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Glow Plug Thread

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Glow Plug Thread

Home › Forums › Beginners questions › Glow Plug Thread

Viewing 8 posts - 1 through 8 (of 8 total)
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  • 5 January 2013 at 20:08 #107998
    Sub Mandrel
    Participant
      @submandrel

      Can anyone confirm what the thread is on a standard glowplug? I measure a slightly oversize 6mm x 0.6 pitch or a slightly undersize 1/4" x 40tpi, but the thread is so short I can't be confident.

      Before anyobne says google -there seems to be just as much confusion out there as here!

      Thanks

      Neil.

      Edited By Stub Mandrel on 05/01/2013 20:10:46

      5 January 2013 at 20:08 #6502
      Sub Mandrel
      Participant
        @submandrel
        5 January 2013 at 20:30 #108002
        Les Jones 1
        Participant
          @lesjones1

          Hi Neil,
          The results from googling "model glow plug thread" seem to indicate the normal thread is 1/4" x 32 tpi This does not match your measured value of 0.6mm / 40 tpi.It looks like the plug you have is not standard.

          Les.

          Edited By Les Jones 1 on 05/01/2013 20:30:50

          5 January 2013 at 20:34 #108003
          JasonB
          Moderator
            @jasonb

            Its a UNEF 1/4×32 so 60degrees unlike out ME 1/4×32 which is 55deg

             

            I got my taps from here when I built the Firefly, fitted perfectly on a standard OS plug

            Edited By JasonB on 05/01/2013 20:37:25

            5 January 2013 at 20:37 #108004
            I.M. OUTAHERE
            Participant
              @i-m-outahere

              According to wikapedia it is 1/4×32 UNEF .

              5 January 2013 at 20:39 #108005
              Michael Gilligan
              Participant
                @michaelgilligan61133

                Neil,

                This seems to confirm Les' findings

                MichaelG.

                 

                Jason beat me to it.

                Edited By Michael Gilligan on 05/01/2013 20:40:00

                5 January 2013 at 21:00 #108009
                Sub Mandrel
                Participant
                  @submandrel

                  Thanks for the rapid responses. I found wikipedia, but there seemed to be some disagreement. I eyeballed the pitch at 0.024" using a caliper (which is why I though 40tpi), but I reckon it is probably a standard one.

                  Not sure I've got 1/4" by 32 ME anyway, but I have a suitable threading tool – a homemade tap should be fine in the aluminium head.

                  Thanks again,

                  neil

                  6 January 2013 at 02:20 #108031
                  Ady1
                  Participant
                    @ady1

                    From the ELFs book they can be 32, 40 and sometimes even 48 TPI

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