Thread Sealant on Temp Sender Threads - NCRS Discussion Boards

Thread Sealant on Temp Sender Threads

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  • Gary C.
    Administrator
    • October 1, 1982
    • 17920

    #31
    Re: Thread Sealant on Temp Sender Threads

    Dom, on dissimilar metals try CRC Freeze Off. I use it on manifold studs and nipples. Spray every 5 minutes for 30 minutes and then try to remove the stud or pipe nipple. Works all the time on studs and most of the time on pipe nipples.

    WHIW, Gary....
    NCRS Texas Chapter
    https://www.ncrstexas.org/

    https://www.facebook.com/profile.php?id=61565408483631

    Comment

    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43272

      #32
      Re: Thread Sealant on Temp Sender Threads

      All-------


      Once-upon-a-time, many, many years ago, I installed one of these temp senders using sealer on the threads. I found I had erratic gauge operation and I could not figure out why. Finally, it came to me that maybe the sealer was causing a grounding problem. So, I removed the sealer, re-installed the sender and the gauge worked perfectly. Absolutely no leaks, either.

      The threads on these temp senders are "dryseal". They require no sealer. So, why use sealer when none is required?
      In Appreciation of John Hinckley

      Comment

      • Joe C.
        Expired
        • August 31, 1999
        • 4598

        #33
        Re: Thread Sealant on Temp Sender Threads

        Originally posted by Joe Lucia (12484)
        All-------


        Once-upon-a-time, many, many years ago, I installed one of these temp senders using sealer on the threads. I found I had erratic gauge operation and I could not figure out why. Finally, it came to me that maybe the sealer was causing a grounding problem. So, I removed the sealer, re-installed the sender and the gauge worked perfectly. Absolutely no leaks, either.

        The threads on these temp senders are "dryseal". They require no sealer. So, why use sealer when none is required?
        Hi Joe,

        I don't doubt what you say about "dryseal", and, honestly, this is the first time I have ever heard of that type of thread.

        If all of these temp sender threads are "dryseal" then it's probably the best kept secret in the automotive world. This becomes more apparent when you consider the fact that some temp senders are sold with PTFE tape already applied to the threads.

        Comment

        • Joe L.
          Beyond Control Poster
          • February 1, 1988
          • 43272

          #34
          Re: Thread Sealant on Temp Sender Threads

          Originally posted by Joe Ciaravino (32899)
          Hi Joe,

          I don't doubt what you say about "dryseal", and, honestly, this is the first time I have ever heard of that type of thread.

          If all of these temp sender threads are "dryseal" then it's probably the best kept secret in the automotive world. This becomes more apparent when you consider the fact that some temp senders are sold with PTFE tape already applied to the threads.

          Joe------


          You will often see the abbreviation "NPT" used for pipe threads (meaning "national pipe thread"). However, there is another abbreviation, "NPTF". The latter is the abbreviation for a modified NPT also known as "Dryseal". This type of thread is designed to seal without the use of any sealer. This is the type of thread used for Corvette and other Chevrolet temp senders.

          Why do some temp senders have a sealer pre-installed on the threads? I do not know. However, it might be that temp senders for some applications did not use NPTF threads.
          In Appreciation of John Hinckley

          Comment

          • Jim L.
            Extremely Frequent Poster
            • September 30, 1979
            • 1817

            #35
            Re: Thread Sealant on Temp Sender Threads

            Originally posted by Joe Lucia (12484)
            Joe------


            You will often see the abbreviation "NPT" used for pipe threads (meaning "national pipe thread"). However, there is another abbreviation, "NPTF". The latter is the abbreviation for a modified NPT also known as "Dryseal".
            I've heard of both of these, but have never known how they differ. I would assume that NPTF threads are tapered like NPT threads are; what is different?

            Jim

            Comment

            • Joe L.
              Beyond Control Poster
              • February 1, 1988
              • 43272

              #36
              Re: Thread Sealant on Temp Sender Threads

              Originally posted by Jim Lockwood (2750)
              I've heard of both of these, but have never known how they differ. I would assume that NPTF threads are tapered like NPT threads are; what is different?

              Jim
              Jim-----


              NPTF threads appear just like NPT. The difference has to do with a slight difference in the "peaks" and "valleys" of the threads. With NPTF the "peaks" and "valleys" are designed to effectively achieve an "interference fit" when assembled.

              So, why don't they just make all NPT threads NPTF? I don't know.
              In Appreciation of John Hinckley

              Comment

              • Joe C.
                Expired
                • August 31, 1999
                • 4598

                #37
                Re: Thread Sealant on Temp Sender Threads

                Originally posted by Jim Lockwood (2750)
                I've heard of both of these, but have never known how they differ. I would assume that NPTF threads are tapered like NPT threads are; what is different?

                Jim
                This may answer your question, and it may raise more. First, see post # 24. Then go here:



                pay particular attention to the diagrams on page 3 "parallel pipe thread" and "tapered pipe thread" as they compare to the screw threads above them. This should correlate to what was stated in post # 24.

                After doing all of that, your next question might be: If the pictures shown for both straight and tapered pipe threads show full contact at the root/crest interfaces, then are both JIS B0202 and B0203 equivalent to NPTF threads?

                Comment

                • Pat M.
                  Extremely Frequent Poster
                  • April 1, 2006
                  • 1582

                  #38
                  Re: PS

                  Originally posted by Joe Ciaravino (32899)
                  Nnnnnnnnnoooooooooooooooomnemmennommennnneommmnmnm aaaaaaaarrrrrrrrr


                  That there ain't no Eye-talian temp gauge.

                  It's a Polish temp gauge.

                  Why?

                  Because the blue line is there to tell you where to lay the meat thermo.

                  Now, if that there were a Muslim temp gauge, you'd be instructed to insert the pointed end directly through the hose while shouting الله هو جيد


                  That there ain't no Eye-talian gas gauge, it's an Irish dick measuring stick.

                  Is that an NCRS approved accessory belt? How about the galvanized tower clamp? If not, then you should be ashamed of yourself. No soup for you!

                  Joe - great stuff ... you soup fascist!!

                  Comment

                  • Domenic T.
                    Expired
                    • January 29, 2010
                    • 2452

                    #39
                    Re: Thread Sealant on Temp Sender Threads

                    Originally posted by Gary Chesnut (5895)
                    Dom, on dissimilar metals try CRC Freeze Off. I use it on manifold studs and nipples. Spray every 5 minutes for 30 minutes and then try to remove the stud or pipe nipple. Works all the time on studs and most of the time on pipe nipples.

                    WHIW, Gary....
                    Gary,
                    Thanks, I will get some for future use.

                    The one in my aluminum manifold was in there from day one and the aluminum actually bonded between the pipe threads along threads with a piece of the flange that I couldn't remove from the nipple.

                    I think old antifreeze and age did the job of the permenant bond.

                    I saw this with pistons that bonded with the rings , they were soaked in Kroil, heated, and finally beaten to death by the mechanic. They were as if they were cast together and you could see a white powder ( corrosion) between the rings and the pistons.
                    Some one had a name for it welding by????.

                    DOM

                    Comment

                    • Clem Z.
                      Expired
                      • January 1, 2006
                      • 9427

                      #40
                      Re: Thread Sealant on Temp Sender Threads

                      Originally posted by Domenic Tallarita (51287)
                      Gary,
                      Thanks, I will get some for future use.

                      The one in my aluminum manifold was in there from day one and the aluminum actually bonded between the pipe threads along threads with a piece of the flange that I couldn't remove from the nipple.

                      I think old antifreeze and age did the job of the permenant bond.

                      I saw this with pistons that bonded with the rings , they were soaked in Kroil, heated, and finally beaten to death by the mechanic. They were as if they were cast together and you could see a white powder ( corrosion) between the rings and the pistons.
                      Some one had a name for it welding by????.

                      DOM
                      water and aluminum don't go well together.

                      Comment

                      • Joe L.
                        Beyond Control Poster
                        • February 1, 1988
                        • 43272

                        #41
                        Re: Thread Sealant on Temp Sender Threads

                        Originally posted by Domenic Tallarita (51287)
                        Gary,
                        Thanks, I will get some for future use.

                        The one in my aluminum manifold was in there from day one and the aluminum actually bonded between the pipe threads along threads with a piece of the flange that I couldn't remove from the nipple.

                        I think old antifreeze and age did the job of the permenant bond.

                        I saw this with pistons that bonded with the rings , they were soaked in Kroil, heated, and finally beaten to death by the mechanic. They were as if they were cast together and you could see a white powder ( corrosion) between the rings and the pistons.
                        Some one had a name for it welding by????.

                        DOM

                        Dom------


                        This sort of "phenomenon" is caused by dis-similar metal (galvanic) corrosion.
                        In Appreciation of John Hinckley

                        Comment

                        • Domenic T.
                          Expired
                          • January 29, 2010
                          • 2452

                          #42
                          Re: Thread Sealant on Temp Sender Threads

                          Thanks Joe,
                          Unless one has seen it it is hard to explain how 2 different kinds of metal unite without possibility of use again.

                          DOM

                          Comment

                          • Joe L.
                            Beyond Control Poster
                            • February 1, 1988
                            • 43272

                            #43
                            Re: Thread Sealant on Temp Sender Threads

                            Originally posted by Domenic Tallarita (51287)
                            Thanks Joe,
                            Unless one has seen it it is hard to explain how 2 different kinds of metal unite without possibility of use again.

                            DOM
                            DOM------


                            Aluminum and iron are pretty far apart on the electronegativity scale. The further apart that metals are, the greater the propensity for galvanic corrosion. It doesn't just occur with aluminum and iron. Copper and iron are great for this problem, too.
                            In Appreciation of John Hinckley

                            Comment

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