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Oil Pan Drain Plug Washer, Inner Diameter

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  • Engine: Oil Pan Drain Plug Washer, Inner Diameter

    Does anyone know the ID of the washer for the oil pan drain plug, on 62/63 V8? I want to pick up a couple of copper/bronze ones if I can find them, but need the ID.

    The parts manual says the plug is 3/8" x 18, but I find that hard to believe. I am guessing maybe 7/16" or 1/2", if memory serves. Does anyone know for sure?

    Thanks

  • #2
    drill out your choice, or as Gravely used: hard plastic

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    • #3
      The 3/8 x 18 they mention is more than likely a pipe thread. The plug thread would have an outside diameter of just over 5/8" and a little less than 11/16", if that helps.

      Officially a 3/8-18 pipe thread should have a 0.675 outer diameter. The one I have here is 0.639" where the flange meets the bottom of the thread.

      Len

      P.S. This is a close off the shelf product. It is metric and has an ID of 17mm, OD of 24mm by 2.5mm thick. http://www.ebay.com/itm/M17-Copper-c...BVwSZ2&vxp=mtr

      Or just order one from a Studebaker vendor.
      Last edited by Skybolt; 03-03-2016, 04:58 AM.

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      • #4
        Originally posted by Skybolt View Post
        The 3/8 x 18 they mention is more than likely a pipe thread. The plug thread would have an outside diameter of just over 5/8" and a little less than 11/16", if that helps.

        Officially a 3/8-18 pipe thread should have a 0.675 outer diameter. The one I have here is 0.639" where the flange meets the bottom of the thread.

        Len

        P.S. This is a close off the shelf product. It is metric and has an ID of 17mm, OD of 24mm by 2.5mm thick. http://www.ebay.com/itm/M17-Copper-c...BVwSZ2&vxp=mtr

        Or just order one from a Studebaker vendor.
        Thanks, this is the info I was hoping for. Only other way woulda been to back a plug out a few threads and put the dial calipers on it. I don't want another fiber one from a vendor. That's why I am going this route.

        Thanks Again

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        • #5
          If it is actually 3/8" pipe then no washer should be needed because pipe thread is tapered and naturally wants to seal the tighter it gets. Neal

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          • #6
            Harbor Freight has a set of copper washers of different sizes for a few bucks. You will have to put them in a lathe and open up the hole to fit right but you will have about 10 of them.

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            • #7
              http://www.idspackaging.com/common/p...signations.htm

              Len
              Last edited by Skybolt; 03-03-2016, 05:41 PM.

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              • #8
                The oil pan drain plug is definitely not a tapered pipe thread. Threads are parallel and not intended to seal. The plug screws into a nut plate that is just spot welded inside the pan. It's not a "bung", and no attempt was made to seal it to the pan. The seal is made by the plug flange and gasket against the skin of the pan.
                By the way, I remember an old story about a bunch of defective plugs getting sold by mistake. The flange wasn't square with the threaded portion and one side bottoms out leaving a gap opposite. The plugs had been put aside for remachining or return for credit, and got loose after Stude closed.
                Mike M.

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