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10-19-2010, 08:36 PM
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CC Member
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Join Date: Sep 2009
Location: Camarillo,
CA
Cobra Make, Engine: SPF #2608, Roush 427SR T-W
Posts: 911
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Not Ranked
Thermostat Gaskets
I'm replacing my thermostat and the local auto parts store only had thin gaskets. The original gaskets were at least 5 times thicker. Will the thin ones work on my aluminum thermostat housing? Is there a recommendation on how much torque to put on the two bolts? Where could I find thicker gaskets? Sorry to ask such a trivial question, but what the heck! http://www.clubcobra.com/forums/images/smilies/erm.gif
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10-19-2010, 09:24 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,445
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Not Ranked
I don't use a gasket. I use a good silicone sealant instead.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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10-20-2010, 02:36 AM
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CC Member
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Join Date: May 2008
Location: San Jose CA,
CA
Cobra Make, Engine: SPF_R_/BRG/FRBoss302/327CI/FordEFI/Under_Car_Exh/
Posts: 2,523
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Not Ranked
I disagree, gaskets are mandatory. Your surfaces should be flat enough to only need the felpro standard. Set a straight edge across the surface as to determine if it is warped. Tourqe is 15-20 ft lbs max.
__________________
Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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10-20-2010, 09:52 AM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,445
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Not Ranked
Quote:
Originally Posted by PANAVIA
I disagree, gaskets are mandatory.
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Clearly not mandatory. On the Cobra, I'v been using Silicone only since the initial build. It has never failed. Althougnh I have changed the thermostat a couple of times in the last 5 years.
On my '66 Mustang, it held up for for about 15 years, until I sold the car. After the initial overhaul, I never removed the thermostat. The original silicone held up all those years.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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10-20-2010, 09:55 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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Not Ranked
Thinner/cheaper housings can warp under torque from the bolts and you will have a chronic leak. Make sure the surface is true and if not get a good THICK chrome aluminum housing from Mr Gasket for only about $15. I had a cheaper housing with a thinner flange and it always leaked due to warpage.
.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
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10-20-2010, 10:47 PM
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CC Member
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Join Date: Sep 2009
Location: Camarillo,
CA
Cobra Make, Engine: SPF #2608, Roush 427SR T-W
Posts: 911
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Not Ranked
I haven't quite mastered pictures yet, but this is supposed to be a picture of the thermostat housing. It is also in my first photo gallery if it doesn't come up here. The flanges are pretty thick. Does anyone use the round "O" ring type gasket with this? You can see the groove in the face.
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10-20-2010, 11:42 PM
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Regularly Offensive
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Join Date: Feb 2006
Location: yuba city,
ca
Cobra Make, Engine: spf
Posts: 1,231
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Not Ranked
Ward, Roush has your gasket in stock. Thick ones or thin ones; I am not sure which is best but I find it intresting the factory uses them.......
__________________
Ed
Too close for missles, switching to guns.........
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10-21-2010, 08:45 AM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,445
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Not Ranked
Quote:
Originally Posted by WardL
I haven't quite mastered pictures yet, but this is supposed to be a picture of the thermostat housing. It is also in my first photo gallery if it doesn't come up here. The flanges are pretty thick. Does anyone use the round "O" ring type gasket with this? You can see the groove in the face.
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This is what I use. I pitched the O ring a long time ago. Permatex red silicone only.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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10-21-2010, 09:01 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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Not Ranked
The Mr Gasket housing that I use has the exact same modified O ring. Never leaks.
.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
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10-21-2010, 09:35 AM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
I just went through it a while ago. Used the peel-n-stick FelPro's from NAPA and a light coating of Motorcraft Ultra Silicone #TA-29. No issues, no worries.
__________________
All that's stopping you now Son, is blind-raging fear.......
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10-21-2010, 09:37 AM
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CC Member
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Join Date: Aug 2006
Cobra Make, Engine: A&C
Posts: 379
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Not Ranked
Mine warped I couldn't seal no matter how thick the silcon or gasket was. I ran across it a belt sander. Sealed with just silcon now.
Ron
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10-21-2010, 10:42 AM
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CC Member
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Join Date: Mar 2001
Location: Cinnaminson,
NJ
Cobra Make, Engine: Cobra Fibercraft Bodies 427 S/C, 351W disguised as a 427.
Posts: 391
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Not Ranked
The trick I always use to check the housing flange is a piece of 400 grit wet/dry sandpaper on a pane of glass. Wet the paper and run the flange of the thermostat housing over the paper in a circular motion using even firm pressure. The high spots will show sanding marks while the low spots will remain chromed. Keep going until the entire surface is even. Silicone sealant on top of a gasket usually works well. Never had any issues using this method.
__________________
Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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10-23-2010, 09:12 PM
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CC Member
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Join Date: Jan 2003
Location: Laguna Hills,
CA
Cobra Make, Engine: Superformance SPO2820 408W; former ERA CCX 3-3408 owner
Posts: 299
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Not Ranked
What brand is that thermostat housing?
Ward: Who makes the thermostat housing in your picture?
-Tim
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02-02-2012, 12:50 PM
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CC Member
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Join Date: Feb 2011
Location: HB,
ca
Cobra Make, Engine: SPF roush 402
Posts: 66
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Not Ranked
^^^ I'd also like to know, I think it's from roush, I've called roush 4 times in the last 3 days......no reply.
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02-02-2012, 04:19 PM
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CC Member
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Join Date: Sep 2006
Location: Skjetten,
No
Cobra Make, Engine: Unfortunataly ; none
Posts: 333
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Not Ranked
How hard i tried, the gasket would not seal- even if it's a OEM Ford thermostat housing, so silicone was the way to go. It seals.
Wonder if silicone on the intake side, then a gasket & bolting the housing on to let dry would make it possible to remove the housing later, for instance to test another thermostat, and then refit without changing gasket or apply fresh silicone would work?
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02-02-2012, 04:46 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
I have the same engine and housing you do.
When I replaced the thermostat, I used a standard Felpro thermostat gasket with some silicone sealer to hold it in place during installation. No problems in 10,000 miles.
__________________
Jim
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02-02-2012, 09:36 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
What may be happening is the thermostat is sliding/falling out of the machined relief and the outer edge of the thermostat is being sandwiched between the manifold and Thermostat housing. No reason it should not seal.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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