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Thermostat Gasket question 

 

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 Post subject: Thermostat Gasket question
Posted: Sat Jul 04, 2009 10:12 am 
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i replaced my thermostat in my EF 6cyl couple months ago, and fitted it along with a gasket for the housing. Now it leaks.

so i went to Fraud and asked them for a better gasket, and they told me you dont use a gasket around the housing where it bolts together, as the thermostat already has a rubber seal and me using the surrounding gasket is why its leaking.

i asked them why the f**k does repco sell the housing gasket and they shrugged their shoulders.

....ssooo do i just use the thermostat with the rubber seal on its own, or do i also use the paper gasket the sits between the two pieces that surround the thermostat?
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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 11:10 am 
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i use some gasket goo on mine
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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 11:23 am 
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I would use the gasket, and some gasket cement, let it dry over night and you should have no problems....

 

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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 11:26 am 
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i did.... i used the thermostat with the rubber seal, and a surrounding paper gasket coated in permatite blue silicon.

now it is leaking in two spots. I went and purchased another thermostat but i dont want to do it wrong again when i fit it.
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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 11:37 am 
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hmm weird, i thought it would of been fine, are both surfaces clean on housing and head? thats another thing that has caught me out before

 

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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 11:41 am 
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the leak isnt from where the housing bolts to the head, but where the two sections of the housing bolt together around the thermostat

you would think ford would know if a gasket is needed there or not, but common sense says you need a gasket there so i dunno what to do......
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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 12:35 pm 
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I've also had problems with aftermarket thermostat gaskets leaking. I think they're made in China, so there's a problem to start with. They seem to disintergrate after a while.

The best stuff to use is brown gasket paper you buy from Repco, etc. Make your own gasket and use silicon sealant as well. Also keep the rubber gasket around the thermostat. I've tried the gasket making silicon but that didn't work well (for me).

 

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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 3:16 pm 
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ive only ever used the rubber ring that goes around the thermostat and if i re use it i spread a little gasket silicon around the surfaces..

maybe the water neck is warped?
try another neck and see what happens...
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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 5:45 pm 
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When fitting a new rubber t'stat seal, file flat the water neck and the housing. If been mucked around with before, people tend to over do the bolts and warp the housings.
You do NOT need to use any sealant of any kind. Rubber seals best on clean, dry, flat surfaces.
Don't forget to put an 1/8" hole in the t'stat....this helps stop heat shock at the radiator.

 

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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 6:11 pm 
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I only use the rubber seal for the thermostat and then just smear a little bit of the blue gasket stuff, seems to work well havent had a leak ever since i replaced the thermostat last year. Just make sure that both mating surfaces are clean etc..

To be honest i never even knew that there was supposed to be a gasket between the upper and lower thermostat housings lol. Even the full VRS gasket kit i bought when i did the head gasket didnt even include one, only the one for betwen the lower housing and head and the rubber seal around the thermostat were in the kit

 

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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 7:01 pm 
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hmm, so some use the paper gasket/silicone and some dont.

i might try using a paper one again with plenty sealant..... im guessing the surface is warped as i did this last time and hasnt worked

thanks for the opinions
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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 8:20 pm 
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Don't use a gasket!

As above the rubber ring around the thermostat is all you need.

Think about it, a 40tho (approx) paper gasket STOPS the rubber gasket from squashing, and...... can leak.

Your best off cleaning both surfaces with 200+ grit and a flat surface to give it a lapped surface.

 

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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 9:00 pm 
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use the gasket and a silcon sealer. just get a file and face it off. the housings warp with heat and the way the bolts are in them. :wink:

 

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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 9:05 pm 
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arrgh.... differing opinions

i spent $30 on this thermostat so i wanna only do it once and have it seal properly. Ok so i will try it without the gasket and rely on the rubber seal from the thermostat...... if it leaks, then i blame Krytox :P
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 Post subject: Re: Thermostat Gasket question
Posted: Sat Jul 04, 2009 9:12 pm 
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I used the rubber ring around the thermostat and some high temp gasket sealer from Sprint Autoparts less than $10 if i remember ! Thats all and no leaks !

 

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