Correct coatings on reproduction trailing arm bolt and rear spring mount plate bolt - NCRS Discussion Boards

Correct coatings on reproduction trailing arm bolt and rear spring mount plate bolt

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Jerod M.
    Expired
    • March 10, 2011
    • 95

    Correct coatings on reproduction trailing arm bolt and rear spring mount plate bolt

    On the right is a reproduction trailing arm bolt. On the left is a reproduction rear spring mount plate bolt.

    I have never seen the "real things", but the coatings on the fasteners don't seem correct. Could someone please let me know what the proper coatings should be?

    1971
    Attached Files
  • Joseph M.
    Expired
    • June 30, 1999
    • 334

    #2
    Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

    Trailing arm bolts s/b cad/zinc. Leaf spring plate s/b black oxide.

    Comment

    • Jerod M.
      Expired
      • March 10, 2011
      • 95

      #3
      Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

      Thanks, Joseph. It's hard to tell in the picture, but do your trailing arm bolts have a tapered tip on them?

      Comment

      • Alan S.
        Extremely Frequent Poster
        • July 31, 1989
        • 3415

        #4
        Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

        Hi Jerod,
        In addition to Joseph's reply you may find the infrmation in the post by Joe L., that's part of this linked thread, useful.
        I don't know if you've seen it or not.
        Regards,
        Alan

        https://www.forums.ncrs.org/showthre...+bolt&uid=2482
        71 Coupe, 350/270, 4 speed
        Mason Dixon Chapter
        Chapter Top Flight October 2011

        Comment

        • Joseph M.
          Expired
          • June 30, 1999
          • 334

          #5
          Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

          The trailing arm bolts have a tapered rounded end. They should also have a hole for a cotter pin. Not sure where you got the bolts you displayed, but Paragon or AMK typically have, but not always, reproduction hardware with the correct finish and headmarkings.

          Comment

          • Alan S.
            Extremely Frequent Poster
            • July 31, 1989
            • 3415

            #6
            Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

            Hi Jerod,
            I looked at your picture again after your question and Joseph's reply.
            I notice the spring mouting bolts have a longer part of the bolt threaded than the originals. I'm not sure if this matters or not. Might the threads damage the side of the longer/lower spring leaves?
            Regards,
            Alan

            These are replated originals, (and 1 of Terry M's cotter pins), from my 71.
            Attached Files
            71 Coupe, 350/270, 4 speed
            Mason Dixon Chapter
            Chapter Top Flight October 2011

            Comment

            • Bill C.
              Expired
              • July 15, 2007
              • 904

              #7
              Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

              hey

              just an FYI -- there is probably a good chance the repro bolts for the spring plate are going to be to long.

              Compare the new ones to your old originals. If the new ones are longer - DO NOT USE them. Get your old ones replated.

              Maybe they have gotten better with the bolt lengths now - but not sure.

              Bill

              Comment

              • Jerod M.
                Expired
                • March 10, 2011
                • 95

                #8
                Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

                Originally posted by Bill Chamberlain (47576)
                hey

                just an FYI -- there is probably a good chance the repro bolts for the spring plate are going to be to long.

                Compare the new ones to your old originals. If the new ones are longer - DO NOT USE them. Get your old ones replated.

                Maybe they have gotten better with the bolt lengths now - but not sure.

                Bill
                Okay, I will check them. I only have two originals, so I was really hoping they were going to be correct.

                Comment

                • Jerod M.
                  Expired
                  • March 10, 2011
                  • 95

                  #9
                  Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

                  Originally posted by Joseph Mule (32435)
                  The trailing arm bolts have a tapered rounded end. They should also have a hole for a cotter pin. Not sure where you got the bolts you displayed, but Paragon or AMK typically have, but not always, reproduction hardware with the correct finish and headmarkings.
                  I bought them from Ecklers. (foul or okay vendor?) They look correct, but I'm not sure about head markings. The zinc is bright rather than grey and no spangle. Big issue?

                  Comment

                  • Jerod M.
                    Expired
                    • March 10, 2011
                    • 95

                    #10
                    Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

                    Originally posted by Alan Struck (15579)
                    Hi Jerod,
                    In addition to Joseph's reply you may find the infrmation in the post by Joe L., that's part of this linked thread, useful.
                    I don't know if you've seen it or not.
                    Regards,
                    Alan

                    https://www.forums.ncrs.org/showthre...+bolt&uid=2482
                    Thanks for this great link.
                    I see a theme...
                    Black Phosphate
                    Zinc
                    Plain

                    Looks like I need to order a black phosphate plating kit and a zinc plating kit. For the plain I assume I can degrease, wire wheel, and spray a light clear to prevent corrosion.

                    Comment

                    • Joe L.
                      Beyond Control Poster
                      • February 1, 1988
                      • 43198

                      #11
                      Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

                      Originally posted by Jerod Matlock (53045)
                      Thanks for this great link.
                      I see a theme...
                      Black Phosphate
                      Zinc
                      Plain

                      Looks like I need to order a black phosphate plating kit and a zinc plating kit. For the plain I assume I can degrease, wire wheel, and spray a light clear to prevent corrosion.

                      Jerod-----

                      I wouldn't bother with re-plating. Paragon and their dealers have excellent reproductions of the trailing arm bolt and related parts as well as the spring retainer plate bolts. However, the trailing arm bolts you already have might be OK. I just can't see them well enough in your photo to say, for sure.
                      In Appreciation of John Hinckley

                      Comment

                      • Patrick H.
                        Beyond Control Poster
                        • December 1, 1989
                        • 11616

                        #12
                        Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

                        Originally posted by Jerod Matlock (53045)
                        Thanks for this great link.
                        I see a theme...
                        Black Phosphate
                        Zinc
                        Plain

                        Looks like I need to order a black phosphate plating kit and a zinc plating kit. For the plain I assume I can degrease, wire wheel, and spray a light clear to prevent corrosion.
                        The trailing arm bolts you show are already zinc plated, which is correct. Zinc plating is shiny silver - just go check out the zinc stuff in the hardware store. Much of today's zinc is shinier than many years ago, but it's the same stuff.

                        FYI, to remove the zinc from the spring bolts you can strip them with muriatic acid. It will bubble as the hydrogen is released, so watch out for acid spatter.

                        Patrick
                        Vice-Chairman (West), Michigan Chapter NCRS
                        71 "deer modified" coupe
                        72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
                        2008 coupe
                        Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

                        Comment

                        • Ronald L.
                          Extremely Frequent Poster
                          • October 18, 2009
                          • 3248

                          #13
                          Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

                          Couple of things here...

                          Black oxide would not be a chassis finish as it has zero corrosion resistance. I see half way down we're talking of black phos which is the proper finish.

                          If you strip these bolts with acid...
                          Make sure you bake them to remove the hydrogen embrittlement, or you could have a catastrophic event.

                          Zinc today and yesterday....

                          Most of the fasteners back in this time period were just zinc, they had a corrosion requirement and the zinc coating had to be adequate to pass that spec. Later on yellow chromate or clear chromate were added as corrosion enhancers and those impart the blueish bright and or yellow look.

                          Comment

                          • Ronald L.
                            Extremely Frequent Poster
                            • October 18, 2009
                            • 3248

                            #14
                            Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

                            If you plan to judge the car, you need to pay close attention to the head marks as the catalog stores just sell what ever and while you might get past a local show usually the national judges can know those differences.

                            Comment

                            • Joe L.
                              Beyond Control Poster
                              • February 1, 1988
                              • 43198

                              #15
                              Re: Correct coatings on reproduction trailing arm bolt and rear spring mount plate bo

                              Originally posted by Ronald Lovelace (50931)
                              If you plan to judge the car, you need to pay close attention to the head marks as the catalog stores just sell what ever and while you might get past a local show usually the national judges can know those differences.
                              Ron------


                              I seriously doubt that any judge will ever see the headmarkings on these trailing arm pivot bolts except, perhaps, those doing a Survivor judging.
                              In Appreciation of John Hinckley

                              Comment

                              Working...
                              Searching...Please wait.
                              An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

                              Please push the back button and reload the previous window.'
                              An unexpected error was returned: 'Your submission could not be processed because the token has expired.

                              Please push the back button and reload the previous window.'
                              An internal error has occurred and the module cannot be displayed.
                              There are no results that meet this criteria.
                              Search Result for "|||"