Can Loctite Blue and/or Red be used as an airtight thread sealant? Not just as a thread locker- I have something I'm working on that needs to be airtight and Teflon tape won't work.
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Aug. 11, 2011 6:13 p.m. RexSeven SuperDork
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Aug. 11, 2011 7:20 p.m. benzbaron Dork
I think I've seen RTV used on threads or use teflon pipe dope, I don't like the idea of removing something with copious amounts of lock tite on it. Figure if pipe dope is good enough to seal high pressure gases it would probably work for your application.
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Aug. 11, 2011 7:33 p.m. Taiden HalfDork
I like to use RTV black when on the threads I replace a PCV. Not that it means anything for you.
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Aug. 11, 2011 8:13 p.m. fasted58 Dork
Thread seal tape and pipe dope are not a thread sealant per se, they are a merely lubricant designed to aid in deforming the male to female threads which do make the seal.
Red or blue loctite should serve the same purpose as it seems viscous enough and it could help a fitting from loosening due to vibration. I've used anti-sieze on steel to aluminum also, like an intake. We used a loctite industrial pipe dope on vibrating equipment that dried like an epoxy, damn that was good stuff but I haven't seen it in years. JB Weld might be worth a try if the threads are shot and all else fails, just leave the first thread or two bare.
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Aug. 11, 2011 8:27 p.m. Toyman01 SuperDork
Form-A-Gasket is what I use. You might want to get it apart someday.
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Aug. 11, 2011 8:57 p.m. RexSeven SuperDork
It's an A/C fitting (R12 to R134a). I don't know if I will be removing it any time soon.
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Aug. 11, 2011 9:11 p.m. chandlerGTi Reader
Why don't you find loctite brand thread sealant? You can usually find it at plumbing stores.
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Aug. 11, 2011 10:04 p.m. motomoron HalfDork
A/C fittings are flares generally as far as I'm aware. The threads should be clamping force only, not pressure retention. See hotlinked pics...
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Aug. 11, 2011 10:08 p.m. RexSeven SuperDork
The R134a conversion fitting screws onto the old R12 stem sticking out from the low pressure side of the refrigerant line. It was an Autozone kit and the new R134a fitting had some threadlocker already on it. Unfortunately, it wasn't enough to prevent a leak even after I cleaned the old gunk out of the stem's screw threads.
Note: The A/C system was emptied of R12 by an A/C shop before I began work.
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Aug. 12, 2011 5:54 a.m. 44Dwarf Dork
Red can be but Green (bearing and sleeve retainer) is best for pressure sealing. add 1 drop screw in remove and add second drop screw in and tighten.
Loctite is spec-ed for use on many aftermarket brake master cylinders.44
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Aug. 12, 2011 6:25 a.m. KATYB HalfDork
it shouldnt be seeling via the threads.... should seal agaisnt the flare surface or via an oring.
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Aug. 12, 2011 6:26 a.m. KATYB HalfDork
and most of conversions ive seen have u leave schadervalve in and on goes over the outside...
