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Just buy a 1/2" NPT tap--assuming there are still enough threads left to chase. Otherwise, Helicoil or equivalent. I'm sure you can find a bushing that would work, too. Replacing the volute of the pump would likely be around $300-400.
Once again, if it's 1/4" NPT, drill and tap to 3/8" NPT. $20-30 of cheap tools for a one-time job, and cast iron drills and taps like butter.
Indeed. Buy a 3/8" NPT tap and 37/64" bit. You should be able to walk out for about $20 or less. You don't need the really good stuff as you're drilling and tapping cast iron--and probably only using it once. An adjustable wrench is fine for driving the tap and you don't need to take the pump apart--unless you feel like a rebuild of the pump seal and gaskets.
It is tapered, as it's a pipe thread--National Pipe Thread, even.
Yep. That's why you need to do the tapping iteratively.
Yes.Thanks again. Lots of learning here. Finding this stuff locally isn't happening other that a plumbing distributer at professional prices.
Looks like Amazon.
Should I put valves on so this hopefully doesn't happen again?
Harbor Freight (or Princess Auto or whatever it's called up there) carries a set of pipe thread taps for not much money. Be careful on depth when tapping tapered threads. Start at 1/3 depth or so, then back it out and try the fitting....then give it another turn at a time until you've got it where it you want it.Thanks again. Lots of learning here. Finding this stuff locally isn't happening other that a plumbing distributer at professional prices.
Looks like Amazon.
Should I put valves on so this hopefully doesn't happen again?
I was thinking drilling the hole bigger then braze a bushing in. Bushings are cheap
If you get the tap set, it will have both 1/4" NPT as well as a 3/8" NPT. I'd start with the 1/4" and try to clean up whats there, and try a new 1/4" NPT fitting to see if it catches enough thread to tighten appropriately. Use some pipe dope to prevent galling. If not, then step up to the next size, 3/8" NPT.
I dont think it has enough taper to make up for stripped threads. Far from an expert on this, though
Deeper yes, but the wall thickness isn't sufficient to go deep enough to get enough thread I think. You might be able to enough thread engagement to hold it and rely on rtv to seal it up
Personally, I'd use a ball valve over one of thoseI assume those plugs are for draining.
I would put in small petcocks after the stripped thread issue is resolved. Looks like many radiator petcocks are of this size.
for most folks that would probably be a job for JBWeld and duct tape... whatever holds just long enough to sell.
They good quality or off shore?
Good idea. I changed my order. But will these get clogged if there are any debris? It is pumping from the lake. I guess I could poke a stick in to free anything.I assume those plugs are for draining.
I would put in small petcocks after the stripped thread issue is resolved. Looks like many radiator petcocks are of this size.
