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?Gasket Sealant for Radiator

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Ken Reese

12-20-2000 06:33:13




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I've had several posts & responses regarding sealing heli-coil threads - now I'm moving on to the radiator.

What material/sealant will provide the best seal between the radiator top & bottom tanks-gaskets-and radiator core?

UltraBlue silicone, Permatex#3, Spray Tack Gasket Sealant????? RECOMMENDATIONS WILL BE APPRECIATED.

Thanks,
Ken Reese
E-mail: [email protected]




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Idaho Curt

12-22-2000 11:54:55




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 Re: ?Gasket Sealant for Radiator in reply to Ken Reese, 12-20-2000 06:33:13  
I just finished my 1944 B radiator. I first sand blasted the pitted gasket surfaces and then filled the pits with JB Weld. Once it was dry I used a flat file to knock down the high sports and make it flush with the rest of the gasket surface. Used some spray adhesive from NAPA on the JD gaskets and then bolted the whole thing together.

Curt



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Patrick

12-21-2000 17:40:56




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 Re: ?Gasket Sealant for Radiator in reply to Ken Reese, 12-20-2000 06:33:13  
I have found that using cork gasket that you can buy at most parts stores cures the rust pit problem. Build a gasket for the top and bottom tanks out of the cork, use a lite coat of gasket maker on both sides to hold them in place and bolt it all together and forget about it. It works great. The cork takes care of any misalignment from the rusted tanks. Good luck, hope this helps.



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Gman

12-20-2000 17:23:16




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 Re: ?Gasket Sealant for Radiator in reply to Ken Reese, 12-20-2000 06:33:13  
Ken my experience with these old radiators is that the tank surfaces are usually pitted pretty bad,I take an oil stone and hone them but you can't get the deep pitts out so I use the silicone sealts to more or less fill the pitts,but I never did soak the gaskets,and they always leaked till they get warmed up then they seal off,the first radator I did it leaked like a sive,boy was I blue but it sealed off,getting windy seeya Gman

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Charles

12-20-2000 10:43:29




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 Re: ?Gasket Sealant for Radiator in reply to Ken Reese, 12-20-2000 06:33:13  
Just a word of warning - use the stock gaskets... I tried using Permatex #2 instead of the gaskets because I didn't have new ones handy. It leaked. Everywhere. I cleaned it all off and put the gaskets in with just a touch of Permatex and it's been working fine for two years.
RTV silicone also has a bad habit of coming off in little balls/strips that get stuck in important passages and can't be dissolved out.

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clooney

12-20-2000 10:52:40




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 Re: Re: ?Gasket Sealant for Radiator in reply to Charles, 12-20-2000 10:43:29  
Charles, thats a good point on silicone & radiator & other passages, thank you for bringing that up.



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clooney

12-20-2000 07:27:46




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 Re: ?Gasket Sealant for Radiator in reply to Ken Reese, 12-20-2000 06:33:13  
Ken, I agree with Mike & don't ever use any type of silicone as a gasket reinforcement, if it starts leaking at a later time (& it probably will) there is no way to stop if. My personal choice is a product by loc-tite called "515 gasket eliminator" it is great for filling is all those little pits & makes a great gasket reinforcement & can even be used without a gasket as long as the gap isn't bigger than .010"-.015". It isn't the easiest thing to remove later so I don't use it on anything that has to be removed later. The cost is fairly high to begin with but I have never had a leak appear later if the surface was clean & somewhat flat to begin with. I use it for flanges, radiator tanks, bearing covers & in a lot of the cases that I don't want to use a gasket because of bearing wear or the need to tighten the clamp load on a bearing or part. The auto industry uses loc-tite 515 or a version of it for a lot of places that must remain leak free & are exposed to alcohol or synthetic oils. It is an anaerobic & only hardens with the lack of air so it remains soft except where the parts actually come close or touch each other. For areas that may have to come apart or must remain somewhat soft such as the edges of head gaskets, or areas that will have to be adjusted later I use #3 permatex as it comes apart easily & can be tightened later if it starts to seep or leak.

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Mike Aylward

12-20-2000 06:42:49




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 Re: ?Gasket Sealant for Radiator in reply to Ken Reese, 12-20-2000 06:33:13  
Ken, on these gaskets, if they will lay down where they belong, I just use ordinary gun grease to soften them a little. If they are old gaskets and don't want to lay down or fit the holes, I will sometimes soak them in gasoline (yes, gasoline) and get them to expand and soften enough to lay down, then put the gun grease on them and bolt it together. I am not a fan of silicone on these as it goes everywhere and is hard to get out of some places. The gun grease will keep the gasket soft to insure a good seal. The #3 Permatex would be my second choice, if the gasket was new and "lively". An "old" farmer's trick. Hope this helps. Mike

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