THERMOSTAT "GASKETS"
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From: Banner WY Pop 42, yes 42
THERMOSTAT "GASKETS"
Replaced the water pump last weekend and when I removed the thermostat I noticed two gaskets. One was the square O-ring on the bottom and than it had a cork flat gasket that went on top of the thermostat. I couldn't find any reference to a second gasket. I am the second owner and i talked to the original owner and she said that she has not replaced the water pump or the thermostat. The new pump came with the square O-ring only which I used and it leaked like crazy. I took it back apart and put black Permatex on both sides of the thermostat and all its fine. Has anyone seen or heard of the second cork thermostat gasket?
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,352
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From: Lake Hartwell, GA
The thermostat housing and pump mating surface has been a problem child for a lot of us. We normally do just as you have and use an anti-freeze rated sealant of some sort very lightly spread on the pump surface then remount the thermostat housing. Let it dry a bit and call it good for the next 5 years...
Hotshot
Joined: Mar 2012
Posts: 10,590
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From: Texas
Not sure why more don't do this. I have used it on all 7.3s I have owned, this being my fourth one. It is cheap, uses an O-Ring, not a crappy gasket, and has never leaked on me when installed properly (torqued in a pattern). No messy RTV needed either. Makes for a nice, clean install.
https://www.strictlydiesel.com/p-267...sing-ring.aspx
https://www.strictlydiesel.com/p-267...sing-ring.aspx
Hotshot
Joined: Mar 2012
Posts: 10,590
Likes: 382
From: Texas
Originally Posted by SaintITC
Sounds like a good fix, but $10 more gets you the one piece aluminum billet housing, from either them or Riffraff...
Because racetruck
Joined: Apr 2007
Posts: 2,786
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From: Monterey Bay, CA
I haven't ever seen a billet housing leak except for dieselsites a few years ago. Get one from Riffraff and be done with it permanently.
http://www.riffraffdiesel.com/riffraff-diesel-7-3l-billet-thermostat-housing/
http://www.riffraffdiesel.com/riffraff-diesel-7-3l-billet-thermostat-housing/
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