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#3196029 - 11/23/13 08:13 PM Thermostat gasket sealant?
gr8gatzby Offline


Registered: 11/22/05
Posts: 524
Loc: Charlotte, NC
Replaced thermostat and gasket today. My dad says I need to rip it out again and throw some sealant on the gasket. Needed or not?

95 F150 5.8L
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#3196039 - 11/23/13 08:19 PM Re: Thermostat gasket sealant? [Re: gr8gatzby]
binkis Offline


Registered: 11/18/13
Posts: 14
Loc: Maryland U.S.A
No sealant just gasket less the intake be warped than try anything once

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#3196040 - 11/23/13 08:19 PM Re: Thermostat gasket sealant? [Re: gr8gatzby]
eljefino Online   content


Registered: 06/15/03
Posts: 22953
Loc: ME
Is it leaking? No? You're okay.

I prefer sealant as a preemptive "problem solver" in case there's a nick in either surface. I hate draining fresh antifreeze cleanly and trying to reuse it, so I like getting it done right the first time.

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#3196041 - 11/23/13 08:23 PM Re: Thermostat gasket sealant? [Re: gr8gatzby]
OVERKILL Online   content


Registered: 04/28/08
Posts: 24989
Loc: Ontario, Canada
I usually use the grey Motorcraft gasket stuff on either side of those as they can sometimes leak. But if it isn't leaking, don't worry about it.
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#3196051 - 11/23/13 08:35 PM Re: Thermostat gasket sealant? [Re: OVERKILL]
binkis Offline


Registered: 11/18/13
Posts: 14
Loc: Maryland U.S.A
I know some of them housing 's are plastic now an if ya overtorque em you'll crack em ain't no amount of sealant gonna fix it best bet don't break it n if its a metal one a gasket should do the trick I'ge done this a 1000 times I ain't never needed a sealer to do it an none never leaked less yer intake warped which wouldn't be the case Cu's I don't think you would run it around for days on end without any water in it?"

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#3196053 - 11/23/13 08:38 PM Re: Thermostat gasket sealant? [Re: binkis]
OVERKILL Online   content


Registered: 04/28/08
Posts: 24989
Loc: Ontario, Canada
Originally Posted By: binkis
I know some of them housing 's are plastic now an if ya overtorque em you'll crack em ain't no amount of sealant gonna fix it best bet don't break it n if its a metal one a gasket should do the trick I'ge done this a 1000 times I ain't never needed a sealer to do it an none never leaked less yer intake warped which wouldn't be the case Cu's I don't think you would run it around for days on end without any water in it?"


The way the 2-bolt housing/gasket/flange mount is on the Windsor, both being aluminum, sometimes there's some pitting or corrosion that causes them to leak with just the gasket. The sealer fills the imperfections (or sometimes they are just warped too and the sealer gets around that) and ensures they don't leak.
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#3196065 - 11/23/13 08:47 PM Re: Thermostat gasket sealant? [Re: gr8gatzby]
The_Eric Offline


Registered: 03/31/10
Posts: 2897
Loc: Iowa
NO leak? No problem.

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#3196070 - 11/23/13 08:51 PM Re: Thermostat gasket sealant? [Re: gr8gatzby]
oldhp Offline


Registered: 06/28/12
Posts: 701
Loc: Southern Illinois
Use the "Right Stuff" gasket maker lightly on both sides of gasket if leaking.
Flat sanding the housing and lightly flat filing the flange mount also help. Doubling the gasket works too.
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#3196186 - 11/23/13 11:25 PM Re: Thermostat gasket sealant? [Re: gr8gatzby]
andyd Offline


Registered: 09/25/04
Posts: 3426
Loc: Marshfield , MA
On aluminum stuff I use Permatex 2 Non hardening Aviation forma gasket. as a gasket sealer. It is great. I once put a waterpump with blue RTV because I had messed up the gasket. Yrs later , I replaced the WP because the engine was going into another car.. I had to use the butt end of a 2x4 to pound it off the timing cover.
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#3196233 - 11/24/13 12:47 AM Re: Thermostat gasket sealant? [Re: gr8gatzby]
Merkava_4 Online   content


Registered: 01/30/07
Posts: 7832
Loc: Clovis, CA
The gasket sealant makes the paper gasket waterproof. Keep an eye on it. If it
starts leaking, take the gasket back out and coat both sides with Permatex 2B.

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#3196302 - 11/24/13 05:04 AM Re: Thermostat gasket sealant? [Re: oldhp]
Rick in PA Offline


Registered: 01/04/03
Posts: 1936
Loc: Southeastern, PA
Originally Posted By: oldhp
Use the "Right Stuff" gasket maker lightly on both sides of gasket if leaking.
Flat sanding the housing and lightly flat filing the flange mount also help. Doubling the gasket works too.


Flat sanding is a good idea on aluminum housings. We use to do this at the garage I worked at as a young man. We'd take some sandpaper, lay it face-up on a glass counter top (any glass would do, it's a good hard & flat surface). And then gently "orbit" the housing on the sandpaper. It was interesting how the ears would generally brighten first, revealing a subtle warping of the housing. After a bit of sanding, the entire face of the thermostat housing would brighten, indicating the housing face was flat.
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#3196311 - 11/24/13 05:29 AM Re: Thermostat gasket sealant? [Re: gr8gatzby]
Donald Offline


Registered: 03/21/04
Posts: 12619
Loc: Upstate NY
If no leak, then leave it. If it leaks, then a new gasket with black Permatex.
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#3196327 - 11/24/13 06:44 AM Re: Thermostat gasket sealant? [Re: gr8gatzby]
Silverado12 Offline


Registered: 02/26/13
Posts: 522
Loc: Central Virginia
iF IT LEAKS, YOU MAY NEED A NEW THERMOSTAT housing. I use Permatex #2 on both sides of the gasket
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#3196406 - 11/24/13 08:41 AM Re: Thermostat gasket sealant? [Re: gr8gatzby]
DBMaster Offline


Registered: 09/18/12
Posts: 1744
Loc: DFW, Texas
Does it use an "o-ring" seal? In 355,000 miles and five thermostats my 89 Accord never needed any sealant applied to supplement the gasket. It had the type of rubber gasket that fit onto the the stat and had a raised o-ring profile at the edges.

Even on my 72 Pontiac, when I replaced the t-stat housing with an aftermarket chrome plated part that used an o-ring, I did not have to use sealant.

YMMV.
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#3196466 - 11/24/13 09:21 AM Re: Thermostat gasket sealant? [Re: Rick in PA]
The_Eric Offline


Registered: 03/31/10
Posts: 2897
Loc: Iowa
Originally Posted By: Rick in PA
Originally Posted By: oldhp
Use the "Right Stuff" gasket maker lightly on both sides of gasket if leaking.
Flat sanding the housing and lightly flat filing the flange mount also help. Doubling the gasket works too.


Flat sanding is a good idea on aluminum housings. We use to do this at the garage I worked at as a young man. We'd take some sandpaper, lay it face-up on a glass counter top (any glass would do, it's a good hard & flat surface). And then gently "orbit" the housing on the sandpaper. It was interesting how the ears would generally brighten first, revealing a subtle warping of the housing. After a bit of sanding, the entire face of the thermostat housing would brighten, indicating the housing face was flat.


I'd be surprised that he would be able to sand it flat, because many Ford t-stat housings have a small bead cast into them in the middle of the sealing surface.

Still, you do bring a good point that many housings can warp and leak.

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