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Flex plate nuts?

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  • Flex plate nuts?

    When I took my engine apart, the old flex plate was held on with castellated nuts:



    Reading the parts manual, what's specified is "Lock Nut - 3/8" x 24." Can I just use plain 3/8" nuts with lock washers, or do I need to hunt down something esoteric?


    [img=left]http://members.cox.net/clarknovak/lark.gif[/img=left]

    Clark in San Diego
    '63 F2/Lark Standard
    http://studeblogger.blogspot.com

    Clark in San Diego | '63 Standard (F2) "Barney" | http://studeblogger.blogspot.com

  • #2
    They LOOK castellated, but they're actually self-locking nuts. The "castled" part is crimped ever-so-slightly to effect a grip on the threads. I'd find something similar. They make self-locking nuts without those cuts or fibre or plastic inserts. Shouldn't be TOO hard to find.

    Miscreant adrift in
    the BerStuda Triangle


    1957 Transtar 1/2ton
    1960 Larkvertible V8
    1958 Provincial wagon
    1953 Commander coupe

    No deceptive flags to prove I'm patriotic - no biblical BS to impress - just ME and Studebakers - as it should be.

    Comment


    • #3
      You most likely want a grade 8 self locking all steel nut. I wouldnt
      use a nylock due to the heat it will be exposed too. Napa carries a
      wide selection of nuts and bolts at most their stores. The one you
      are looking for will look like a regular nut, but be rounded & crushed
      on one side. If you look at the threads on the crushed side you will
      see that the threads are closed in a little. I used this type on my
      700 R4 conversion in the hawk some years ago, and when I removed the
      GM flexplate off the Stude crank - they were snug as a bug in a rug.

      Tom

      '63 Avanti, zinc plated drilled & slotted 03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, soon: 97 Z28 T-56 6-spd, Ported heads w/SST full flow valves, 'R3' 276 cam, Edelbrock AFB Carb, GM HEI distributor, 8.8mm plug wires
      '63 Avanti R1, '03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, TKO 5-spd, Ported heads w/SST full flow valves.
      Check out my disc brake adapters to install 1994-2004 Mustang disc brakes on your Studebaker!!
      http://forum.studebakerdriversclub.c...bracket-update
      I have also written many TECH how to articles, do a search for my Forum name to find them

      Comment


      • #4
        They are actually called "deformed locknuts" and are oval to max 40% of the nut height (if my memory serves me correctly). It is sometimes possible to see the imprints from the jaws used to squash.
        I seem to recall they should not be re-used, just as for the nyloc variety.
        /H

        Comment


        • #5
          Here's what I got from NAPA. Doesn't look like the originals, but they swear it will work. Will this do the trick?




          [img=left]http://members.cox.net/clarknovak/lark.gif[/img=left]

          Clark in San Diego
          '63 F2/Lark Standard
          http://studeblogger.blogspot.com

          Clark in San Diego | '63 Standard (F2) "Barney" | http://studeblogger.blogspot.com

          Comment


          • #6
            That'll do it!

            Miscreant adrift in
            the BerStuda Triangle


            1957 Transtar 1/2ton
            1960 Larkvertible V8
            1958 Provincial wagon
            1953 Commander coupe

            No deceptive flags to prove I'm patriotic - no biblical BS to impress - just ME and Studebakers - as it should be.

            Comment


            • #7
              showbizkid, thats the one I was trying to describe - did I come close?[:I]

              Tom
              '63 Avanti R1, '03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, TKO 5-spd, Ported heads w/SST full flow valves.
              Check out my disc brake adapters to install 1994-2004 Mustang disc brakes on your Studebaker!!
              http://forum.studebakerdriversclub.c...bracket-update
              I have also written many TECH how to articles, do a search for my Forum name to find them

              Comment


              • #8
                Yeah, Tom! Looks just like what you described. Funny - when I went into NAPA, I told the counterkid that I wanted "3/8-inch-24 deformed steel lock nuts." He went and found 'em, and then he asked me "why are they called deformed steel lock nuts?" So I told him it was because the nut was actually deformed by pressure to form the lock.

                He looked at me and said "Oh. We just call 'em lock nuts." [)]


                [img=left]http://members.cox.net/clarknovak/lark.gif[/img=left]

                Clark in San Diego
                '63 F2/Lark Standard
                http://studeblogger.blogspot.com

                Clark in San Diego | '63 Standard (F2) "Barney" | http://studeblogger.blogspot.com

                Comment

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