Used RTV high temp silicone to seal my thermostat housing how long should i wait? - Jeep Wrangler Forum
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Old 01-20-2013, 04:28 PM   #1
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Used RTV high temp silicone to seal my thermostat housing how long should i wait?

I had a crack in my old thermostat housing that was causing a pretty good leak so i had to replace it. I read on a previous thread to get a good seal on the new thermostat housing to use red high temp RTV on both sides of the new gasket before installing so i did the directions on the tube say let dry for 1hour and to fully cure 24hours do i need to let my jeep sit for a day before adding any fluids and letting the engine get warm?

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Old 01-20-2013, 04:33 PM   #2
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1 hour add fluid, check for leak, 24 hours start it up, check for leak. ive never had rtv not leak after the first time. the cardboard gasket is good enough on its own.

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Old 01-20-2013, 07:19 PM   #3
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Personally, I would have not used any RTV on the thermostat housing at all. It doesn't take much to get a good seal there, today's gaskets do a good job at sealing the water pump, thermostat housing, etc. Heck I had a trail overheating emergency where I had to remove the thermostat housing & then put it back together using only a piece of cardboard from a MRE container box as the gasket. Even that makeshift cardboard gasket was completely leak free until I could get around to installing a new thermostat & a "real" gasket.
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Old 01-20-2013, 07:32 PM   #4
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you could use the cardboard box the thermostat came in to make a decent gasket.
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Old 01-20-2013, 07:33 PM   #5
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Ive always just used a very light coating of rtv on the gasket and pop in and fill up and go. The coolant will surface cure the RTV and the heat will cure it completely in minutes.
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Old 01-20-2013, 07:38 PM   #6
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Quote:
Originally Posted by tallzdatank View Post
you could use the cardboard box the thermostat came in to make a decent gasket.
Exactly. Which is not to say cardboard is the best material to use, it's just saying that it doesn't take much to seal the thermostat housing. RTV is not needed or recommended by the factory.
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Old 01-20-2013, 07:52 PM   #7
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thats not to say I don't keep a tube with me all the time just in case, but its never my first, second, or even 3rd choice. I keep it for emergency only.
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Old 01-20-2013, 10:41 PM   #8
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A skim of Indian Head shellac to hold the gasket in place while I get it bolted up is the closest I come to silicone. Hate the stuff, on the Jeep that is
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Old 01-20-2013, 11:15 PM   #9
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I guess I'll answer the OP's question, since he already used RTV.
No need to wait. Just fill it and go. I've been using RTV on T-stat gaskets for 25 years, and have never had an issue.

And I don't mean a huge bead that squishes out everywhere. Just a nice, thin coat.
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Old 01-20-2013, 11:40 PM   #10
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Quote:
Originally Posted by Patrick H View Post
I guess I'll answer the OP's question, since he already used RTV.
No need to wait. Just fill it and go. I've been using RTV on T-stat gaskets for 25 years, and have never had an issue.

And I don't mean a huge bead that squishes out everywhere. Just a nice, thin coat.
Quote:
Originally Posted by tallzdatank View Post
1 hour add fluid, check for leak, 24 hours start it up, check for leak. ive never had rtv not leak after the first time. the cardboard gasket is good enough on its own.
Hmm

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