GM 103397, 103374, an 103386 Cotter Pin Sizes - NCRS Discussion Boards

GM 103397, 103374, an 103386 Cotter Pin Sizes

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  • Bill L.
    Expired
    • January 31, 2004
    • 1403

    GM 103397, 103374, an 103386 Cotter Pin Sizes

    Reassembling rear suspension and looking for the correct sized cotter pins.

    Thank you,


    Bill
  • David B.
    Very Frequent User
    • February 29, 1980
    • 688

    #2
    Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

    103397 1-1/4" 5/32 plain
    103374 1" 3/32 plain
    103386 1-1/4" 1/8 plain

    Comment

    • Joe L.
      Beyond Control Poster
      • January 31, 1988
      • 43198

      #3
      Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

      Originally posted by David Bartush (3288)
      103397 1-1/4" 5/32 plain
      103374 1" 3/32 plain
      103386 1-1/4" 1/8 plain

      Dave and Bill------


      Yes, virtually all cotter pins originally used on Corvette were of "plain" finish. Of course, this finish rusts rapidly especially on the chassis where most cotter pins are used. Using stainless steel cotter pins (rather than far more common zinc plated type) best replicates the original finish without being susceptible to rust. Unfortunately, the "loop style" of most stainless steel cotter pins is usually different than the style used on most original GM cotter pins.
      In Appreciation of John Hinckley

      Comment

      • Patrick H.
        Beyond Control Poster
        • November 30, 1989
        • 11616

        #4
        Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

        Here you go:

        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

        • Bill L.
          Expired
          • January 31, 2004
          • 1403

          #5
          Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

          Originally posted by Patrick Hulst (16386)
          Will these be stainless or plain steel?

          I treat the plain still with RPM to prevent rust.

          Thank you! Bill

          Comment

          • Patrick H.
            Beyond Control Poster
            • November 30, 1989
            • 11616

            #6
            Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

            I assume steel, but I'm sure you could call CC and ask.
            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

            • Joe L.
              Beyond Control Poster
              • January 31, 1988
              • 43198

              #7
              Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

              Originally posted by Patrick Hulst (16386)
              I assume steel, but I'm sure you could call CC and ask.

              Bill and Patrick------


              It says in the product description that they are zinc plated steel. Very few of the cotter pins used in PRODUCTION were zinc plated. Most were "plain" (i.e. unfinished) and rust fairly quickly.
              In Appreciation of John Hinckley

              Comment

              • Terry M.
                Beyond Control Poster
                • September 30, 1980
                • 15583

                #8
                Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

                Originally posted by Joe Lucia (12484)
                Bill and Patrick------


                It says in the product description that they are zinc plated steel. Very few of the cotter pins used in PRODUCTION were zinc plated. Most were "plain" (i.e. unfinished) and rust fairly quickly.
                Back when we (Peter Lindahl & I) provided the cotter pin kits to CC we included instructions for removing the zinc plating. We have been out of that business for several years, so I don't know what information is included in their kits.

                We provided them plated because plain cotters would begin to oxidize in storage, handling and packaging. Immersing the cotters in a mild acid, like lemon juice, overnight will remove the zinc plating if that is your desire.
                Terry

                Comment

                • Joe L.
                  Beyond Control Poster
                  • January 31, 1988
                  • 43198

                  #9
                  Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

                  Originally posted by Terry McManmon (3966)
                  Back when we (Peter Lindahl & I) provided the cotter pin kits to CC we included instructions for removing the zinc plating. We have been out of that business for several years, so I don't know what information is included in their kits.

                  We provided them plated because plain cotters would begin to oxidize in storage, handling and packaging. Immersing the cotters in a mild acid, like lemon juice, overnight will remove the zinc plating if that is your desire.

                  Terry-----


                  Actually, I do not recommend removing the zinc plating. I mention that most originals were not plated for the sake of accuracy but I wouldn't go so far as to use un-plated cotter pins. I'd use stainless steel or zinc plated. I hate rust.
                  In Appreciation of John Hinckley

                  Comment

                  • Gary B.
                    Very Frequent User
                    • July 31, 1979
                    • 926

                    #10
                    Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

                    In rust we trust.
                    Vinegar works good also getting zinc plating off. If your in a hurry, Muriatic acid for swimming pools works really well. CRC Sp350 (metal preservative) on them and they look good for a long time.
                    Gary

                    Comment

                    • Bill L.
                      Expired
                      • January 31, 2004
                      • 1403

                      #11
                      Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

                      Originally posted by Gary Bosselman (2575)
                      In rust we trust.
                      Vinegar works good also getting zinc plating off. If your in a hurry, Muriatic acid for swimming pools works really well. CRC Sp350 (metal preservative) on them and they look good for a long time.
                      Gary
                      Hi Gary,

                      I will remove the plating and apply RPM to the cotter pins. Used the RPM on my differential 3 or 4 years ago and not a spec of rust. Same is true of cotter pins already installed elsewhere.

                      Kind Regards,


                      Bill

                      Comment

                      • Terry M.
                        Beyond Control Poster
                        • September 30, 1980
                        • 15583

                        #12
                        Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

                        Originally posted by Gary Bosselman (2575)
                        In rust we trust.
                        Vinegar works good also getting zinc plating off. If your in a hurry, Muriatic acid for swimming pools works really well. CRC Sp350 (metal preservative) on them and they look good for a long time.
                        Gary
                        Be very careful with Muriatic Acid. The vapors from it will oxidize (rust) everything in your garage. I have no swimming pool maintenance experience, so I don't know what concentration of this product is used in them. Where are our chemically dependent members?
                        Terry

                        Comment

                        • Joe L.
                          Beyond Control Poster
                          • January 31, 1988
                          • 43198

                          #13
                          Re: GM 103397, 103374, an 103386 Cotter Pin Sizes

                          Originally posted by Terry McManmon (3966)
                          Be very careful with Muriatic Acid. The vapors from it will oxidize (rust) everything in your garage. I have no swimming pool maintenance experience, so I don't know what concentration of this product is used in them. Where are our chemically dependent members?

                          Terry------


                          Muriatic acid is a term often used in industry for hydrochloric acid. It's actually an obsolete term but it's still widely used. If I were going to use it for removing zinc plating from cotter pins, I would use an extremely dilute solution. Actually, I think using something like citric acid or acetic acid would be safer and better. Vinegar represents an easy source for acetic acid.
                          In Appreciation of John Hinckley

                          Comment

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