Thermostat Gasket
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Joined: Aug 2007
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Thermostat Gasket
I just got done with an all weekend intake manifold/thermostat housing removal and replacement and now consider myself some what of a manifold/thermostat specialist
. And thought I'd pass on some information I learned about these new style thermostat gaskets that are self adhesive on one side. The first time I put the thermostat back in I removed the protective paper from the adhesive, put a layer of RTV on both side of the gasket, bolted in and it began leaking immediately once the radiator was filled back up even before starting the engine. So, went back to the store and bought two more gaskets and this time removed the protective backing from the adhesive side and put RTV ONLY on the non-adhesive side of the gasket and let the sticky side of the gasket do its job. Bolted everything back together, started up with no leaks. Moral of the story, don't use any chemical adhesive on the adhesive side of the gasket. I know this may sound like a petty issue but I wish I would have known this before dumping another gallon of Prestone all over the drive way.
. And thought I'd pass on some information I learned about these new style thermostat gaskets that are self adhesive on one side. The first time I put the thermostat back in I removed the protective paper from the adhesive, put a layer of RTV on both side of the gasket, bolted in and it began leaking immediately once the radiator was filled back up even before starting the engine. So, went back to the store and bought two more gaskets and this time removed the protective backing from the adhesive side and put RTV ONLY on the non-adhesive side of the gasket and let the sticky side of the gasket do its job. Bolted everything back together, started up with no leaks. Moral of the story, don't use any chemical adhesive on the adhesive side of the gasket. I know this may sound like a petty issue but I wish I would have known this before dumping another gallon of Prestone all over the drive way.
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
u dont say on what, but they are evil cuz they are on the side and the thermostat can slide down and go between the housing and the head(I6) or intake (v8).
I used little dabs of rtv to hold the thermo in place. its still maddening.
I used little dabs of rtv to hold the thermo in place. its still maddening.
Posting Guru
Joined: Jan 2001
Posts: 2,358
Likes: 3
From: Nebraska
5.0's use that same adhesive style gasket. I did the same thing...RTV on both sides. It didn't leak immediately, but I did notice it start seeping within a couple months. Then later on, mine actually blew out spewing antifreeze all over.
I blame two things: the RTV and it's a cheap gasket. I think the RTV weakened the entire gasket. Ford gaskets are thicker and I don't think they have adhesive. I put another cheap one on for the time being as I couldn't get to Ford at the time, but it's definately on my to-do list.
I used Ford timing cover gaskets this spring on my truck and it's amazing how much more sturdy they look and feel. No more parts store gaskets of any kind for me, ever!
I blame two things: the RTV and it's a cheap gasket. I think the RTV weakened the entire gasket. Ford gaskets are thicker and I don't think they have adhesive. I put another cheap one on for the time being as I couldn't get to Ford at the time, but it's definately on my to-do list.
I used Ford timing cover gaskets this spring on my truck and it's amazing how much more sturdy they look and feel. No more parts store gaskets of any kind for me, ever!
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WilleyJoe.62
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Mar 4, 2014 07:44 PM
