QUICKIE: Gasket or seal or BOTH during thermostat replacement?

[mhuffman]

[RESOLVED]

The rubbed gasket around the thermostat is not used on 1g's. I used a paper felpro water neck gasket with a thin layer of black silicone permatex hi-temp RTV on both sides of the gasket. No leaks.

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Specifically for a 1g NT.

My thermostat is stuck open and is over-cooling. The thermostat i am getting does not have a rubber seal around the outside of it.

What gaskets and seals were used as OEM? I've seen flat paper gaskets that seal the water neck to the thermostat housing, and i've seen rubber seals that fit around the perimeter of the thermostat.

DO I NEED BOTH THE FLAT PAPER GASKET AND THE RUBBER SEAL?

 

[WES_393]

You just need the gasket. Silicone sealant will also work.

http://vfaq.com/mods/wayback/BradBauer/engine/thermo.html

 

[bmxmk18]

The paper gasket is like $1.50 at advance, probably cheaper then a $5.00 tube of rtv.

 

[WES_393]

Unless you already own a tube of RTV, but not a paper gasket.

 

[mchustle]

I agree with Wes my tool box always has a tube or 2 of rtv . So naturally I always use rtv for mine.

 

[Jon91TSi]

I always use a gasket, Felpro, It comes with a ring of silicone, and I coat every gasket with this stuff..

http://www.itwconsumer.com/versachem-products/product.cfm?id=Sure Tack Gasket Sealant-93

When used on paper, or paper type gaskets I have found that they will not blow out. I have run this stuff on Felpro intake manifold gaskets to over 40 psi without a failure. It's hard to find, and I believe that's why not many people know about it.

Jon

 

[COdsm]

+1 for RTV. Can get it at any local hardware store.

 

[lasthope05]

I always use a gasket, Felpro, It comes with a ring of silicone, and I coat every gasket with this stuff..

http://www.itwconsumer.com/versachem-products/product.cfm?id=Sure Tack Gasket Sealant-93

When used on paper, or paper type gaskets I have found that they will not blow out. I have run this stuff on Felpro intake manifold gaskets to over 40 psi without a failure. It's hard to find, and I believe that's why not many people know about it.

Jon

Permatex high tack is pretty much the same thing available at any parts store in bottle form or aerosol. Its good stuff so you're not fighting against a gasket that keeps falling off or doesn't stay in place as your installing it.

 

[mhuffman]

I bought the felpro gasket and torqued the water neck to spec and it leaked within a few minutes of start-up!! I was careful to clean both mating surfaces, but things still went sour.

So i let the engine cool, took it apart, dried it off, and applied a very thin layer or permatex hi-temp black RTV to both sides of the gasket and let it cure for two hours with a shop light providing a little heat. Voila, no more leak.