T8Hants Posted July 16, 2018 Share Posted July 16, 2018 I have had my 3HW since 1983 and have yet to hear it run, it has only 5000 genuine miles on the clock and was used for 6 months in 1947 having been sold off as un-issued ex-WD. I now realise at 64 my endless supply of round tuits and wheni cans is probably limited so I thought I had better finish the thing and get riding it. I need to get the clutch off and the puller that I though came with it is a 1" by 20tpi and wont go on (I haven't forced it) can someone confirm what I think I am picking up on the net that I need a 1" x 26tpi cycle thread puller for a 3HW clutch basket. I would be grateful some kind soul confirm that is the correct tool or tell me what I should be looking out for - Thank-you. Gareth Quote Link to comment Share on other sites More sharing options...
Ron Posted July 16, 2018 Share Posted July 16, 2018 (edited) I just checked mine (I have a 3SW and a 3HW) It is indeed 1" x 20tpi. Draganfly have them but don't mention the tpi. https://draganfly.co.uk/index.php/accessories-a-misc/product/36952- PS I see what you mean on the internet where 26tpi is mentioned for singles. I suppose it depends if a later clutch is fitted? Since Draganfly quote the correct part number, it might be an idea to phone and ask them. Ron Edited July 16, 2018 by Ron Quote Link to comment Share on other sites More sharing options...
T8Hants Posted July 16, 2018 Author Share Posted July 16, 2018 Thanks for that Ron, I managed to find my thread gauges and also did a check with a whit bolt the puller is confirmed at 20TPI. So time to libate the Triumph with another cash sacrifice, I assume they are UNF thread. For those who like the details mine is a Feb 1945 machine, the 744th into the last contract, frame TL54192 a picture of the start of I hope the final full restoration. Gareth Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted July 16, 2018 Share Posted July 16, 2018 26 minutes ago, T8Hants said: Thanks for that Ron, I managed to find my thread gauges and also did a check with a whit bolt the puller is confirmed at 20TPI. So time to libate the Triumph with another cash sacrifice, I assume they are UNF thread. Hi Gareth, UNF? good grief no! 1" x 20 tpi is a BSC (British Standard Cycle thread Quote Link to comment Share on other sites More sharing options...
Ron Posted July 16, 2018 Share Posted July 16, 2018 (edited) No UNF on a 3HW Gareth. Either BSCycl, BSF or Whitworth. The 20 tpi is BSCycle which has a different thread angle to UNF. Ron Typing together Richard! Edited July 16, 2018 by Ron Quote Link to comment Share on other sites More sharing options...
T8Hants Posted July 16, 2018 Author Share Posted July 16, 2018 Thanks both, you are beginning to understand why the machine only got to the 'bolt all the bits back together' stage, I'm no mechanic. I though BSC was all 26TPI, life long learning is a good thing! Gareth Quote Link to comment Share on other sites More sharing options...
Ron Posted July 16, 2018 Share Posted July 16, 2018 BSC is Whitworth form with a thread angle of 60 degrees. UNF is 55 degrees. You can use them together, but definitely not good working practice. Ron Quote Link to comment Share on other sites More sharing options...
T8Hants Posted July 17, 2018 Author Share Posted July 17, 2018 I examined the thread on my puller last night under a glass and the 1st third has been curled over which was why it wouldn't start. I might have a go at restoration as I have some needle files, I can't make it any worse. Quote Link to comment Share on other sites More sharing options...
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