Teflon tape + ATF
Elder User
Joined: Feb 2004
Posts: 909
Likes: 9
From: San Luis Obispo, CA
I doubt it, but you probably do not need the tape. It should only be used on tapered pipe threads and its job is not to seal anything, but to reduce friction to allow the pipe fittings to be tightened up enought to get the tapered threads to seal. Pipe dope is a greasey substance that also does the job. A permatex type sealer that is designed to seal automotive chemicals is probably a better thing to use. The small pipe threads in automotive use are more often over-tightened, causing cracks which no tape or sealer will fix.
Senior User
Joined: Jan 2007
Posts: 292
Likes: 0
From: SE Alabama
I used some teflon tape after cross threading a line going into the trans cooler. (dumb mistake, I know) Trans fluid would leak even when tightened, so I wrapped it in some teflon tape and problem solved. So far I would say "no" to your quesiton... I HOPE!
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Post Fiend
Joined: Jul 2005
Posts: 8,462
Likes: 4
From: Durant, OK (SOSU)
Ok...the drain bolt on my tranny was leaking just a little bit. Torqueing it slightly more stopped the leak, but I was going for a little extra protection.
Thank you both.
Thank you both.
Elder User
Joined: Feb 2004
Posts: 909
Likes: 9
From: San Luis Obispo, CA
With your drain plug, the seal is a washer-gasket. Putting anything on the threads is not the right way to solve the problem. If the old washer gives out, then it should be replaced.
If you have damaged pipe threads, there are products in the locktite area that are made to seal problem threads. Look in the chemicals section of a big auto parts place. If the damage is bad enough and you have no other choice, clean very thoroughly and epoxy it together. (You won't be taking it apart, but it should not leak.)
I have no objection to using teflon tape, properly applied, instead of pipe dope. I prefer pipe dope and you can even get pipe dope with teflon in it.
If you have damaged pipe threads, there are products in the locktite area that are made to seal problem threads. Look in the chemicals section of a big auto parts place. If the damage is bad enough and you have no other choice, clean very thoroughly and epoxy it together. (You won't be taking it apart, but it should not leak.)
I have no objection to using teflon tape, properly applied, instead of pipe dope. I prefer pipe dope and you can even get pipe dope with teflon in it.
Last edited by acheda; Mar 15, 2007 at 07:04 PM. Reason: add info
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Never use Teflon tape on an automatic transmission or power steering system. The small pieces of tape will damage parts causing a reduced service life or even outright failure.
Use paste type pipe dope only on tapered threads.
Straight thread fittings seal either thru the use of a gasket, O-ring, seal-ring, or metal to metal seals. Do not use Teflon tape or pipe dope on straight threads.
Use paste type pipe dope only on tapered threads.
Straight thread fittings seal either thru the use of a gasket, O-ring, seal-ring, or metal to metal seals. Do not use Teflon tape or pipe dope on straight threads.
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