Hex screw on 67 289 Thermostat housing leaking - Vintage Mustang Forums
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post #1 of 17 (permalink) Old 06-26-2019, 12:37 PM Thread Starter
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Hex screw on 67 289 Thermostat housing leaking

I installed a new thermostat housing that has the hex screw on top, in case you want to put the temp sending sensor there, and coolant keeps seeping thru. Iíve tried Teflon tape around it a couple times already, and still seeping out. Any suggestions on what else to use? 67 Mustang 289.
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post #2 of 17 (permalink) Old 06-26-2019, 12:40 PM
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If Teflon tape isnít working itís probably got a hairline crack, Iíd just replace it.

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post #3 of 17 (permalink) Old 06-26-2019, 03:05 PM
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Yep. It's pipe thread, so it's tapered. If it's leaking there's probably a crack along the side. Replace it.

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post #4 of 17 (permalink) Old 06-26-2019, 03:28 PM
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You can get a complete kit (bolts, thermostat housing, and gasket) for $15. At that price I would just buy a new one!

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post #5 of 17 (permalink) Old 06-26-2019, 04:06 PM
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Just don't get a chrome one, guaranteed to leak.

Nothing worthwhile is ever quick, cheap or easy, those that can't do, complain

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post #6 of 17 (permalink) Old 06-26-2019, 05:20 PM
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If a couple times = a couple turns of teflon tape I'd try a few more. For sprinkler fittings I usually go 7-8 turns. The tape is a lot thinner than it was in the good 'ol days.

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post #7 of 17 (permalink) Old 06-26-2019, 05:34 PM
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I have the same housing installed and it was also leaking at the beginning. 6-7 turns of Teflon tape fixed the issue. Later I installed the T-sensor connected to the dashboard, 6-7 turns of Teflon it it is good.



Keep in mind the direction you wrap the Teflon tape around. I know it is a low brainer, but sometimes I do it wrong at the beginning.



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post #8 of 17 (permalink) Old 06-26-2019, 09:00 PM
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Originally Posted by Mustang4SF View Post
Keep in mind the direction you wrap the Teflon tape around. I know it is a low brainer, but sometimes I do it wrong at the beginning.

I always have to think about it twice before I wrap the tape.
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post #9 of 17 (permalink) Old 06-26-2019, 10:56 PM
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Easy fix... Remove the Thermostat housing....and then remove the threaded hex nut...Then use Permatex SuperBlue Gasket Sealer...on the threads...Let dry overnight...then re-install next day...

She'll never leak again...

)

Tony K.



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post #10 of 17 (permalink) Old 06-27-2019, 01:16 AM
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Or use good old permatex no. 2 and let it dry. It won’t leak either.

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post #11 of 17 (permalink) Old 06-27-2019, 03:31 AM
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....just as long as he doesn't have a crack in the Thermostat Housing...as was possibly suggested above....lol...

Even though Tapered... I've seen them leak too in the past... The tapering helps...but is in no way a guarantee against a leak..

Just Permatex it! Problem solved!

)

Tony K.
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Tony Kovar
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post #12 of 17 (permalink) Old 06-28-2019, 02:49 PM Thread Starter
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Thank you all for the ideas. Will hopefully be working on it again this weekend.
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post #13 of 17 (permalink) Old 07-03-2019, 04:56 PM Thread Starter
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New housing was cracked. Then I cleaned up the old cast one, and was rushing, and didn’t notice that the thermostat slipped down when I was reinstalling, and I cranked her down. Filled with antifreeze and she started pouring out the bottom of the housing. It was hot and humid, and I lost my mind!! Lol. So I cracked that one too!! Just got my new one, and installing now. BTW, great idea the Ford Engineers had when they decided to put the bottom housing bolt behind the water pump!! Thx guys. Now I’m nervous on installing this. Lol. When I was young, I used to do this stuff all the time with no issues. Thx for the help all.
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post #14 of 17 (permalink) Old 07-03-2019, 05:12 PM
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There is an easy trick you can use to avoid the thermostat is moving. Just use a rubber band to hold it in place during the installation. Not my idea, but worked perfectly for me without the need for any kind of adhesive.



Good luck
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post #15 of 17 (permalink) Old 07-03-2019, 07:49 PM Thread Starter
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Got it!! She’s back on the road.
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