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Discussion Starter · #1 · (Edited)
Hi Folks
On my 57 Chevy Griffin ally rad I have a 1/2" NPT plug at the base which needs to be plugged. The initial top 4 threads at the top were not in great shape so I've carefully cleaned up the treads with a correct 1/2 NPT tap. I've installed a stainless 1/2" NPT plug with teflon white tape, just enough to wrap once around the plug. On filling the rad it's slowly leaking. Given the ally boss for these plugs are fairly weak at best, before I try anything else can you recommend the best way to stop the plug leaking?
I was thinking take the plug out and refit with a generous blob of Araldite around the treads? The rads now off the car.
Cheers
Al
 

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Is it a taper seal thread or parallel thread?

If its parallel, use a dowtey seal as you dont have to go very tight to get a good seal. If its a taper thread, I'm sure some loctite thread sealant would work fine if PTFE tape doesn't seem to work.
 
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