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High Temp Thread Sealant - Help Needed |
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Zeb jr
AMC Apprentice Joined: Apr/24/2008 Location: Wisconsin Status: Offline Points: 117 |
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Posted: May/08/2022 at 6:45am |
Hello,
Long story short - I cannot get the rally pak brass T fitting and pipe to stop leaking on my 69 Amx. I replace the fittings the second time just to make sure I didn’t have a crack. Third time I put the high temp permatex on the threads after cleaning (sprayed everything with brakecleen) and let it dry a bit before installing and still leaks… Is there another high temp sealant anyone recommends? Thank you - Zeb jr
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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mstrcrftr
Supporter of TheAMCForum Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
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Swak. By swagelock is the best you can get.
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bbgjc
AMC Addicted Joined: Nov/24/2009 Location: No.VA Status: Offline Points: 1657 |
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Permatex Indianhead Shellac. Works great and lasts forever.
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mixed up
AMC Addicted Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2156 |
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Teflon tape build it up always works for me
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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bbgjc
AMC Addicted Joined: Nov/24/2009 Location: No.VA Status: Offline Points: 1657 |
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Teflon tape is for your sink. Automotive sealants are for cars.
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turbo
AMC Addicted Joined: Oct/26/2008 Location: chicago area Status: Offline Points: 2566 |
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Technically brass fittings should not need any help. It's all compression fittings right?
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they call me Capt RETIRED!
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bbgjc
AMC Addicted Joined: Nov/24/2009 Location: No.VA Status: Offline Points: 1657 |
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I think it's the brass rod into the block and the brass rod into the tee- fitting where he's have issues.
They should be tapered fitting ends and self selling, but who know what version he may have used. |
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Pdok
Supporter of TheAMCForum Joined: Apr/03/2011 Location: Alabama Status: Offline Points: 1021 |
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Permatex 59235. Unlike teflon tape, I have never had anything leak. Air, fuel, oil, water. I use it everywhere I want a permanent seal. I recent replaced an air hose connector that had been sealed for 15 years, and the sealant was still pliable and threads unscrewed without difficulty.
56521 is excellent too as a replacement for teflon tape. Edited by Pdok - May/08/2022 at 10:31am |
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76 Grem X 258/904,4.0 head/MPFI, Comp X250H cam, Hughes springs, Clifford header, serpentine swap.
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Zeb jr
AMC Apprentice Joined: Apr/24/2008 Location: Wisconsin Status: Offline Points: 117 |
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Thank you for all the replies - it is fine thread brass and not compression fittings. I’ve used the loctite and permatex with no success. I do have Hooker SC headers and it’s close - wondering if it’s soaking up header heat and melting the sealant. Also thinking about wrapping it with some kind of heat shield. I am familiar with Swagelok fittings from cryogenic industry - maybe I will try that.
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