helps. Use a mig welder welding the the stud first, then fill the nut with weld. Wait until the nut cools to black, then "plug" it with an impact wrench (fast trigger pulls). The heat penetrates the stud, is absorbed into the surrounding casting, and the broken piece should slowly come out. If stubborn, go forward, then reverse a few times. Fast and easy. I have retrieved many this way, and have hardly ever been beaten!!!