Thread Sealant for Coolant Parts?

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Can you post a pic of exactly what fitting you are trying to seal ?

In fact, how about a pic of the sealant you have been using ?

And are you sure you are using Permatex thread sealant and not form a gasket ?
 
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Can you post a pic of exactly what fitting you are trying to seal ?

In fact, how about a pic of the sealant you have been using ?

And are you sure you are using Permatex thread sealant and not form a gasket ?

Tried both fittings, both leak water pump bypass, water pump and intake manifold. Thanks

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Those are pipe threads. Put some "thread sealant" on them and forget about it. That gasket snot you've got is not thread sealant.
 
Those are pipe threads. Put some "thread sealant" on them and forget about it. That gasket snot you've got is not thread sealant.

Both containers say for threaded assembly's. I have some Permatex high temp thread sealant, I will have to get some more, not enough. Thanks
 
One of those things.
I stay away from RTV even though that is everyone's '"go to."
Hey, it's cheap and every auto parts store has it.
Why not?
But as I have recommend before when it has come up, try this.
It was designed by Rolls Royce for aviation.
It works as a gasket dressing and for sealing those pesky exhaust fasteners on the water jacket

Read about it and try it.
Or not.
And no worries about pieces of it comming off and getting in a system.
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Both for gaskets, and not threads.
Get a tube of this. If it don't work, I'll eat my hat.

View attachment 1715500503

I have some of this, but not enough, I will get some more and try also. I ordered a tube of Hylomar blue like adriver recommended, I am getting real good at draining the coolant and taking the fittings in and out, so much fun I could just ****. Thanks to all of you.
 
Its possible the intake may have a crack from someone over-tightening the fitting.
 
Got it fixed with the HYLOMAR Compound, after three test drives, still no leaks. Hard to clean up, couldn't find the recommended HYLO CLEAN for clean up . Thanks to all again for your inputs...
 
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You can find this at your parts store and it's not cheap.. there's a reason why...
I use it on everything and have never had a drop on the floor of any fluid EVER...my2...

I used the red hi temp , and the right stuff in the past , have had just as good luck w/ ultra black , Easier to clean up that right stuff, and has worked as well as the hi temp for me --------
 
Most of the fittings on the water side of the block are pipe thread. Pipe dope, aka, pipe thread sealant from plumbing suppliers usually work best for American NPT pipe. The block plugs, bypass hose, big block heater hose fittings are all standard tapered pipe threads. If the female side is worn, damaged or tapped too deep, you'll have a leak. Teflon tape, wound in the correct direction starting about 3/4 thread back with pipe dope over it can help seal minor problem threads.

The pure teflon pipe dope made by permatex is about the best I`ve ever used on pipe threads , and I`ve probly used more than most of u combined in 50 plus yrs of plumbing for a living. That being said , there are special dopes for special needs too .
 
Doesn't matter. You use what makes you happy and I will too.
I did a search in the manual and it was not mentioned...pertaining to the two 3/4 inch, water jacket, pipe plugs in the /6 cylinder head...what type of tread sealant to use. Red RTV, Non hardening Permatex, hardening Permatex, etc.?
Norm
 
I did a search in the manual and it was not mentioned...pertaining to the two 3/4 inch, water jacket, pipe plugs in the /6 cylinder head...what type of tread sealant to use. Red RTV, Non hardening Permatex, hardening Permatex, etc.?
Norm

Any of the RTV or Permatex #2 will work. I don't really have a preference between the two. I just reach and grab one or the other. Unless something is close to exhaust temp. Then I use red high temp RTV.
 
Both for gaskets, and not threads.
Get a tube of this. If it don't work, I'll eat my hat.

View attachment 1715500503
And if it doesn’t work, I’ll eat that hat after you pass it. :eek:
64907A16-0878-4D51-B2CD-682436AC7041.jpeg

Others need to pay attention to Permatex’s description on how this stuff works, the workability after applying, cure time etc.
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It’s the correct sealant for the application and not debatable, but you, I and others already know that! :lol:
 
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And if it doesn’t work, I’ll eat that hat after you pass it. :eek:View attachment 1715777269
Others need to pay attention to Permatex’s description on how this stuff works, the workability after applying, cure time etc. View attachment 1715777270 It’s the correct sealant for the application and not debatable, but you, I and others already know that! :lol:
I went by Oreilly's and got some. 5.39 for .02oz...man! Looked like Elmer's School Glue. :thumbsup:
 
I've seen teflon thread sealant dry out and crumble up and start leaking WAY too often to use it on anything. Ever. Again.
 
I just started using that but have the larger tube.
We will see if it lives up to the hype.
So far seems good.

I've never used that. Read nothing but good things about it though.
 
I’m a steamfitter by trade and have tried many different pipe thread “dopes”.
Rectorseal #5 is my favorite. It’s a soft set that will allow easier disassembly if the need ever arises too.
And it works excellent.
And is cheap.
 
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