Recent Topics
JASO vs. Auto Oil for non-wet clutch Powersports
by coachvonyo
6 minutes 42 seconds ago
Why Does Some Oil in Engine Smell "Worse"?
by Miller88
9 minutes 26 seconds ago
Kevlar covered v-belt question.
by mrsilv04
31 minutes 43 seconds ago
1991 yamaha xt600 NY registration questions.
by joegreen
Today at 06:18 AM
postal LLV wiper switch arm broke off
by Tuffy1760
Today at 05:07 AM
2GR-FE Water Pump Noise
by The Critic
Today at 03:36 AM
Castrol & Shell oil sale in Oz
by SR5
Today at 02:45 AM
UOA Mobil Delvac MX 15w40?
by nyumski
Today at 02:13 AM
2015 Silverado - Put some chrome
by Realtech214
Yesterday at 10:22 PM
Ticks!
by spasm3
Yesterday at 09:54 PM
shop didn't replace clamps on steering rack
by motor_oil_madman
Yesterday at 09:46 PM
First SSD on Xubuntu 16.04
by Eric Smith
Yesterday at 09:20 PM
Newest Members
myfarmertan, coachvonyo, ionix, Amtecol, DRAX392
57779 Registered Users
Who's Online
78 registered (A_Harman, 19jacobob93, 06AllAmerican, anl0109, B320i, 97f150, 7 invisible), 1246 Guests and 321 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
57779 Members
66 Forums
248395 Topics
4061824 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#3196029 - 11/23/13 08:13 PM Thermostat gasket sealant?
gr8gatzby Offline


Registered: 11/22/05
Posts: 596
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: 29063
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: 31383
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.
_________________________
02 Expedition
06 Charger R/T
14 Charger SRT-8

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: 31383
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.
_________________________
02 Expedition
06 Charger R/T
14 Charger SRT-8

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


Registered: 03/31/10
Posts: 4619
Loc: Iowa
NO leak? No problem.
_________________________
2001 Hyundai Elantra 2.0
1998 Chevy Malibu 2.4
1995 Pontiac Grand Am 3.1
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: 1164
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.
_________________________
2014 RAM Express 3.6/8 speed work truck.
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: 4773
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]
Happy Birthday Merkava_4 Online   content


Registered: 01/30/07
Posts: 13698
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: 2759
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 Online   content


Registered: 03/21/04
Posts: 16664
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
2001 Jeep Grand Cherokee Laredo 4.0- 4-sale
1999 Dodge Ram 2500 w/Cummins- 4-sale


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


Registered: 02/26/13
Posts: 1898
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.
99 Jeep XJ
Buy American.

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


Registered: 09/18/12
Posts: 3689
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 Offline


Registered: 03/31/10
Posts: 4619
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.
_________________________
2001 Hyundai Elantra 2.0
1998 Chevy Malibu 2.4
1995 Pontiac Grand Am 3.1
1979 Ford F-150 351M

Top