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Thermostat housing

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Javelin360 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Javelin360 Quote  Post ReplyReply Direct Link To This Post Topic: Thermostat housing
    Posted: Oct/08/2019 at 6:22pm
I've tried several times on my AMX to seal the thermostat housing. I've had luck with my Javelin using a handmade garlock gasket and RTV along with using a surface plate and sand paper to true up the bottom of the housing. I tried two different housings on the AMX with the above procedure to no avail. I decided to attempt an o-ring solution and it worked.

I sat down with my Autocad 2000 program and a thermostat housing and got to work. The end result was a 2.5mm o-ring slot around the perimeter of the housing. A 2.5mm x 65mm o-ring fits perfectly in this groove. I fabricated a fixture and tranfered my work to the CNC machine and cut the groove. Next I fabricated a fixture to pressure test the housing. I added a bit of water to the housing and test fixture and pressurised to 25psi. No water escaped the joint between the fixture and the housing.

Yesterday I installed the housing on the motor and brought it up to operating temprature, no leaks noted. I then let everything cool down for several hours and checks for leaks and things were dry as a bone. I'll keep an eye on things but I think this mod will function just fine.


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74 Javelin 360/727
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Lenni AMC View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lenni AMC Quote  Post ReplyReply Direct Link To This Post Posted: Oct/08/2019 at 7:24pm
Intrested.
Would you be willing to make some for me ?
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EVF_Sportabout View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EVF_Sportabout Quote  Post ReplyReply Direct Link To This Post Posted: Oct/08/2019 at 8:22pm
I have experienced the same sealing issues.  Your fix is very interesting!  Instead of having you make a bunch of these could you post the CAD or CNC files so I could have a local shop do this to mine?

I absolutely love your creativity!
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PROSTOCKTOM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PROSTOCKTOM Quote  Post ReplyReply Direct Link To This Post Posted: Oct/08/2019 at 8:43pm
Originally posted by EVF_Sportabout EVF_Sportabout wrote:

I have experienced the same sealing issues.  Your fix is very interesting!  Instead of having you make a bunch of these could you post the CAD or CNC files so I could have a local shop do this to mine?

I absolutely love your creativity!
I can't believe that you you would even ask him for the CAD file. I draw CAD and machine custom parts all the time and while this is a simple and easy one to create why would he give his work away for free?

If you have a local shop they will have no problem creating two radius and adding in two fillets.  

Tom
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AMXFSTBK390 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMXFSTBK390 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/08/2019 at 9:49pm
RobMC sells this billet housing that swivels for $99.00. If I ever need one I will get this. I do like the idea of modifying one.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mmaher94087 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/08/2019 at 9:55pm
I guess I'm lame.  I have never had a problem sealing the t-stat housing to the intake manifold.  What or why does this leak occur here?  And, yes, I have built several AMC engines and none leaked.  I'm just curious.  Is this a corroded aluminum T-stat housing issue and a way to preserve them?
Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gremlin1945 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/09/2019 at 12:07am
Same here. Sixes and eights. I've used a straight edge to check for squareness and ran the housing over sandpaper on a flat surface. And I know some people will cringe but I use a light skim of Indian Head when mounting on the manifold.
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390amx1 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 390amx1 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/09/2019 at 5:39am
While a very cool solution I also have never had a problem... a little gasket varnish on the gasket that comes with the thermo and all good...
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Steve_P View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Steve_P Quote  Post ReplyReply Direct Link To This Post Posted: Oct/09/2019 at 6:39am
Look at the picture- the thermostat is heavily corroded on the mounting surface. Sand that flat and make sure the intake is also flat. JB Weld also works well here as a filler if necessary and then sand flat.

And, sorry, but what's wrong with asking him for the cad file? I realize it took some time for him to develop, but people help here all the time sharing knowledge that it took them time and $ to learn. If he doesn't want to share it, that is fine, but there's nothing wrong with asking.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote n3wwl Quote  Post ReplyReply Direct Link To This Post Posted: Oct/09/2019 at 7:43am
Recently replaced the housing on a '69 AMX 390 due to deterioration.  It literally fell apart while removing to replace thermostat.  Sanded the surface, replaced the housing and gasket.  Have not had any leaks after a recent long round trip of 450 miles.

Jay
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