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Can't stop stat housing leak
#113272
08/31/08 10:24 PM
08/31/08 10:24 PM
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Joined: Nov 2007
Posts: 1,522
Orleans, Ontario
moparcanuk
OP
pro stock
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OP
pro stock
Joined: Nov 2007
Posts: 1,522
Orleans, Ontario
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I'm on my 3rd stat housing unit and it's still leaking where it meets the block. When I took the first chrome one off, it was warped. So I bought another chromed one from Chrysler. It was ok for a week but then started leaking at the same spot. When I took the second one off, I saw that it had also warped. So I got one off a 60s Mopar and put it on. Was ok for a few hours then started leaking again.  I've tried everything: new gaskets every time, "goop" on the gaskets and even tried two gaskets once. No luck.  I have't taken off the third one yet so am asking for some advice as to how I can stop my stat housing from warping/leaking. 
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Re: Can't stop stat housing leak
[Re: moparcanuk]
#113273
08/31/08 10:32 PM
08/31/08 10:32 PM
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Joined: Sep 2003
Posts: 7,833
east side of Ohio
basketcase
master
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master
Joined: Sep 2003
Posts: 7,833
east side of Ohio
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have you double checked the pump housing? the only T Stat housing I've ever had leak were the chrome ones.are you using silicone? I use the brown gasket sealer. a mechinac I used to work with used weatherstrip sealer when he overhauled engines. a royal pain to get off, but never had a leak.
Dave
1981 Dodge D150 360 auto
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Re: Can't stop stat housing leak
[Re: DirectSubjection]
#113277
08/31/08 10:39 PM
08/31/08 10:39 PM
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Joined: Nov 2007
Posts: 1,522
Orleans, Ontario
moparcanuk
OP
pro stock
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OP
pro stock
Joined: Nov 2007
Posts: 1,522
Orleans, Ontario
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Quote:
Big block I take it - try running the mating surface on a belt sander for a bit to flatten it out. Leaking chrome housings are a very common problem. 
I opted for an o-ringed Chevy housing to avoid the problem. 
Yes, bb 440. Already did the belt sander trick before putting on the last one. 
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Re: Can't stop stat housing leak
[Re: JohnRR]
#113278
08/31/08 10:44 PM
08/31/08 10:44 PM
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Joined: Jan 2003
Posts: 20,736
Eagle, Idaho
Neil
The Doctor is in.
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The Doctor is in.
Joined: Jan 2003
Posts: 20,736
Eagle, Idaho
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Quote:
Take your latest one , get a piece of 8.5x11 emery paper and double sided tape it to a known flat surface , run the thermo housing over it in a figure 8 pattern till you a get a good clean contact pattern.
I did this on my used chevy t-stat housing. I colored the bottom with a magic maker and sanded until the color was all gone.
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Re: Can't stop stat housing leak
[Re: Neil]
#113279
08/31/08 10:54 PM
08/31/08 10:54 PM
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Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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2 I had several leaky aluminum SB thermostat housings in the past, now I block sand them down flat before installation, and no more leaks.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: Can't stop stat housing leak
[Re: 79powerwagon]
#113282
09/01/08 09:01 AM
09/01/08 09:01 AM
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Joined: Nov 2007
Posts: 1,522
Orleans, Ontario
moparcanuk
OP
pro stock
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OP
pro stock
Joined: Nov 2007
Posts: 1,522
Orleans, Ontario
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Quote:
Easiest solution is to simply NOT use a chrome housing at all. Mine is in the bottom of the lake now, and I just use a painted iron one. Never a problem again! 
My third stat housing is off a late 60s Mopar - very light, aluminum? Straightened the bottom before installing. Still leaking.
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Re: Can't stop stat housing leak
[Re: moparcanuk]
#113284
09/01/08 09:38 AM
09/01/08 09:38 AM
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Joined: Jan 2003
Posts: 75,089
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,089
A Banana Republic near you.
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Quote:
Quote:
Easiest solution is to simply NOT use a chrome housing at all. Mine is in the bottom of the lake now, and I just use a painted iron one. Never a problem again!
My third stat housing is off a late 60s Mopar - very light, aluminum? Straightened the bottom before installing. Still leaking.
then you have a leak coming from someplace else , like the hose connection ? or something is cracked ? what does the water pump housing surface look like ?
you are putting it together properly ? bolts not to long and bottoming out in the housing making you THINK its bolted down properly ?
fly me up ,i'll fix it 
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Re: Can't stop stat housing leak
[Re: 70sixpkrt]
#113288
09/01/08 10:17 PM
09/01/08 10:17 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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My brothers 318 gave me fits leaking at t-stat, left gasket out, use a good qual sealer, nice even bead and let sit 24hrs before refilling. 
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Re: Can't stop stat housing leak
[Re: RapidRobert]
#113289
09/01/08 10:45 PM
09/01/08 10:45 PM
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Joined: Sep 2003
Posts: 7,833
east side of Ohio
basketcase
master
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master
Joined: Sep 2003
Posts: 7,833
east side of Ohio
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drill an 1/8" hole in the stat while you're there.
haven't heard that one before, what does that do?
thanks!
Dave
1981 Dodge D150 360 auto
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PS as mentioned buff the chrome off then figure 8 sand it to level it, draw file WP housing(BB I'm assuming) to level it, use a gasket with permatex #2 in the tube & drill an 1/8" hole in the stat while you're there.
