gasket sealant for thermostat housing gasket? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > gasket sealant for thermostat housing gasket?

** FALL SALE on all Jeep Optic Armor Windshields **Introducing MONSTALINER™ UV Permanent DIY Roll On Bed Line~Artec JK 1 TON SWAP~

Reply
Unread 09-09-2010, 11:28 AM   #1
TheNewbie
Registered User
1995 YJ Wrangler 
 
Join Date: Oct 2008
Location: Grand Jct, CO
Posts: 2,966
gasket sealant for thermostat housing gasket?

Do you use gasket sealant for the thermostat housing gasket? I replaced my thermostat last winter and the seal just started leaking again. I pulled it off and put a new gasket in but I smeared the RTV silicone a bit when I was trying to line the housing up with the head and it's leaking even worse now.

Can I just use the bare gasket, or is it required to use the RTV? IT seems like the silicone is what's making it leak because I can't get it perfectly even.

__________________
1995 YJ 2.5 - 4” RC lift - 1" MML - 33's - flat fenders front - TJ flares rear -Raptor lined exterior - Herc'd interior - DIY front bumper & winch plate - 136 amp alternator mod - 4.0 TB swap

My build thread...
I've got a shotgun, a rifle and a four wheel drive...
TheNewbie is offline   Reply With Quote Quick reply to this message
Unread 09-09-2010, 11:32 AM   #2
Chris
Guy with jeep
 
Chris's Avatar
1990 YJ Wrangler 
 
Join Date: Jul 2008
Location: Wildomar/ Big Bear, CA
Posts: 2,554
I have always used just a little bit of Blue RTV when I do mine, by little I mean a very very thin layer and that should not cause any leak because it kinda self levels when you bolt it back on. Maybe try black RTV.
Chris is offline   Reply With Quote Quick reply to this message
Unread 09-09-2010, 11:46 AM   #3
dtn8tr
Web Wheeler
 
dtn8tr's Avatar
1997 TJ Wrangler 
 
Join Date: Mar 2010
Location: Waconia, Minnesota
Posts: 1,276
I had a similar issue and it turned out to be operator error. If you get the gasket turned around it will go together but it leaves half of the passageway to the upper left without a gasket around it. This causes it to leak like a sieve. I have the gasket with just a little RTV on it and hasn't leaked since and that is about 4 months now.
__________________
1997 TJ, 4" ProComp, 33x12.5x15 Firestone Destination MT, JKS Quicker disconnects
sold-1988 YJ, 4.2L, 2.5" OME, .75" boomerangs, 33x12.5x15 Cooper Discoverers, Herc'd,Nuttered, TeamRush'd
2001 WJ stock DD, 4.0l, Select-Trac

Most good stories start out "Y'all ain't gonna believe this ****...."
dtn8tr is offline   Reply With Quote Quick reply to this message
Unread 09-09-2010, 11:52 AM   #4
Louie4
Powah Injanir
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh, NC
Posts: 9,894
I always use some gasket maker or RTV on gaskets just for assurance. I had the same problem with my thermostat housing. The last time I removed it I noticed how pitted the mating surface was on my housing so I took it to work and put a smooth finish on it. I bolted every thing back up with a new gasket and RTV and no problems since.

Oh I also cleaned the bolts good because they were very corroded on the threads.
__________________
Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline   Reply With Quote Quick reply to this message
Unread 09-09-2010, 11:56 AM   #5
tractor1
old dog
 
tractor1's Avatar
1979 CJ5 
 
Join Date: Jul 2009
Location: Lost In IL.
Posts: 574
Look at the housing make shure it is not worped from over tighting
tractor1 is offline   Reply With Quote Quick reply to this message
Unread 09-09-2010, 12:14 PM   #6
TheNewbie
Registered User
1995 YJ Wrangler 
 
Join Date: Oct 2008
Location: Grand Jct, CO
Posts: 2,966
The instructions on the packet of RTV said to apply a bead all the way around. I'll try just smearing a thin coat instead.
__________________
1995 YJ 2.5 - 4” RC lift - 1" MML - 33's - flat fenders front - TJ flares rear -Raptor lined exterior - Herc'd interior - DIY front bumper & winch plate - 136 amp alternator mod - 4.0 TB swap

My build thread...
I've got a shotgun, a rifle and a four wheel drive...
TheNewbie is offline   Reply With Quote Quick reply to this message
Unread 09-09-2010, 12:24 PM   #7
Chris
Guy with jeep
 
Chris's Avatar
1990 YJ Wrangler 
 
Join Date: Jul 2008
Location: Wildomar/ Big Bear, CA
Posts: 2,554
I always do a thin coat just because I don't like a whole bunch to be pushed in and out of whatever I an putting on. You ever pop something off and there is more gasket maker on the inside then anywhere else, I try to avoid that.
Chris is offline   Reply With Quote Quick reply to this message
Unread 09-24-2010, 10:45 AM   #8
TheNewbie
Registered User
1995 YJ Wrangler 
 
Join Date: Oct 2008
Location: Grand Jct, CO
Posts: 2,966
Well I got some of that black gasket maker in a can like spray cheese and put it back together with a gasket and that black gasket stuff. It was still leaking a little bit, so I pulled it off and put it back without a gasket. I just used a fairly thick layer of that gasket maker and bolted it back up.
I STILL have a leak. I sanded it by hand until it was shiney again, but I'm thinking it's got to be warped or something. Should I take it to my father in laws and use his belt sander to level it out, or maybe replace it? What else could cause this? The book says to tighten the bolts to 20 lbs. Thats seems really light, but I've tried that as well as tightening it more. Nothing seems to make a difference and I've been leaking at least a gallon of coolant a week.
__________________
1995 YJ 2.5 - 4” RC lift - 1" MML - 33's - flat fenders front - TJ flares rear -Raptor lined exterior - Herc'd interior - DIY front bumper & winch plate - 136 amp alternator mod - 4.0 TB swap

My build thread...
I've got a shotgun, a rifle and a four wheel drive...
TheNewbie is offline   Reply With Quote Quick reply to this message
Unread 09-24-2010, 10:57 AM   #9
remmons
Some assembly required.
2002 KJ Liberty 
 
Join Date: Mar 2010
Location: Vernal, Utah
Posts: 1,741
Quote:
Originally Posted by TheNewbie View Post
Well I got some of that black gasket maker in a can like spray cheese and put it back together with a gasket and that black gasket stuff. It was still leaking a little bit, so I pulled it off and put it back without a gasket. I just used a fairly thick layer of that gasket maker and bolted it back up.
I STILL have a leak. I sanded it by hand until it was shiney again, but I'm thinking it's got to be warped or something. Should I take it to my father in laws and use his belt sander to level it out, or maybe replace it? What else could cause this? The book says to tighten the bolts to 20 lbs. Thats seems really light, but I've tried that as well as tightening it more. Nothing seems to make a difference and I've been leaking at least a gallon of coolant a week.
I see that you are not that far away from me. I have done a lot of wheeling down that way, 21 Road being my favorite.

I use the Permatex #2 non-hardening sealant. I have never had any issues by using this product.

My question to you is this. Are you sure that it is coming from the water outlet, and not through the end of the coolant hose? Sometimes, a leak can occure internally on a hose, but it won't penetrate the outer surface. Instead, it would "wick" out, or migrate through the threads out the end of the hose.

Another thing to look at is this. Check for a crack in the water outlet housing. By torquing down on this, it can cause it to warp and/or crack. They're not meant to be torqued down too tight. Check with your FSM for the torque settings. Sometimes, by overtorquing you create a situation where the gasket "cracks" due to overcompression, or the housing will flex.

If you happen to have it off again, check it for trueness on something flat, then bring out your feeler gauges and see if you have any that slip under. If you do, then it is warped.
__________________
2002 Liberty Sport 3.7. 2.5" lift.

I am by no means a professional. I know just enough to get myself into trouble.

http://www.jeepforum.com/forum/f12/i...t-case-989208/
remmons is online now   Reply With Quote Quick reply to this message
Unread 09-24-2010, 11:23 AM   #10
TheNewbie
Registered User
1995 YJ Wrangler 
 
Join Date: Oct 2008
Location: Grand Jct, CO
Posts: 2,966
Quote:
Originally Posted by remmons View Post
I see that you are not that far away from me. I have done a lot of wheeling down that way, 21 Road being my favorite.
You'll ahve to let me know when you're coming through to go wheelin'. I like Billings canyon too if you jsut want to screw around for the day. There are a lot of playgrounds and waterfalls to toy with.

Quote:
Originally Posted by remmons View Post
My question to you is this. Are you sure that it is coming from the water outlet, and not through the end of the coolant hose? Sometimes, a leak can occure internally on a hose, but it won't penetrate the outer surface. Instead, it would "wick" out, or migrate through the threads out the end of the hose.
I'll check that out. The hoses probably need replacing anyway.

How much could that leak? Also, it seems to leak a different amount every time I re do the seal.
__________________
1995 YJ 2.5 - 4” RC lift - 1" MML - 33's - flat fenders front - TJ flares rear -Raptor lined exterior - Herc'd interior - DIY front bumper & winch plate - 136 amp alternator mod - 4.0 TB swap

My build thread...
I've got a shotgun, a rifle and a four wheel drive...
TheNewbie is offline   Reply With Quote Quick reply to this message
Unread 09-24-2010, 11:23 AM   #11
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,082
I never use a gasket on any thermostat housing. BUT, I always mill the housing flat and make sure the mating surface on the head is also flat.

A thin bead of red hi-temp RTV. Have done many like this, and not the first leak yet.

Most folks warp the housing by improper installation of the gasket, they will never stop the leak once the housing is no longer true.
__________________
418 miles on 19 gallons of gas. Can't beat the BBD !
Old4X is offline   Reply With Quote Quick reply to this message
Unread 09-24-2010, 11:25 AM   #12
TheNewbie
Registered User
1995 YJ Wrangler 
 
Join Date: Oct 2008
Location: Grand Jct, CO
Posts: 2,966
Quote:
Originally Posted by Old4X View Post
I never use a gasket on any thermostat housing. BUT, I always mill the housing flat and make sure the mating surface on the head is also flat.

A thin bead of red hi-temp RTV. Have done many like this, and not the first leak yet.

Most folks warp the housing by improper installation of the gasket, they will never stop the leak once the housing is no longer true.
OK, so should I just put it on a belt sander and get it flat, or replace it just to be safe?

I have tomorrow off. I guess I know what I'll be doing.
__________________
1995 YJ 2.5 - 4” RC lift - 1" MML - 33's - flat fenders front - TJ flares rear -Raptor lined exterior - Herc'd interior - DIY front bumper & winch plate - 136 amp alternator mod - 4.0 TB swap

My build thread...
I've got a shotgun, a rifle and a four wheel drive...
TheNewbie is offline   Reply With Quote Quick reply to this message
Unread 09-24-2010, 11:35 AM   #13
dtn8tr
Web Wheeler
 
dtn8tr's Avatar
1997 TJ Wrangler 
 
Join Date: Mar 2010
Location: Waconia, Minnesota
Posts: 1,276
Quote:
Originally Posted by TheNewbie View Post
Well I got some of that black gasket maker in a can like spray cheese and put it back together with a gasket and that black gasket stuff. It was still leaking a little bit, so I pulled it off and put it back without a gasket. I just used a fairly thick layer of that gasket maker and bolted it back up.
I STILL have a leak. I sanded it by hand until it was shiney again, but I'm thinking it's got to be warped or something. Should I take it to my father in laws and use his belt sander to level it out, or maybe replace it? What else could cause this? The book says to tighten the bolts to 20 lbs. Thats seems really light, but I've tried that as well as tightening it more. Nothing seems to make a difference and I've been leaking at least a gallon of coolant a week.
Is that 20in/lbs or 20ft/lbs?
__________________
1997 TJ, 4" ProComp, 33x12.5x15 Firestone Destination MT, JKS Quicker disconnects
sold-1988 YJ, 4.2L, 2.5" OME, .75" boomerangs, 33x12.5x15 Cooper Discoverers, Herc'd,Nuttered, TeamRush'd
2001 WJ stock DD, 4.0l, Select-Trac

Most good stories start out "Y'all ain't gonna believe this ****...."
dtn8tr is offline   Reply With Quote Quick reply to this message
Unread 09-24-2010, 12:18 PM   #14
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,082
Quote:
Originally Posted by TheNewbie View Post
OK, so should I just put it on a belt sander and get it flat, or replace it just to be safe?

I have tomorrow off. I guess I know what I'll be doing.
Doubtful a belt sander will give you enough control. A large sharp mill file is what has worked well for me. And check for true with a steel straight edge.
__________________
418 miles on 19 gallons of gas. Can't beat the BBD !
Old4X is offline   Reply With Quote Quick reply to this message
Unread 09-24-2010, 01:23 PM   #15
superj
Registered User
1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,597
you can put a square piece of sand paper on a table or bench and sand in figure 8s to make it square also.
__________________
Slow ride, take it easy
superj is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.