Re: Draincock from radiator

Posted by Owen_Dyneto On 2012/4/18 8:31:47

It's probably a pipe thread (NPT) which is a tapered thread, I'm not aware of helicoil repairs for that type of thread, though someone else may have other information.

You could try soldering the petcock into the tank lug. Or, if there's enough "meat" in the metal lug, it might be possible to drill and tap for the next largest pipe thread and then use a threaded NPT bushing to reduce that back down to the drain cock thread. Otherwise I suspect you'll need to have the lower radiator tank removed and repaired.

I don't know what year and model Packard you're inquiring about but if it's not a pressure cooling system, there may be some other workable though less than ideal solutions, for example an epoxy rated for that kind of service, perhaps J-B Weld? I'd feel a lot more comfortable with solder than epoxy.