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Coolant leak
#1
Hey gang, looks like I've got a leak coming from the thermostat housing where it joins the block (351 Cleve). I've got coolant pooling around the MSD distributor. I used an O ring instead of a gasket when I changed the thermostat. I'm going to go try and source out the proper gasket but any suggestions on using silicone or some other type of sealant goop?
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#2
i've always used Permatex high-Temp Red RTV Silicone Gasket........

http://www.permatex.com/documents/Gasket...lector.pdf

73 ragtop, 1999 Mustang Bright Atlantic Blue Paint, Phoenix Engine 302-335HP,  Edelbrock Carb & Performer manifold; c4 with 2000 stall and shiftkit; 3:55 auburn limited slip differential, Hedman shorties; Car Chemistry Exhaust

Classic Air; Tilt Steering Wheel; 1999 Chrysler Sebring bucket Seats ; power windows;
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#3
I have had good luck with Fel-pro paper gaskets.
Make sure thermostat housing is not warped, you can lay a sheet of sandpaper on a flat surface and sand it down a bit.

[Image: mustangnight010.jpg]
1972 Mustang Convertible 351C 4V
1966 Ford Galaxie 7 litre-4speed

Jorge
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#4
x2 with mudbilly
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#5
(12-23-2010, 02:03 PM)jorgem2 Wrote: I have had good luck with Fel-pro paper gaskets.
Make sure thermostat housing is not warped, you can lay a sheet of sandpaper on a flat surface and sand it down a bit.


X2 good gaskets and flat surfaces are key. I've had good results with Permatex black adhesive silicone also 3M super weather strip adhesive for stubborn places.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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#6
Thanks guys, I'm not going to tackle this till the spring but I want to get the stuff I need. Thx for the advice.
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#7
"Right Stuff" is very expensive but is second to none in my opinion. Comes with 2 tubes and a gun (like a caulk gun, which makes applying easy and accurate) Everything i have ever sealed with it has stayed leak free and ive been using it since 03 when a guy i worked with introduced it to me. Its like 36.00 for the set here last time i checked but you can do many many projects with the kit. Ive seen it at most auto parts stores. Like said above TWO perfectly clean surfaces is key. I also always use brake clean to remove all grease and other crap since it leaves no residue but be careful because I have heard it can eat paint.

Good luck!!!

Cody--
72 Mach-1 12:1 532 Forged internal Scat stroker, Kaase P51 heads, Comp roller cam, March serpentine conversion, C6 manual VB, 9'' 4:33:1.
66 convertible 289, 82k miles.
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#8
i ground the housing down until it was perfectly flat and then used silicone and the paper seal. no leaks till now
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#9
A belt sander can do wonders for something like that.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
  Reply
#10
(12-28-2010, 09:43 AM)canadian_red_maple_leaf Wrote: i ground the housing down until it was perfectly flat and then used silicone and the paper seal. no leaks till now

I also used both the high temp. silicone and the paper gasket and havent had a leak.

71 Mustang fastback
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