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By oldcarmark - 7 Years Ago
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I have replaced the Gasket twice. The Stat Housing is newer with no Corrosion. It is flat. The Intake Manifold Outlet is flat. I have always used a Gasket and Gasket Maker (Permatex etc) together. Never had a problem. Doing some reading it is not recommended to use a Gasket and Gasket Maker together. Just use a Gasket Adhesive. I cut my Gaskets from a Sheet about 1/8 inch thick. I have one thin Paper One left from a Gasket Set. I would have thought the thicker Material would be better to use? Any Tips anyone wants to offer that You find works?
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By Hoosier Hurricane - 7 Years Ago
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Are you sure it is the gasket leaking? Those pressed-in tubes for the bypass hose have a history of rusting away right at the casting.
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By miker - 7 Years Ago
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The guys who build a lot of engines will know better than me, but I’ve been using this on paper and cork since Dad taught me to use it way more than 60 years ago.
https://www.permatex.com/products/gasketing/gasket-sealants/permatex-form-a-gasket-no-2-sealant/
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By oldcarmark - 7 Years Ago
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Hoosier Hurricane (5/26/2018)
Are you sure it is the gasket leaking? Those pressed-in tubes for the bypass hose have a history of rusting away right at the casting.
Its leaking between housing and Manifold. The Housing is newer. Bypass tube is good.
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By charliemccraney - 7 Years Ago
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Sometimes the bolts just need to be tightened after a few heat cycles.
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By PF Arcand - 7 Years Ago
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Mark: also put some sealer on the bolt threads, might help..
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By 62bigwindow - 7 Years Ago
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I had the same problem with the paper gaskets. I changed mine 3 times and it would weep coolant every time. I even put sealant on both surfaces with no luck. I finally got a Fel-Pro gasket and it never happened again.
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By Gene Purser - 7 Years Ago
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I had a water pump that a gasket wouldn't seal. I used Permatex Water Pump and Thermostat gasket maker and it stopped it. You put a bead around the sealing surface, thighten until it begins to squeeze out, wait 30 minutes, and torque
https://www.permatex.com/products/gasketing/gasket-makers/permatex-water-pump-thermostat-rtv-silicone-gasket/
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By Ted - 7 Years Ago
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I have used a thin film of ‘black’ RTV on both sides of the thermostat gaskets that just don’t stop weeping under normal circumstances.
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By tbirdhs - 7 Years Ago
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My housing was just leaking last month. Last time it was apart 13 years ago both pieces showed corrosion. Before disassembling it ordered a reproduction housing with by pass tube installed, and a replacement tube to install into my old housing as an option.. I decided to install new reproduction thermostat housing. Its been thru several heat-ups and no problems. I have never use form a gasket or any other silicon type sealer. I always use a LIGHT coat of gasket shellac/sealer on all surfaces and take a paper towel to remove any excess. Let dry for 10 minutes and assemble. Always works for me.
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By oldcarmark - 7 Years Ago
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Thanks for the Suggestions. I got it fixed. Used a flat file to lightly knock off any high Spots on the Intake Outlet. Paper Gasket and Permatex Aircraft liquid Sealant on Housing and Intake outlet. Don't see any Leaks now. I will snug up the Bolts again in a Couple of Days. Doesn't take much of a High Spot to cause it to Leak.
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By paul2748 - 7 Years Ago
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I use RTV with no problems. A thin coat on both sides of the gasket
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By DryLakesRacer - 7 Years Ago
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I don"t know what you guys are call in "paper" but I've made many including different thicknesses of purchased specific gasket material for water areas using Permatex#2 and never had any problems. Some "paper" is porous and should not be used in water applications. I'm pretty anal on stuff like this and I make the material is for water/pressure applications. Good luck.
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By Cliff - 7 Years Ago
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Never use silicone with a gasket (corners are OK), silicone should be used in place of a gasket, silicone used with a gasket creates silicone worms that can end up in the oil pump or other places, I had a Mazda that had a valve train noise (lifters would not pump up), ended up pulling the head (my friend not me), it had a silicone worm in the oil galley and blocked it off, lesson learned.
Cliff
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By oldcarmark - 7 Years Ago
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DryLakesRacer (5/28/2018)
I don"t know what you guys are call in "paper" but I've made many including different thicknesses of purchased specific gasket material for water areas using Permatex#2 and never had any problems. Some "paper" is porous and should not be used in water applications. I'm pretty anal on stuff like this and I make the material is for water/pressure applications. Good luck.
I have several Sheets of proper Gasket Paper that I cut my own Gaskets from if I don't have One on Hand.
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By Rono - 7 Years Ago
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Whenever I get a leak around the thermostat housing I make sure the sealing surface on the housing is flat by using a flat steel plate and some 220 grit emery paper and rub the housing back and forth until it is flat and true.
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By oldcarmark - 7 Years Ago
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That's a good suggestion. Just make sure the recess for the Stat is still sufficient for the Stat to sit below the flat Surface. Sometimes the Housings are just too far gone to still be usable.
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By Talkwrench - 7 Years Ago
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Just double check its not coming from the hose.. That caught me out , Ive never normally had a problem and it was simply the hose leaking underneath where I couldn't see it running down. File both sides flat , clean and use a black gasket paper .060 thick and some non hardening on both sides and around the threads, don't go overboard with tightening. Bob's your auntie!
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