Late coil oil filler thread... - Printable Version +- Austinsevenfriends (https://www.austinsevenfriends.co.uk/forum) +-- Forum: Austin Seven Friends Forum (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=1) +--- Forum: Forum chat... (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=14) +--- Thread: Late coil oil filler thread... (/showthread.php?tid=7247) |
Late coil oil filler thread... - Ruairidh Dunford - 03-03-2022 Can anyone tell me what this is, off the top of their head please? RE: Late coil oil filler thread... - dickie65 - 03-03-2022 Hi, I suspect it is a bicycle thread as its a large diameter fine thread. Without finding a tube and measuring the diameter and putting a thread gauge on it I cant help further. https://britishfasteners.com/threads-bsc The above might help have a look at the BSB threads. RE: Late coil oil filler thread... - Ruairidh Dunford - 03-03-2022 Thanks Richard, I will do that, if nobody knows for sure. RE: Late coil oil filler thread... - Steve Jones - 03-03-2022 Just measured one, Ruairidh, and it was 1 1/4" x 20 tpi. Tracy Tools web site lists both taps and dies in that size - BSC Thread - but no stock of taps, only carbon dies. Steve RE: Late coil oil filler thread... - Ruairidh Dunford - 03-03-2022 Very kind Steve, appreciated. R RE: Late coil oil filler thread... - Stuart Giles - 03-03-2022 (03-03-2022, 08:07 PM)Steve Jones Wrote: Just measured one, Ruairidh, and it was 1 1/4" x 20 tpi. Tracy Tools web site lists both taps and dies in that size- BSC Thread - but no stock of taps, only carbon dies. I'd be surprised if that was a 20 TPI cycle thread (60 degree), more likely to be a 20 TPI WF thread I would have thought -All the other 'non standard' threads on the A7 are 55 degree WF. But, once again, Tracy tools only have stock of a carbon die in this size. If Ruairidh is just doing a 'special' oil filler tube, it might be easier (and certainly cheaper) to screwcut the thread in a lathe. A 20 TPI Whitworth tap will do as a chaser if the 'real thing' isn't available to put the finishing crest on the thread. With a milling machine as well as a lathe making a carbon tap from a piece of Silver Steel wouldn't be an impossibility in the absence of a buyable tap. RE: Late coil oil filler thread... - Bob Culver - 04-03-2022 The world got by with carbon taps into the 1900s and, as with drills, only the norm since 1960 or so. RE: Late coil oil filler thread... - Hedd_Jones - 04-03-2022 I had an issue with an engine I bought years ago where the engine was allegedly a runner to go in an APD I had, it was missing the filler (with a rag pushed in), and I thought nothing about it. Trying to recommission it became apparent some numpty had damaged the threads. Being impatient, and not knowing in those days about Tracy tools etc, I just found the mankyiest filler with good threads from the spares pile (some animal had used a stillson on it). I put it in the vice, cut I think 4 slots in it the full height of the thread, then smartened up the cuts to debur and 'sharpen' with a needle file (if you know how to sharpen your own taps you will understand what I mean). I also drilled a hole right through it near the top to insert a T handle, then used this as a makeshift chaser. I screwed it in and out 3 or 4 times with some lube and this worked perfectly. Clearly it put a load of shite in the crankcase so the sump and gauze had to come off. I have never seen the tool from that day to this, so I assume my father weighed it in. RE: Late coil oil filler thread... - Ruairidh Dunford - 04-03-2022 Thank you Stuart -will let you know how I get on. |