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Old 01-08-2017, 03:01 PM
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What do you guys do for thermostat housing gaskets?

FSM says to put sealant on both sides of the gasket before mating the t-stat housing to the head, and torque to 13ft-lbs. i put a little bead, it leaks. i put a bit more than a little bead, it leaks. used napa's gasket, it leaks. oreilly's, leaks. every time i install a new thermostat it's always by luck that the coolant doesn't weep through the gasket or sealant.

so what do you guys do or recommend i do to remedy this? the worst i can think is that the housing is warped, but ran a straight edge square on the gasket mating surfaces and couldn't tell.

TIA -Joe
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Old 01-08-2017, 03:22 PM   #2
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I'd double check the housing to be certain it isn't warped. If not try using Permatex High Tack gasket sealant. https://www.permatex.com/products/ga...asket-sealant/

Apply a good coat to both sides of the gasket, and follow the directions. I also coat the fastener threads with a good sealant if they go into the water jacket.

On problem areas, I coat both sides of the gasket and let it tack up for about 10 minutes. I hang the gasket on a wire or nail, then I coat the thermostat housing and the engine block with the stuff and let that set up a few minutes as well. Some say that step isn't necessary. Then reassemble everything and give it an hour or so before adding any fluids, overkill. Just be certain everything is 100% clean and 100% dry.

If the housing is warped, replace it.
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Old 01-08-2017, 03:22 PM   #3
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Are you getting both the block and housing mating surfaces perfectly clean? If not you will have a leak.

For problem areas, this doesn't set up and makes disassembly in the future easier:
Hylomar Universal Blue Sealant - PL32
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Old 01-08-2017, 03:36 PM
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Both surfaces were clean. I let it tack up for a little overy 5 minutes because I had applied the sealant and got sidetracked from something. I assembled the t-stat and housing, but didn't add any coolant then because the radiator didn't get installed until the next morning.
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Old 01-08-2017, 03:41 PM   #5
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Both surfaces were clean. I let it tack up for a little overy 5 minutes because I had applied the sealant and got sidetracked from something. I assembled the t-stat and housing, but didn't add any coolant then because the radiator didn't get installed until the next morning.
To be honest you are probably spending more on sealant than the cost of a new housing, they are about $15 and readily available at most auto parts outlets, even there in Hilo.
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Old 01-08-2017, 04:12 PM   #6
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I had a hell of a time fixing my coolant leak, i tried different methods of sealing the gasket, new housing, the problem was my hose was leaking at the top and dribbling down making it look like the housing was leaking.

I bought silicon hoses on ebay for $38 shipped to hawaii from china 10 day wait, and used 2 turbo clamps at that junction, no more leak. not the same on i got but you get the idea:

Silicone Radiator Heater Hose Kit For Jeep Wrangler TJ 4.0L 97-01 98 99 00 Blue | eBay
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Old 01-08-2017, 04:34 PM
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Jim, you're probably right. Well I just got back from the store with a new housing. Surprisingly they had one in Stock. $9 after my Napa reward was applied lol. Got a felpro gasket just to be safe. Will advise. And thank you all for the help. -Joe
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Old 01-08-2017, 04:36 PM
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Btw Jack, I forgot to mention that the hoses are new. Replaced them when the new rad was installed. Those hoses you mentioned look nice however.
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Old 01-08-2017, 04:57 PM   #9
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Jim, you're probably right. Well I just got back from the store with a new housing. Surprisingly they had one in Stock. $9 after my Napa reward was applied lol. Got a felpro gasket just to be safe. Will advise. And thank you all for the help. -Joe
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Old 01-08-2017, 05:41 PM   #10
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the worst i can think is that the housing is warped, but ran a straight edge square on the gasket mating surfaces and couldn't tell.
I typically lap a thermostat housing before reinstalling. Seldom do I find one that is reasonably true before lapping.

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