SBC t-stat housing--o-ring or gasket? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-14-2014, 04:18 PM
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SBC t-stat housing--o-ring or gasket?

Only found 1 t-stat housing to fit under tri-power. The housing requires an O-ring, the intake manifold has no groove for it, and needs flat gasket. Upon first attempt, I used a gasket and sealer, but leaks. Ready to try again...wondering if I should double up on the flat gasket, or try O-ring and flatten it down???

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Old 07-14-2014, 04:37 PM
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You state the housing requires an o-ring. If this is the case then the housing will have an o-ring groove machined into its face.
  • Use an o-ring if it has the groove.
  • If it does not have a groove do not use an o-ring.
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Old 07-14-2014, 04:57 PM
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Don't use sealant, use silicone grease. O-rings are dynamic seals and need to move to work.

Unless its a compression type o-ring that gets crushed completely, then use a non-hardening type sealant not silicone. Silicone doesn't work well on those chrome style o-ring thermostat housings.
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Old 07-14-2014, 05:29 PM
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If it is truly a housing designed for an o-ring (again, it should have a groove in it) you won't need any sealant.. just the o-ring.

How an O-ring Functions

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Old 07-14-2014, 05:50 PM
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OK...the housing def has the groove. But I thought the intake had to have the same groove for it to work properly? Looks like the O-ring will just surround the t-stat? Does the O-ring just get mashed down onto the flat surface of the intake?
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Old 07-14-2014, 05:53 PM
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Quote:
Originally Posted by 31ROC View Post
OK...the housing def has the groove. But I thought the intake had to have the same groove for it to work properly? Looks like the O-ring will just surround the t-stat? Does the O-ring just get mashed down onto the flat surface of the intake?
Yes. A typical o-ring sealing joint design has one flat surface and one grooved surface, like you see in the link I provided above.

The correct o-ring when placed into the groove will be slightly bigger in diameter than what the depth of the groove is.
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Old 07-14-2014, 05:55 PM
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Yes. A typical o-ring sealing joint design has one flat surface and one grooved surface, like you see in the link I provided above.

The correct o-ring when placed into the groove will be slightly bigger in diameter than what the depth of the groove is.
LOL...so I learn something new everyday. Guess that's why it leaked. I went with a flat gasket and sealant, no O-ring.....what a DUH!!!
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Old 07-14-2014, 06:08 PM
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here's the housing, and intake (w/t-stat still in).....
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Old 07-14-2014, 06:20 PM
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Clean all the sealant out of the housing and clean off the intake, try not to scratch either surface. Re-assemble with an o-ring and no sealant and you should be good to go!
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Old 07-14-2014, 06:22 PM
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OK...will do. Just read another forum, they installed this WITH the O-ring also....
http://www.summitracing.com/parts/FEL-35562T/
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Old 07-14-2014, 06:31 PM
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Yeah, I believe that is designed for a housing without an o-ring groove.

The o-ring has to be able to move to seal, in the case of the housing type you are using, on its O.D. and on its top and bottom. The pressure in the radiator squishes it against the surfaces, again, as described and shown in the details in the link above.

Make sure you use the size and material of o-ring that the t-stat housing manufacturer specifies.
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