Recent Topics
NAPA ProSelect 21358, 4,400 miles CUT OPEN
by car51
03/23/17 03:06 PM
Parts Plus PH 2876, 5,000 miles CUT OPEN
by car51
03/23/17 03:01 PM
Another fantastic Craigslist tire score!
by Drew99GT
03/23/17 01:35 PM
Is this mower safe to use?
by Atesz792
03/23/17 12:39 PM
We are Marshall
by HosteenJorje
03/23/17 12:18 PM
OCI on little used vehicle
by ALR
03/23/17 11:46 AM
hood adjusters/adjustment
s

by mjoekingz28
03/23/17 11:00 AM
Carquest Filters
by SavagePatch
03/23/17 10:42 AM
Want To See A Doctor?
by AirgunSavant
03/23/17 10:08 AM
Mazda CX-5 UOA
by dmhudson91
03/23/17 09:26 AM
Valve Adjustments on newer Honda's
by Phishin
03/23/17 09:24 AM
Mobil 1 HM 5w30, 6.8K OCI, 2006 Expeditition, 172K
by meborder
03/23/17 08:52 AM
Replace or carry on
by 604Maxximus
03/23/17 08:30 AM
Wheeler Dealers, Ed China is leaving the show
by wemay
03/23/17 07:37 AM
Castrol GTX 5W30 5,300 km; '02 Olds Alero 3.4
by JHerriot
03/23/17 07:36 AM
Where is Humanity headed?
by SkyActivG
03/23/17 04:04 AM
Saab V6 Turbo oil recommendations
by FlyPenFly
03/23/17 03:13 AM
Oil and filters as gifts.
by Black_Thunder
03/23/17 12:13 AM
I mixed Amsoil 10w40 DB and Motul 300v 4t 10w40
by trod30
03/22/17 11:49 PM
Dogs in WalMart
by AZjeff
03/22/17 10:44 PM
Newest Members
Skybolt, Enrike, gschabel, rdc0000, anthnson1
60943 Registered Users
Who's Online
77 registered (Alfred_B, 4WD, 97f150, 86cutlass307, Astro14, aquariuscsm, 4 invisible), 2282 Guests and 11 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
60943 Members
66 Forums
262684 Topics
4336924 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#3196029 - 11/23/13 08:13 PM Thermostat gasket sealant?
gr8gatzby Offline


Registered: 11/22/05
Posts: 599
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
_________________________
'95 Ford F150 | 4x4 | 5.8 | 13MPG
'96 Volvo 850 Wagon | I5 | 5SP | 24MPG

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


Registered: 11/18/13
Posts: 19
Loc: Maryland U.S.A
No sealant just gasket less the intake be warped than try anything once

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


Registered: 06/15/03
Posts: 30496
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.

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


Registered: 04/28/08
Posts: 33218
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.
_________________________
2016 Durango Limited
2016 Grand Cherokee SRT

Top
#3196051 - 11/23/13 08:35 PM Re: Thermostat gasket sealant? [Re: OVERKILL]
binkis Offline


Registered: 11/18/13
Posts: 19
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?"

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


Registered: 04/28/08
Posts: 33218
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.
_________________________
2016 Durango Limited
2016 Grand Cherokee SRT

Top
#3196065 - 11/23/13 08:47 PM Re: Thermostat gasket sealant? [Re: gr8gatzby]
The_Eric Online   content


Registered: 03/31/10
Posts: 5076
Loc: Iowa
NO leak? No problem.
_________________________
2005 Lincoln Aviator 4.6 DOHC
2000 Honda Accord 2.3
2001 Hyundai Elantra 2.0
1979 Ford F-150 351M

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


Registered: 06/28/12
Posts: 1278
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.
_________________________
2016 Challenger R/T Hemi 6-speed.
2012 Equinox 2.4-Wife's Ride


Top
#3196186 - 11/23/13 11:25 PM Re: Thermostat gasket sealant? [Re: gr8gatzby]
andyd Offline


Registered: 09/25/04
Posts: 5357
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.
_________________________
1988 BMW 528e 20w50 dino, STP filter

1994 Ranger ,the Rat, 5w30 dino, STP filter

'09 Camry SE, Valvoline bulk 5w30 and ? filter

Top
#3196233 - 11/24/13 12:47 AM Re: Thermostat gasket sealant? [Re: gr8gatzby]
Merkava_4 Online   content


Registered: 01/30/07
Posts: 15462
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.

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


Registered: 01/04/03
Posts: 2985
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.
_________________________
A wise man told me:
"Heat is your friend." and "Any oil is better than no oil."

Top
#3196311 - 11/24/13 05:29 AM Re: Thermostat gasket sealant? [Re: gr8gatzby]
Donald Offline


Registered: 03/21/04
Posts: 18192
Loc: Upstate NY
If no leak, then leave it. If it leaks, then a new gasket with black Permatex.
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)


Top
#3196327 - 11/24/13 06:44 AM Re: Thermostat gasket sealant? [Re: gr8gatzby]
Silverado12 Offline


Registered: 02/26/13
Posts: 2291
Loc: Central Virginia
iF IT LEAKS, YOU MAY NEED A NEW THERMOSTAT housing. I use Permatex #2 on both sides of the gasket
_________________________
12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
15 Chevy Cruze 1LT auto
07 Harley Dyna Street Bob 96 c.i. 6 sp.
10 Mustang GT auto

Top
#3196406 - 11/24/13 08:41 AM Re: Thermostat gasket sealant? [Re: gr8gatzby]
DBMaster Offline


Registered: 09/18/12
Posts: 4573
Loc: Greg Abbott Land
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.

Top
#3196466 - 11/24/13 09:21 AM Re: Thermostat gasket sealant? [Re: Rick in PA]
The_Eric Online   content


Registered: 03/31/10
Posts: 5076
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.
_________________________
2005 Lincoln Aviator 4.6 DOHC
2000 Honda Accord 2.3
2001 Hyundai Elantra 2.0
1979 Ford F-150 351M

Top