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High Temp Thread Sealant - Help Needed
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BU1 View Drop Down
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Points: 2009 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BU1 Quote  Post ReplyReply Direct Link To This Post Posted: May/08/2022 at 10:17pm
Originally posted by Zeb jr Zeb jr wrote:

I also might try some different fittings to see if I can eliminate the long 1/8 tube that has the rally pak sending unit only an inch and half from the passenger header tube. 
 
 I ditched that 3 1/2" pipe nipple and used a 1" close nipple. The sending unit for the gauge points back and sits just above the oil filter. Idiot light sender points up.


Edited by BU1 - May/08/2022 at 10:40pm
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#1 1968 AMX Rally Green 343 Z code 4spd since 1975 #02642
#2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959
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Points: 5457 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: May/09/2022 at 12:19am
Originally posted by Zeb jr Zeb jr wrote:

Steve P. 

I agree - something doesn’t make sense. I figured I had it last summer with the high-temp Permatex. After installing I let it dry for two days before testing it and everything was good until I drove it 30 plus miles yesterday. 

I’m going to try something stronger - either the Indian shellac or aviation grade sealant. I also might try some different fittings to see if I can eliminate the long 1/8 tube that has the rally pak sending unit only an inch and half from the passenger header tube. 


1)  Which high-temp Permatex did you use?
2)  You drove it for a year with no leak ("had it last summer")?

The Loctite I recommend does not 'dry', it is an anaerobic sealant that cures in the absence of air.  Permatex 59235 is the equivalent but I can get Loctite easier.  I would be surprised if either of these couldn't solve your problem.


Edited by 6PakBee - May/09/2022 at 12:24am
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Points: 598 		Post Options Post Options   Thanks (0) Thanks(0)   Quote S Curry Quote  Post ReplyReply Direct Link To This Post Posted: May/09/2022 at 8:20am
All the comments on teflon tape. My experience....20 years in a coal fired power plant. We used teflon tape on everything. On pressure up to 1200#. Very damn few failures and those found were do to cleanliness.....
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Points: 117 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Zeb jr Quote  Post ReplyReply Direct Link To This Post Posted: May/09/2022 at 9:59am
IIRC - the directions for the Permatex stated you should let it cure before use. At that point I figured that was my smoking gun as I was putting it together and then immediately driving it to test it. Also, I live in Wisconsin so I usually put it away in late September for the winter - so the car will sit for roughly 6 months. The Deacon sealant is $95 a pint so… will go with the $3 Indian Shellac and eliminate the 1/8 pipe. 
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Points: 2009 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BU1 Quote  Post ReplyReply Direct Link To This Post Posted: May/09/2022 at 10:37am
What parts have you physically changed? There is only 1 brass T and the pipe nipple for the Rally Pack. Maybe one of the sending units is defective?????  Which joint shows leakage??? You have 4 possibilities, 5 if you count the fitting going into the block.

Edited by BU1 - May/09/2022 at 10:40am
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#1 1968 AMX Rally Green 343 Z code 4spd since 1975 #02642
#2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959
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Points: 117 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Zeb jr Quote  Post ReplyReply Direct Link To This Post Posted: May/09/2022 at 12:21pm
It’s not leaking at the T fitting, senders or upper part of the 1/8 pipe. It’s always leaking at the bottom of the 1/8 pipe where the adapter threads into the factory fitting. Maybe my 51 year old fitting on the block is bad…
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Points: 2009 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BU1 Quote  Post ReplyReply Direct Link To This Post Posted: May/09/2022 at 12:33pm
Originally posted by Zeb jr Zeb jr wrote:

 
It’s always leaking at the bottom of the 1/8 pipe where the adapter threads into the factory fitting.  
 
 What adapter?? The 1/8" pipe threads directly into the factory fitting. Can you post a picture of what you have?
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#2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959
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Points: 2009 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BU1 Quote  Post ReplyReply Direct Link To This Post Posted: May/09/2022 at 12:44pm
Here is mine. I used good old Permatex #2 on the threads.
 
 


Edited by BU1 - May/10/2022 at 1:15pm
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#2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959
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Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote hdx Quote  Post ReplyReply Direct Link To This Post Posted: May/20/2022 at 3:10pm
I always use red high temp lock tight on those fittings .
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