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Freeze plugs

O

Old560

Member
Do any of you use a sealant when you put in freeze plugs? Or install them dry? I just installed two with permatex sealant and they are leaking. Now I get to redo the job.
 
I use hardening permatex. Which style of plugs ? If the curved type that sit against a ledge and you smack them flat to tighten them up maybe they need hit harder. I had some do that. I didn't hit them real hard to fear cracking the block as the side of the block seemed real thin.
Once in the machine and warmed up they all leaked. So I got a big punch and hammer and smacked them all harder.
 
Did you clean the holes good with some fine emery cloth? I used that funny smelling permatex thats non hardening and kind of gooey. Did you use the right kind of installer? I have used giant sockets but I think the tools made for that do it right.
 
after cleaning up the hole the only thing I use on a plug is INDIAN HEAD sealer..
Comes with it's own dobber.. Great for anything antifreeze is close too.
 
Like others said, the hole needs to be clean.

I've used Permatex with good success.

The cup type need to be driven on the edge, not in the middle, and driven in straight. Hitting the middle draws the sides in, makes for a loose fit, so does getting it cocked in the hole, collapses the sides inward.

If they are in a difficult place, I have used the copper expandable type with the brass acorn nut in the middle. They tap in easy, expand out tight. Never had one leak, won't rust.
 
(quoted from post at 17:19:21 04/25/18)
The cup type need to be driven on the edge, not in the middle, and driven in straight. Hitting the middle draws the sides in, makes for a loose fit, so does getting it cocked in the hole, collapses the sides inward.
Click to expand...
I don't see how flattening out the dome will make it smaller.
Should make it expand.
 
I agree.

I use silicone sealer, then find a socket that will just fit inside the plug and tap on the socket around the edges. You don't have to tap hard enough to damage the socket.
 
Are we playing with convex plugs that need to be whacked to expand them in place or "cup" type plugs?

Either way, if the "holes" they go in are CLEAN they should not leak without any sealant.

I make sure then holes are CLEAN and put 'em in with a smear of Loctite around the outside and have never had one leak.

Oh, yeah, one more thing, they ain't "freeze plugs".
 
the bores need to be clean clean. then use a socket the same size so it drives in on the edges. then hit the centre with a drift that takes up half the plug. yes good to use blue loctite. properly installed wont leak.

for the cup type just pound them in with a socket that fits outer edge and thats about it. you did not say what plugs you have.???
 
old I use aviation gasket glue, comes in a can with brush applicator, dark brown colour super sticky and hardens up in 24 hours to almost a glass like look to it. have used it on frost plugs on the old continental engines for years with good success.
 
"Oh, yeah, one more thing, they ain't "freeze plugs". "

Pretty sure most of the people on this site know that. But try calling them any other name to even a seasoned parts man and you get the deer-in-the-headlights look.
 
(quoted from post at 22:25:20 04/25/18) Welch plugs
Click to expand...

No, core plugs.

And the hole they fit into has to have a smooth bore, no pitting.Not just "clean".
The rougher the bore, the more goopy sealant you will have to use.

If you can flatten out the disc style, the plug is too small for the hole. You have eliminated the outward "spring" force of the design.
 
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