TR4/4A TR4 Water Drain Plug in Block

[KVH]

Should a new drain plug, or better said "water drain tap," be sealed with teflon tape or pipe dope? Or both?

I think I answered my own question: Both

 

[DougF]

I would use one or the other, but not both.

 

[TR4nut]

I think I put a little teflon tape on mine and it doesn't leak. Then again, I have enough sediment in the block that it doesn't much leak anyway even with the valve off!

 

[Andrew Mace]

I've never used any sealant on the "petcocks" on either block or radiator. As for plugs, they originally came with a fiber washer, as I recall, which seals fine.

 

[Geo Hahn]

I've been pretty much converted from tape to dope by comments on this list. Yes it's true -- I use dope because of these people.

I cannot recall but perhaps you have to stop at a certain position when threading in that petcock -- which may mean you can't get it as totally tight as you would like... in which case the dope might help.