Thermostat Housing Leak after Thermostat Replacement
#1996916
01/23/16 12:27 PM
01/23/16 12:27 PM
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Joined: Apr 2012
Posts: 364 US
f2502011
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Had too cool of a thermostat (160) pulled it and replaced with a 180 and now the housing is leaking. Used new gasket, thin film of thermostat housing sealer, torqued bolts to spec and it's leaking. What did I do wrong and how can I fix?
1970 EK2 T/A 727
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: f2502011]
#1996918
01/23/16 12:28 PM
01/23/16 12:28 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
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up yours
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what engine?
What housing?
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: f2502011]
#1996941
01/23/16 01:04 PM
01/23/16 01:04 PM
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Joined: Jan 2003
Posts: 21,079 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,079
Niles , Ohio
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Is it the right stat.There are 2 one large one small.Is it leaking or seeping.Big difference.The surfaces must be real clean.I use a new gasket and a thin film of brown Permatex.Never had a leak and I did a bunch at home and the shop.Rocky
Chrysler Firepower
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: therocks]
#1996948
01/23/16 01:13 PM
01/23/16 01:13 PM
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Joined: Apr 2012
Posts: 364 US
f2502011
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Is it the right stat.There are 2 one large one small.Is it leaking or seeping.Big difference.The surfaces must be real clean.I use a new gasket and a thin film of brown Permatex.Never had a leak and I did a bunch at home and the shop.Rocky It's the large one and it's just like the one that came out except it's a 180 instead of a 160. Was really clean and dry. It's seeping out the back middle of the housing trickling down the passenger side of intake and accumulating in the front right bolt crevice. I'm going to pull it back off and use indian head shellac this time.
Last edited by f2502011; 01/23/16 01:20 PM.
1970 EK2 T/A 727
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: f2502011]
#1996982
01/23/16 01:58 PM
01/23/16 01:58 PM
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Joined: Jan 2003
Posts: 21,079 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,079
Niles , Ohio
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Check the housing.They can crack pretty easy at times.That and Ive seen whee the stat shifts a bit and keeps it from sealing.Rocky
Chrysler Firepower
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: f2502011]
#1996991
01/23/16 02:05 PM
01/23/16 02:05 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I've had more trouble with leaking stat housings than anything else I've ever dealt with. Get a new WIDE gasket. Wouldn't hurt to drawfile the housing and the flange it sets on (put a rag inside to catch the shavings). with it installed you should be able to reach in the neck & grab the "arch" & move it a bit which tells you the stat is in the recess tho I dont see that as an issue here but I do check that. On one I had to use "the right stuff" ON a gasket to get it to seal & that is a gasket maker itself in a can, just a real light coat to get a good seal. Still ain't figured out why that piece is so problematic as you'd think it'd be the exact opposite considering its nature. I think using or cutting a new wide gasket is the key & some cement of course
live every 24 hour block of time like it's your last day on earth
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: therocks]
#1996998
01/23/16 02:09 PM
01/23/16 02:09 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Run a draw file across the housing to see if it's flat as well. If you need a replacement, stay away from chromed ones, they don't last.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: mopars4ever]
#1997662
01/24/16 02:06 PM
01/24/16 02:06 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Posts: 36,041
Lincoln Nebraska
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I used the NAPA cast iron one & the width of the flange was thinner than I woulda liked but it did seal with a very thin/even coat of "the right stuff" gasket maker on a cut (wider than OE) piece of gasket material (+ drawfiling both). the nipple has no raised hose barb so I ground one as this is a high psi app & its thick enough there to easily do so. EDIT I think the narrow flanges and slight warpage is the problem cause. If one of those chrome ones has a wide flange (& the barb) I'd like to try one & sand off the chrome/get it flat
Last edited by RapidRobert; 01/24/16 02:15 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: f2502011]
#1997710
01/24/16 03:36 PM
01/24/16 03:36 PM
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Joined: Apr 2012
Posts: 364 US
f2502011
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Appreciate all the input and suggestions. Thing is, it sealed before not sure why it wouldn't again if I can get it done right. I've reinstalled the oem one and used Indian head shellac. We'll see. I do wonder how long I should let it dry?
1970 EK2 T/A 727
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: screamindriver]
#2000378
01/28/16 12:44 PM
01/28/16 12:44 PM
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Joined: Jan 2006
Posts: 360 Ohio
shorthorse
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[/quote] That's a good housing.. I've used the O ring style and have found that over time even those will weep from expansion/contraction..Now if I use that style I add a little RVT to help the sealing duties ... [/quote] I could see that happening but mine are on race cars and they don't get the amount of running time that a street car would have. I know my first one has to be about 8-10 years old and is still holding. I can see where the o-ring could get hard and brittle. They sell replacement o-rings. Have you ever tried that?
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Re: Thermostat Housing Leak after Thermostat Replacement
[Re: f2502011]
#2000506
01/28/16 03:50 PM
01/28/16 03:50 PM
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Joined: Jan 2003
Posts: 75,062 U.S.S.A.
JohnRR
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I Win
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U.S.S.A.
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Appreciate all the input and suggestions. Thing is, it sealed before not sure why it wouldn't again if I can get it done right. I've reinstalled the oem one and used Indian head shellac. We'll see. I do wonder how long I should let it dry? Did you check to make sure it was flat or did you just ignore that suggestion? They do warp over time and you can tighten the bolts all you want, if it's cupped it will not seal. Why did it seal before ?? thicker gasket, more sealer that was allowed to fully cure before coolant being added again ?
running up my post count some more .
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