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Belair-o
01-07-2020, 07:45 AM
I plumbed in a remote transmission fluid cooler for the TH350 in my 57. There is a brass thermostatic sensor for the fan, which threads into a fitting in the fluid flow. I just used standard white thread sealant tape on the sensor threads. Looks like that was a bad choice, as I am getting some weeping of ATF from the sensor threads. Is there a better sealant I should be using on the sensor threads?
Thanks, Doug

Rick_L
01-07-2020, 08:02 AM
If it is a pipe thread, then yes you used the correct sealant. Have you tried tightening it more?

56Safari
01-07-2020, 08:05 AM
https://www.permatex.com/products/thread-compounds/thread-sealants/permatex-high-temperature-thread-sealant/

edited the post with the higher temp sealant..

55 Rescue Dog
01-07-2020, 08:41 AM
I've usually seem to have the best luck with Loctite 567 thread sealant for metal fittings. I've been using it for at least 30 years, after working in maintenance in a diesel engine factory, that's all we used, except for when tape is a better choice for like plastic fittings, etc.

Belair-o
01-07-2020, 10:59 AM
Thanks for the replies! I will tweak the tightness on the fitting if possible, and if that fails, I have some Loctite 567 on hand that I will substitute. Thanks, Doug

Belair-o
01-22-2020, 09:49 AM
Update: The combination of Loctite 567 and likely tightening the fitting a bit more than I did before fixed the weeping leak I had in my transmission cooler temperature sensor fitting. Good to have that leak fixed.

carls 56 (RIP 11/24/2021)
01-23-2020, 01:03 PM
that is good to hear. they all seem to mark their spot in some way.

Belair-o
01-24-2020, 05:56 AM
Yep. :) I am seeking minor victories, trying to get this static build back to dynamic!