Question About Thermostat Housing Gasket

Dan_T_Mustang · December 29th, 2011, 04:20 AM

I have a bit of a leak coming from the thermostat housing so I decided to change the gasket, the first one I bought was really thin and still leaked after the install, got a new one today made of cork and hoping it will do the trick, the question is, should I apply RTV silicone as well or will that damage the gasket? Also I plan on lightly sanding the mating surfaces to ensure they're both clean and flat.

Dan_T_Mustang · December 29th, 2011, 04:39 AM

ttt

RedDevilGT · December 29th, 2011, 04:50 AM

Yes, make sure you get all dirt/debris off of the surface. Applying RTV around the gasket will not hurt anything at all. In fact, I did that the last time I changed my thermostat on my 01' and I haven't had any problems at all.

Dan_T_Mustang · December 29th, 2011, 05:22 AM

Also one side of the gasket is a stick on type so like a sticker, should I apply RTV on that side or no?

RedDevilGT · December 29th, 2011, 05:47 AM

No need to, what I did was put the gasket on the thermostat like normal and tightened the bolts, then I went around they faying edge with the RTV.

furreal302 · December 29th, 2011, 02:37 PM

I usually apply a thin layer, it helps keep the gasket in place while installing. If both surfaces are clean it will seal fine without.

Bubba95SN · December 29th, 2011, 06:22 PM

Use brake clean on mating surfaces to remove oil coolant residue. Sanding housing on flat surface to remove imperfection and sanding with block on intake will help to seal. I use Fel Pro gasket. If using rtv, do so sparingly. No need for restriction from excess.

furreal302 · December 29th, 2011, 10:22 PM

Originally Posted by Bubba95SN

Use brake clean on mating surfaces to remove oil coolant residue. Sanding housing on flat surface to remove imperfection and sanding with block on intake will help to seal. I use Fel Pro gasket. If using rtv, do so sparingly. No need for restriction from excess.

+1
Good point. I've seen many jobs done with excess silicone squished out the sides of the surface. My own Mustang had a leaky differential because someone used RTV like it was glue. When I do a gasketed surface, I spread it thin like mayo.

December 29th, 2011, 04:20 AM	#1
Dan_T_Mustang Newbie 1995 Mustang GT Join Date: Apr 2011 Location: British Columbia, Canada Posts: 25 iTrader: 0 reviews	Question About Thermostat Housing Gasket I have a bit of a leak coming from the thermostat housing so I decided to change the gasket, the first one I bought was really thin and still leaked after the install, got a new one today made of cork and hoping it will do the trick, the question is, should I apply RTV silicone as well or will that damage the gasket? Also I plan on lightly sanding the mating surfaces to ensure they're both clean and flat. __________________ Hurst Billet/Plus SST Short Throw Shifter, 1999 SVT Cobra Wheels, BBK O/R H-Pipe, Flowmaster American Thunder Catback Exhaust System, 5% Window Tint On Back 3 Windows, Eibach Pro-Kit Lowering Springs, Eibach 1" Wheel Spacers, BBK Cold Air Intake.

December 29th, 2011, 04:39 AM	#2
Dan_T_Mustang Newbie 1995 Mustang GT Join Date: Apr 2011 Location: British Columbia, Canada Posts: 25 iTrader: 0 reviews	ttt __________________ Hurst Billet/Plus SST Short Throw Shifter, 1999 SVT Cobra Wheels, BBK O/R H-Pipe, Flowmaster American Thunder Catback Exhaust System, 5% Window Tint On Back 3 Windows, Eibach Pro-Kit Lowering Springs, Eibach 1" Wheel Spacers, BBK Cold Air Intake.

December 29th, 2011, 04:50 AM	#3
RedDevilGT SG 2005 Mustang GT 2001 Mustang V6 Join Date: Dec 2007 Location: Phoenix, AZ Posts: 4,136 iTrader: 0 reviews	Yes, make sure you get all dirt/debris off of the surface. Applying RTV around the gasket will not hurt anything at all. In fact, I did that the last time I changed my thermostat on my 01' and I haven't had any problems at all. __________________ 01' V6: SCT tuned, Dual Flowmasters & H-pipe, 8000k 35w HID's, Steeda Short Shifter, BBK CAI, Eibach pro-kit, 3.73's and t-lok. 05' GT: SCT tuned, C&L Racer, FRPP cams, Pypes Pype Bomb's, Shorty Antenna, Painted Mirror covers, Decklid Panel

December 29th, 2011, 05:22 AM	#4
Dan_T_Mustang Newbie 1995 Mustang GT Join Date: Apr 2011 Location: British Columbia, Canada Posts: 25 iTrader: 0 reviews	Also one side of the gasket is a stick on type so like a sticker, should I apply RTV on that side or no? __________________ Hurst Billet/Plus SST Short Throw Shifter, 1999 SVT Cobra Wheels, BBK O/R H-Pipe, Flowmaster American Thunder Catback Exhaust System, 5% Window Tint On Back 3 Windows, Eibach Pro-Kit Lowering Springs, Eibach 1" Wheel Spacers, BBK Cold Air Intake.

December 29th, 2011, 05:47 AM	#5
RedDevilGT SG 2005 Mustang GT 2001 Mustang V6 Join Date: Dec 2007 Location: Phoenix, AZ Posts: 4,136 iTrader: 0 reviews	No need to, what I did was put the gasket on the thermostat like normal and tightened the bolts, then I went around they faying edge with the RTV. __________________ 01' V6: SCT tuned, Dual Flowmasters & H-pipe, 8000k 35w HID's, Steeda Short Shifter, BBK CAI, Eibach pro-kit, 3.73's and t-lok. 05' GT: SCT tuned, C&L Racer, FRPP cams, Pypes Pype Bomb's, Shorty Antenna, Painted Mirror covers, Decklid Panel

December 29th, 2011, 02:37 PM	#6
furreal302 Regular 94 GT 13.95@100 Join Date: Jun 2011 Location: NY Posts: 435 iTrader: 2 reviews	I usually apply a thin layer, it helps keep the gasket in place while installing. If both surfaces are clean it will seal fine without. __________________ 94 Opal Frost GT ~230k T5 swap, other mods

December 29th, 2011, 06:22 PM	#7
Bubba95SN Regular 1995 Mustang GT Join Date: Feb 2011 Location: Jacksonville NC Posts: 211 iTrader: 0 reviews	Use brake clean on mating surfaces to remove oil coolant residue. Sanding housing on flat surface to remove imperfection and sanding with block on intake will help to seal. I use Fel Pro gasket. If using rtv, do so sparingly. No need for restriction from excess.

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

Threads Similar to: Question About Thermostat Housing Gasket
Thread	Thread Starter	Forum	Replies	Last Post
Crack going down thermostat housing	TheOdessa	99-04	27	July 9th, 2011 08:58 PM
Thermostat housing question '99 GT	sillyrabbit0420	99-04	12	April 28th, 2011 04:00 AM
stripped thermostat housing bolt :/	jonnydankness	5.0 Mustangs	6	February 20th, 2010 08:57 PM
HELP with thermostat housing	01 blue bullitt	99-04	9	December 13th, 2008 12:52 PM
Chrome Thermostat housing.	jrfan4life	99-04	9	April 17th, 2007 05:37 AM

All times are GMT -4. The time now is 07:47 AM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.