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Using red RTV gasket maker instead of a real gasket when replacing thermostat? #5078242
04/17/19 09:14 PM
04/17/19 09:14 PM
Joined: Nov 2018
Posts: 29
Canada eh
PotatoFarmer77w Offline OP
PotatoFarmer77w  Offline OP

Joined: Nov 2018
Posts: 29
Canada eh
Hi all,

I have some left over Permatex High-Temp Red RTV Silicone gasket maker when I replacing the rear diff cover few years back. Now I’m going to replac the thermostat and just want to know if I can use this stuff as a gasket for the housing. On the package and the website it’s “recommended for thermostat housings” but I just wanna double check to make sure. The vehicle is a 95 Chevy k1500 with the 5.7 v8



Here’s the link:
https://www.permatex.com/products/g...matex-high-temp-red-rtv-silicone-gasket/

Last edited by PotatoFarmer77w; 04/17/19 09:15 PM.

1995 Chevrolet K1500 5.7 v8 - 333000km
2007 Ford Ranger 2.3 I4 - 100000km + 2007 Froest River Flagstaff Tent Trailer smile
2016 Mazda 3 2.0 I4 - 50000km
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078256
04/17/19 09:28 PM
04/17/19 09:28 PM
Joined: Dec 2017
Posts: 4,311
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline

Joined: Dec 2017
Posts: 4,311
SE British Columbia, Canada
Not a problem. Make sure your bead size is what they spec and follow the directions. Make sure the surfaces are totally clean. smile

Last edited by Snagglefoot; 04/17/19 09:29 PM.

If you want the job done right......do it yourself.
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078257
04/17/19 09:29 PM
04/17/19 09:29 PM
Joined: Jun 2003
Posts: 18,885
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 18,885
Deplorable in apple valley, ca
Clean both parts so that there is no oil. Put your goo on and finger tighten the bolts. Let it sit a few hours then final tighten them and add your coolant.

Works well. Many new cars dont use a gasket for things like this. Just goo as you described.


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Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078279
04/17/19 09:50 PM
04/17/19 09:50 PM
Joined: Jun 2002
Posts: 13,020
The Motor City
Kestas Online content
Global Moderator
Kestas  Online Content
Global Moderator

Joined: Jun 2002
Posts: 13,020
The Motor City
I prefer to make my own thermostat housing gaskets.

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: Kestas] #5078288
04/17/19 09:58 PM
04/17/19 09:58 PM
Joined: May 2010
Posts: 10,093
out there
spasm3 Offline
spasm3  Offline

Joined: May 2010
Posts: 10,093
out there
Originally Posted by Kestas
I prefer to make my own thermostat housing gaskets.

Thats pretty cool! Share how you do it!


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Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: spasm3] #5078295
04/17/19 10:10 PM
04/17/19 10:10 PM
Joined: Oct 2017
Posts: 988
Georgia
MParr Offline
MParr  Offline

Joined: Oct 2017
Posts: 988
Georgia
I’ve made thermostat housing gaskets out of the cardboard box the thermostat came in. You cut the box a bit larger than the housing. Take a small ball peen hammer and lightly tap out the cardboard while holding it to the housing. This gives you the perfect outline to trim by.


2019 VW Tiguan SE Now: Factory fill & OEM filter
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Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078299
04/17/19 10:12 PM
04/17/19 10:12 PM
Joined: Jun 2002
Posts: 13,020
The Motor City
Kestas Online content
Global Moderator
Kestas  Online Content
Global Moderator

Joined: Jun 2002
Posts: 13,020
The Motor City
It's rather easy. Trace the thermostat housing on gasket material and cut. Gasket material doesn't have to be anything fancy. You can use thick paper material sometimes used in packaging or even milk carton material.

Beats running down to the store and paying 50 cents.

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078354
04/17/19 11:35 PM
04/17/19 11:35 PM
Joined: Aug 2008
Posts: 3,652
Where the wind comes sweepin'
Reddy45 Offline
Reddy45  Offline

Joined: Aug 2008
Posts: 3,652
Where the wind comes sweepin'
You could use the cardboard box to make the gasket, and then keep some Indian Head shellac on hand to waterproof the paper before using it as a gasket.

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078360
04/17/19 11:58 PM
04/17/19 11:58 PM
Joined: Dec 2017
Posts: 4,311
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline

Joined: Dec 2017
Posts: 4,311
SE British Columbia, Canada
The OP was asking if red RTV gasket maker can be used as a gasket on a thermostat housing. Yes it can. smile


Last edited by Snagglefoot; 04/18/19 12:03 AM.

If you want the job done right......do it yourself.
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078385
04/18/19 01:47 AM
04/18/19 01:47 AM
Joined: Jan 2004
Posts: 5,201
California
nthach Offline
nthach  Offline

Joined: Jan 2004
Posts: 5,201
California
It'll work - as long as the silicone is still dispensable and it "kicks". No Dex-Cool or "all makes all models" coolant of course...

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078407
04/18/19 03:31 AM
04/18/19 03:31 AM
Joined: Apr 2015
Posts: 494
Reunion Island
Superflan Offline
Superflan  Offline

Joined: Apr 2015
Posts: 494
Reunion Island
I did make a gasket for an integrated thermostat housing (plastic so) bolting on aluminium engine. Using red silicone. I tightened right after applying and filled the circuit 2 hours later and went for a drive. It's been 7 months and 7000 miles and no leak so far!


‘01 Peugeot Partner 1.9 D, 5W40 A3/B4, 258000 Km, running on WVO
Wife's ‘01 Toyota RAV4 3-dr 2.0 VVTi, 5W40 A3/B4, 148000 Km
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078408
04/18/19 03:32 AM
04/18/19 03:32 AM
Joined: May 2005
Posts: 11,294
ROCHESTER, NY
Char Baby Online content
Char Baby  Online Content

Joined: May 2005
Posts: 11,294
ROCHESTER, NY
My BIL(48 yr diesel tech) always said that...you can't buy a gasket as good as what you can make with RTV.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078419
04/18/19 04:05 AM
04/18/19 04:05 AM
Joined: Jan 2011
Posts: 3,064
N.Ohio
Lubener Offline
Lubener  Offline

Joined: Jan 2011
Posts: 3,064
N.Ohio
For a small cost, I would do it right and get a gasket.


The "thinking" man's friend.
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: Lubener] #5078425
04/18/19 04:36 AM
04/18/19 04:36 AM
Joined: Jul 2005
Posts: 32,144
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 32,144
NY
If a gasket is available I'd buy one and use it, if not I'd make one. The RTV gasket maker I'd use a last resort. Opinions vary.


God Bless Our Troops

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: Kestas] #5078433
04/18/19 05:10 AM
04/18/19 05:10 AM
Joined: Sep 2013
Posts: 11,033
Indiana
dlundblad Offline
dlundblad  Offline

Joined: Sep 2013
Posts: 11,033
Indiana
Originally Posted by Kestas
It's rather easy. Trace the thermostat housing on gasket material and cut. Gasket material doesn't have to be anything fancy. You can use thick paper material sometimes used in packaging or even milk carton material.

Beats running down to the store and paying 50 cents.


What material do you use?

And yes, you bring a really good point.


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02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980 (Ecore)

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