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C2 oil pans

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  • Gary G.
    Frequent User
    • July 31, 1998
    • 51

    #16
    Re: C2 oil pans

    2-3/8" it is, so I assume the repair method is the same only all I need now is a hardened 1/2-20 nut.

    Comment

    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43203

      #17
      Re: C2 oil pans

      Originally posted by Gary Guttenberg (30880)
      2-3/8" it is, so I assume the repair method is the same only all I need now is a hardened 1/2-20 nut.
      Gary-----


      ....and those are quite easy to come by. Any hardware store that carries SAE grade 5 or 8 will have what you need. The problem is that welding or brazing in the nut might be more difficult than the plate.

      I would use the drain plug to align the new nut. Then, with the drain plug torqued to specification, weld or braze the nut in place. The nut MUST be perfectly aligned and welded/brazed around its entire perimeter or you'll end up with a leak, for sure.
      In Appreciation of John Hinckley

      Comment

      • Harry S.
        Extremely Frequent Poster
        • July 31, 2002
        • 5292

        #18
        Re: C2 oil pans

        As Joe said, you do not want a leak. Consider grinding away 3/4 of the old nut, weld the new nut to the old nut to retain the integrity of the outside seal. You may have to remove the threads in the old nut so the new bolt goes in easily.


        Comment

        • Gary G.
          Frequent User
          • July 31, 1998
          • 51

          #19
          Re: C2 oil pans

          Thanks for all your help. I plan on having this done in the tool room at work this week. I'll let you know how it works out.

          Comment

          • Jeff A.
            Very Frequent User
            • January 1, 2000
            • 312

            #20
            Re: C2 oil pans

            Why would I need to remove the old plate?
            Couldn't I just weld the new one right on top of the stripped one?

            The original drain plug is long enough to thread through both plates.
            If I spot weld a small spot on each side, the oil can still flow between the 2 plates when draining.

            does anyone see a problem doing it that way?
            Sure would make it a lot easier.
            Attached Files
            My Cars

            Comment

            • Harry S.
              Extremely Frequent Poster
              • July 31, 2002
              • 5292

              #21
              Re: C2 oil pans

              Jeff, did you account for the thickness of the oil pan and the external washer. After I did the threads on my plug only made it half way through the new plate. I did not feel that was enough.
              Last edited by Harry S.; February 24, 2009, 02:25 PM.


              Comment

              • Jeff A.
                Very Frequent User
                • January 1, 2000
                • 312

                #22
                Re: C2 oil pans

                well - with my pan off - I was going to grind away the old flange.
                But upon closer inspection I thought it was very close.

                The old flange is not completely striped out - just finicky.
                I was doing this as a precaution only to prevent trouble down the line.
                It looks like you are right - I will not catch very many treads.

                However - If I get a good bite on some of the treads - that might be all i need to prevent any problems - I think.

                Going to do this in the morning tomorrow - will have to take a close look.
                You may be right - I may need to reduce the thickness of the old flange
                Attached Files
                My Cars

                Comment

                • Joe L.
                  Beyond Control Poster
                  • February 1, 1988
                  • 43203

                  #23
                  Re: C2 oil pans

                  Originally posted by Jeff Ashen (33409)
                  well - with my pan off - I was going to grind away the old flange.
                  But upon closer inspection I thought it was very close.

                  The old flange is not completely striped out - just finicky.
                  I was doing this as a precaution only to prevent trouble down the line.
                  It looks like you are right - I will not catch very many treads.

                  However - If I get a good bite on some of the treads - that might be all i need to prevent any problems - I think.

                  Going to do this in the morning tomorrow - will have to take a close look.
                  You may be right - I may need to reduce the thickness of the old flange
                  Jeff-----


                  There are also other ways to repair the thread damage. One way would be just to weld up the hole in the plate. Then, drill and tap. It's just 1/2-20 thread, so it's a common tap.
                  In Appreciation of John Hinckley

                  Comment

                  • Jeff A.
                    Very Frequent User
                    • January 1, 2000
                    • 312

                    #24
                    Re: C2 oil pans

                    that would be very easy -
                    I already suggested that - that was what I was going to do.

                    My engine builder was not happy.
                    So I promised him- I would replace the flange.
                    My Cars

                    Comment

                    • Chuck S.
                      Expired
                      • June 30, 1991
                      • 184

                      #25
                      Re: C2 oil pans

                      I had the same problem on my `65 with 61,000 original miles. I purchased a self-tapping device with a drain plug inside of the self-tapping plug. It`s been fine for 10 years. Some day I`ll remove the pan and put in a hardened steel plate. I did keep the original drain plug.

                      Comment

                      • Jeff A.
                        Very Frequent User
                        • January 1, 2000
                        • 312

                        #26
                        Re: C2 oil pans

                        That is exactly what my engine builder wanted to do.

                        But no way!! I wanted to keep the original 7/8" plug size.
                        My Cars

                        Comment

                        • Joe L.
                          Beyond Control Poster
                          • February 1, 1988
                          • 43203

                          #27
                          Re: C2 oil pans

                          Originally posted by Jeff Ashen (33409)
                          That is exactly what my engine builder wanted to do.

                          But no way!! I wanted to keep the original 7/8" plug size.

                          Jeff-----


                          So, if I understand you correctly, your engine builder was ok with the idea of using a self-tapping repair plug with a non-standard drain plug but he looked with disdain on the idea of welding up the hole in the plate, drilling and tapping for a standard plug? Strange----very strange.
                          In Appreciation of John Hinckley

                          Comment

                          • Jeff A.
                            Very Frequent User
                            • January 1, 2000
                            • 312

                            #28
                            Re: C2 oil pans

                            what can I say? - he said the weld job might leak
                            My Cars

                            Comment

                            • Jeff A.
                              Very Frequent User
                              • January 1, 2000
                              • 312

                              #29
                              Re: C2 oil pans

                              After careful examination, and looking for the easiest way out...

                              I decided not to grind off the old flange.
                              Instead, I welded an upside-down castle nut to the old flange.

                              The threads grab the plug about half way, and the castle part allows the oil to flow through.

                              It turned out to be a great fix.
                              I welded with the bolt in place, then I re-tapped the threads, and it all turned out perfect.
                              Attached Files
                              My Cars

                              Comment

                              • Gary G.
                                Frequent User
                                • July 31, 1998
                                • 51

                                #30
                                Re: C2 oil pans

                                My part of this story ended last year when I ground the old nut down 3/4 and welded a new on top of the remainder. One interesting point is all of yours seem to be 1/2-20, mine was 9/16-18. Try finding one of those at the local hardware store. I ended up buying a box of them from McMaster-Carr.

                                Comment

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