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Coolant leak
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madmach



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    Post: #1
    Coolant leak

    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?
    Offline 12-23-2010 11:40 AM
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    mudbilly



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      Post: #2
      RE: Coolant leak

      i've always used Permatex high-Temp Red RTV Silicone Gasket........

      http://www.permatex.com/documents/Gasket...lector.pdf
      Offline 12-23-2010 12:40 PM
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      jorgem2



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        Post: #3
        RE: Coolant leak

        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.
        Offline 12-23-2010 02:03 PM
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        Tnfastbk



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        Car of the Month Trophy Shooter

          Post: #4
          RE: Coolant leak

          x2 with mudbilly
          Offline 12-23-2010 04:58 PM
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          droptop73


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            Post: #5
            RE: Coolant leak

            (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.
            Offline 12-23-2010 07:46 PM
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            madmach



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              Post: #6
              RE: Coolant leak

              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.
              Offline 12-23-2010 11:14 PM
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              mach1460



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                Post: #7
                RE: Coolant leak

                "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!!!
                Offline 12-24-2010 05:54 PM
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                canadian_red_maple_leaf



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                  Post: #8
                  RE: Coolant leak

                  i ground the housing down until it was perfectly flat and then used silicone and the paper seal. no leaks till now
                  Offline 12-28-2010 09:43 AM
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                  droptop73


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                    Post: #9
                    RE: Coolant leak

                    A belt sander can do wonders for something like that.
                    Offline 12-28-2010 01:21 PM
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                    71fastback



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                      Post: #10
                      RE: Coolant leak

                      (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.
                      Offline 12-28-2010 08:03 PM
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