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Old 04-05-2006, 08:07 AM   #1 (permalink)
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Can't get thermostat housing to stop leaking

I have tried 3 different types of gaskets on my housing. And the booger won't quit leaking on the low side. I checked to make sure the metal on the housing was true and straight, as for the block.

What my question is, should I use gasket adhesive? Silicone. I am kind of hesitant to have anything that may break apart and get into my cooling system. My friend says he uses it all the time.
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Old 04-05-2006, 08:10 AM   #2 (permalink)
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we use the permatex in a can at my shop, seems to work fine for us.
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Old 04-05-2006, 10:11 AM   #3 (permalink)
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While you are worried about something that may break apart and enter your cooling system, use silicone with good judgement (a thin bead). It's always better than a leaking cooling system.
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Old 04-05-2006, 10:21 AM   #4 (permalink)
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Use hylomar
http://www.valco-cp.com/Hylomar.htm

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Old 04-05-2006, 11:05 AM   #5 (permalink)
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use double gaskets.
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Old 04-05-2006, 11:09 AM   #6 (permalink)
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Is it one of those crome POS's? If it is, throw it away and use the stock one.
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Old 04-05-2006, 11:33 AM   #7 (permalink)
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you sure you scraped all the old gasket off?
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Old 04-05-2006, 12:16 PM   #8 (permalink)
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If you want it to really quit leaking.. use 3M Weatherstripping Glue, yes, the yellow snot looking stuff.. it wont leak anymore..
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Old 04-05-2006, 08:15 PM   #9 (permalink)
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Before you go fooling with sealant and stacking gaskets... check the simple stuff first. One - Thread the bolts in and make sure they aren't bottoming out before they get tight and clamp the housing. If so, get shorter bolts or stack some washers on top of them so it will generate clamping force. Two -is the housing cracked or chipped? maybee it has a small crack that only allows seepage under pressure, or when the engine is cool & then stops once it's warmed up. Three - are you using the proper gaskets & water neck? Four - are you sure it's the water neck that's leaking, not the upper hose, or the intake manifold itself? Five - Are you tightening the bolts reasonably tight? They don't need to be He-Manned on there, but they can't be finger tight either. Six - Is it an o-ring style water neck? If so, it's designed to work without a gasket with just an o-ring in the groove on the bottom of it. (chances are it still wouldn't leak even if it was installed with a gasket & no o-ring, but you might as well check). If there is an o-ring in there make sure it's the correct one.

Always rule out the simple stuff by imspecting the situation thoroughly before you go spending money and wasting time swapping parts unnecessarily. The thermostat housing is honestly not a very high tech piece of equipment. Clearly something is wrong if it's giving you this much trouble.

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Old 04-05-2006, 09:30 PM   #10 (permalink)
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One other thing, are you using a factory style thermostat housing or an aftermarket chrome one? Some of the cheap chrome ones have sealing problems. If this is what you have you need to shitcan it and get one that isn't plated on the gasket surface.
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Old 04-07-2006, 05:45 AM   #11 (permalink)
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Use some Permatex Ultra Blue-weatherstrip adhesive softens up and makes a big mess. Why not buy something made for this like Ultra Blue instead of yellow snot?
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Old 04-07-2006, 11:16 AM   #12 (permalink)
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also check the thermal vacuum switch if your housing has one. Mine was seaping a little biit when i replaced itm and it looked like the housing was leaking. 1/4 turn of the thermo vacuum switch was all it needed.
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Old 04-07-2006, 04:03 PM   #13 (permalink)
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It ain't flat. Get a piece of 80-grit sand paper, lay it on a flat surface, and sand that bitch 'till it's flat.

Then, don't use a gasket; use a good silly cone sealant only. A gasket has so much squish to it that it can cause the housing to warp all over again.
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Old 04-10-2006, 01:59 PM   #14 (permalink)
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Unfortunately I have to use a chrome aftermarket. Since it was a boat motor, I had to convert the pulley system. And the brackets now make it impossible to get the stock 45degree to hook up to any hose. So I had to go with a chrome 90degree one.

It's also not the hoses, I watched, it's easy to tell since they are all new, you can easily tell if it's leaking at the hose. Bolts are not too deep I actually threaded them without the housing to make sure.

I checked the housing, it's setup for a standard gasket. I also checked to make sure it's true and straight (enough). I also made sure the manifold was clean and no residual gasket material left. I used one of those 120grit paper blades on the grinder to clean it.

I will try some silicone gasket sealer. That looks like my only option.
Thanks guys.
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