Coolant Temp Sensor/Permatex Thread Sealant Question
Coolant Temp Sensor/Permatex Thread Sealant Question
I just installed a new Coolant Temp Sensor, and used permatex high temp thread sealant.
It says 4 hours you can adjust it, and 72 for full cure.
How Long should I wait to drive it? 4 hours? Or will it cure regardless of use?
It says 4 hours you can adjust it, and 72 for full cure.
How Long should I wait to drive it? 4 hours? Or will it cure regardless of use?
Pro Wrench
Joined: Nov 2015
Posts: 1,935
Likes: 189
From: Coastal Georgia
Sensor/manifold should have tapered pipe threads designed to prevent leaks. Sealant is primarily used to prevent seeps in pipe thread applications. You should be fine after several minutes and more than good to go after waiting the 4 hour adjustment period. Adjustment period is given because if it's hardened/cured too much and moved it might break the seal. Waiting for the full cure would be advisable if you noticed sloppy thread fit during install.
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Last edited by number9; Jan 8, 2018 at 11:41 AM.
Sensor should have a tapered pipe thread which may or may not leak even without any sealant. You should be more than good to go after waiting the 4 hour adjustment period. Adjustment period is given because if it's hardened/cured too much and moved it might break the seal.
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Thanks number9, that is kind of what I figured.
TReK
Joined: Feb 2013
Posts: 2,514
Likes: 656
I use that sealant all the time and technically it needs to cure for 24 hours before you pressurize.
But in this case it doesn't matter because the coolant temp sensor, either MEK100160 or MEK500130
has an aluminum washer to make the seal. The threads are M12-1.5
Last edited by OverRover; Jan 8, 2018 at 12:10 PM.
Thanks Overrover. Rave manual says to use sealant, so maybe it is a double measure.
TReK
Joined: Feb 2013
Posts: 2,514
Likes: 656
You're right RAVE mentions both the sealant and the washer. And that's how I do it too (not 577, but the high temp Permatex).
From your 1st post IDK if you were using only the sealant and not the washer.
It's the washer that's really making 100% of the seal.
Last edited by OverRover; Jan 8, 2018 at 12:50 PM.
I drove it to Expedition Autowerks here in MPLS to get the BCU put in and synced. Seemed to be just fine.The temp sensor was way off based in my engine temps on the way over.But yes, I followed RAVE. Used the high temp sealant and the washer comes with the sensor
Last edited by CollieRover; Jan 8, 2018 at 01:48 PM.
Pro Wrench
Joined: Nov 2015
Posts: 1,935
Likes: 189
From: Coastal Georgia
has an aluminum washer to make the seal
Thanks very good to know information. Assumed threads would be tapered for the hot coolant application and didn't know what the heck I was writing about thread wise. The LR engineers saw some benefits of doing away with many/most tapered pipe threads and using a sealing washer. Should we safely assume if a crush washer or o-ring is shown in the parts diagram the threads are straight?
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TReK
Joined: Feb 2013
Posts: 2,514
Likes: 656
It's been my experience that's a good base to start from, but I always check/inspect threads just to be sure.
I have not seen a NPT thread ever seal with a washer. I'm not saying it doesn't exist, but I have not come across the application for it. Just by the design NPT or BSPT threads seal because of the taper, and helped along with the use of sealant/pipe dope or tape.
That being said I still use a very small amount of sealant on straight threads just as a lubricant.
Right or wrong and maybe overkill, but it's just habit.
I like this stuff > https://www.permatex.com/products/th...hread-sealant/
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