Thermostat housing question - Team Camaro Tech
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post #1 of 13 (permalink) Old Apr 17th, 15, 06:36 PM Thread Starter
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Ben
 
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Thermostat housing question

Ok I recently replaced a gasket on my thermostat housing, well it started leaking again. So I've read that the housing could be warped. So I bought a new one with the o-ring. Do I use the RTV with the o-ring or not? I thought about buying that $12 plastic reusable gasket. What are your suggestions?
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post #2 of 13 (permalink) Old Apr 17th, 15, 07:01 PM
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Big Dave
 
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Re: Thermostat housing question

I dont use RTV on the o-ring.

Just dry or maybe a dab of grease if the gasket easily falls out of the housing.

i love the o-ring style...works great for me anyway!

'69 camaro, was orig SS 396 car.
original tranny & 12 bolt

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post #3 of 13 (permalink) Old Apr 17th, 15, 07:20 PM
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mike
 
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Re: Thermostat housing question

These new GM water necks are decent for the money.
http://www.jegs.com/i/Chevrolet-Perf...oductId=762707

1967 convertible T-1
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post #4 of 13 (permalink) Old Apr 17th, 15, 07:33 PM Thread Starter
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Ben
 
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Re: Thermostat housing question

Thanks big Dave. I wasn't sure because I know that some people complain about leaking by the bolts. Mike I like that new aluminum housing, but I wonder if the intake I have would work with that because it has a groove in it, that looks like its suppose to use the o-ring. I've done this before on another car and I used a gasket with RTV but I don't remember seeing the groove.
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post #5 of 13 (permalink) Old Apr 17th, 15, 08:08 PM
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Morgan
 
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Re: Thermostat housing question

Whatever neck you use other than an o ring deal, sand it flat on a piece of glass and do the same on the intake with a block. You are not trying to sand it down, only insure it is flat. Throw any gasket you have in the garbage, use the permatex for thermostats housings, small tube for $3.00. Put a thin complete coat on both parts, assemble and hand tighten until you just see it start to squeeze out, stop and come back in one hour and snug it up. Never touch it again. The gaskets actually leak through themselves. This system has never failed yet.this permatex works.

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post #6 of 13 (permalink) Old Apr 17th, 15, 08:30 PM Thread Starter
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Ben
 
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Re: Thermostat housing question

Thanks Morgan I prob shouldn't have used the gasket with the permatex last time. Yeah I realize that you need a flat surface. I cleaned both the intake and the housing very well last time. Last dumb question, if using the o-ring only way, should I put anything on the bolts or no?
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post #7 of 13 (permalink) Old Apr 17th, 15, 08:56 PM
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Doug
 
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Re: Thermostat housing question

Smear a little Permatex on the threads since they go into a water jacket.
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post #8 of 13 (permalink) Old Apr 17th, 15, 08:58 PM Thread Starter
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Ben
 
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Re: Thermostat housing question

Ok great that's kinda what I thought thanks!
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post #9 of 13 (permalink) Old Apr 18th, 15, 06:37 AM
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Re: Thermostat housing question

Subscribing! I have a slow weep that I cannot seem to beat. I will try this method now!

Quote:
Whatever neck you use other than an o ring deal, sand it flat on a piece of glass and do the same on the intake with a block. You are not trying to sand it down, only insure it is flat. Throw any gasket you have in the garbage, use the permatex for thermostats housings, small tube for $3.00. Put a thin complete coat on both parts, assemble and hand tighten until you just see it start to squeeze out, stop and come back in one hour and snug it up. Never touch it again. The gaskets actually leak through themselves. This system has never failed yet.this permatex works.

Kevin


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post #10 of 13 (permalink) Old Apr 18th, 15, 06:56 AM
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Ty
 
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Re: Thermostat housing question

The self sealing gaskets are great and reusable.
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post #11 of 13 (permalink) Old Apr 18th, 15, 02:45 PM
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Steps
 
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Re: Thermostat housing question

This has been an issue for decades
Grab an old stock housing and gasket.. torque down even good to go for another 80K miles
Aftermarket...even before cheap chinese, maybe it was cheap jap stuff back in those days.. seep, leak and short life because tended to corroded holes in the roof ...where any air may collect over night.. basically a disposable item.. re use on and they would leak seep whatever.
A big part of the issue on these and also quailty units is user, regardless of what gasket/ sealant used
They have 2 hold down bolts.. not 3....if they are not bolted down evenly and toqued at the correct spec.. Ie over torqued they distort easy and leak.
The O ring ones where are far more forgiving...and re use well several times with a thin layer of silcone gaskets rubbed.. not just laid.. into both surfaces inside the O ring.. then Torqued.

look very close at the 'chrome' surface of a used (usually over torqued) unit, notice the stress hair line cracks in the surface.

But generally unless very well treated.. correct torques etc.. a disposable item.
2 bolts not 3, maybe not the best of engineering designs to be tolerant of mis use.

My Spelling is not incorrect...it is creative

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post #12 of 13 (permalink) Old Apr 18th, 15, 04:12 PM
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Re: Thermostat housing question

The "re-useable" gaskets are garbage...put one on my new build, leaking this spring at start up...got myself a good ole felpro gasket, sealed both sides with black RTV...no more leaking...

Should've just done that in the beginning-it it what I had done for years, with never a problem.. tried the re-useable as a "short-cut"...doubled the work!

Keith
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post #13 of 13 (permalink) Old Apr 19th, 15, 06:58 AM
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Mark
 
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Re: Thermostat housing question

I use The Right Stuff with no gasket for both my stat housing and water pump with no leaks and it's ready to run within 10 min.
If you have an aluminum housing then this stuff will fill them in. It's like liquid rubber. Don't waste your time with gaskets cause
they will eventually leak especially if no sealant is used.


Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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