SpitFire6 Posted June 24, 2020 Report Share Posted June 24, 2020 (edited) NPS National Pipe Seal?. 4 different threads? BSPP BSPT NPTNPTP NPS It is clear which are parallel threads and require a seal ring & which are taper threads and do not require or could use a sealing ring. A/F is not diameter same as Taper diameter is not marked size. Marked size is suitable pipe size to connect.BSP means nothing. M20 plug. A/F or diameter? Be nice to see a magnet on the filtered flow? PS. I thought the oil pressure was NPT and the galley plugs on the 6 the same. Edited June 24, 2020 by SpitFire6 NPTP Not! Link to comment Share on other sites More sharing options...
NonMember Posted June 24, 2020 Report Share Posted June 24, 2020 49 minutes ago, SpitFire6 said: PS. I thought the oil pressure was NPT and the galley plugs on the 6 the same. There are definitely a good few NPT threads in the oil-ways of the Triumph 6, but not all of them the same (maybe not even all NPT) Then there's that aluminium beast of a plug above the filter, which is some huge taper thread, tightened up then battered flat to prevent you undoing it. Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 24, 2020 Report Share Posted June 24, 2020 5 minutes ago, NonMember said: There are definitely a good few NPT threads in the oil-ways of the Triumph 6, but not all of them the same (maybe not even all NPT) Then there's that aluminium beast of a plug above the filter, which is some huge taper thread, tightened up then battered flat to prevent you undoing it. I've ordered 4 1/8NPT pressure transmitters. Screwed if they are not. Link to comment Share on other sites More sharing options...
Nick Jones Posted June 24, 2020 Report Share Posted June 24, 2020 56 minutes ago, NonMember said: Then there's that aluminium beast of a plug above the filter, which is some huge taper thread, tightened up then battered flat to prevent you undoing it That one is actually UNF. 3/4" IIRC I have a chunk of cut-down bolt in mine. Itself drilled and tapped to take a fitting to feed my external oil pipe to the front of the main gallery. The gallery plugs are a nightmare on the six. No logic at all. Nick Link to comment Share on other sites More sharing options...
Peter Truman Posted June 24, 2020 Report Share Posted June 24, 2020 On the previous page there was ref to 1/2in sump drive sockets I sometimes use the sq drive, but 15 years ago I brought these profile cut spanners made from S/S esp for sump plugs off UK ebay, very well made and have the two ends orientated at 90 degrees so you can always fit in a tight place. The spanner is 1/4in thick. I brought and a dozen for our clubs shop and they all sold. Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 25, 2020 Report Share Posted June 25, 2020 isnt it amazing who would have thought 4 pages on a sump plug ...brilliant Pete Link to comment Share on other sites More sharing options...
Paul H Posted June 25, 2020 Report Share Posted June 25, 2020 Should the copper flat washer on the Canleys magnetic sump plug be changed yearly ? Paul Link to comment Share on other sites More sharing options...
KevinR Posted June 25, 2020 Report Share Posted June 25, 2020 12 minutes ago, Paul H said: Should the copper flat washer on the Canleys magnetic sump plug be changed yearly ? Paul New washer every time you change the oil - or just anneal the old one with a blow torch and reuse it 1 1 Link to comment Share on other sites More sharing options...
Paul H Posted June 25, 2020 Report Share Posted June 25, 2020 1 hour ago, Pete Lewis said: isnt it amazing who would have thought 4 pages on a sump plug ...brilliant Pete Lets see if we can hit 5 pages ! On the todo list for my Vitesse is to add a drain plug to the diff . I have the tapered square end plug . What sized drill do I need plus tap spec. If there is a more suitable plug would go with that Paul Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2020 Report Share Posted June 25, 2020 (edited) 1 hour ago, Paul H said: Lets see if we can hit 5 pages ! On the todo list for my Vitesse is to add a drain plug to the diff . I have the tapered square end plug . What sized drill do I need plus tap spec. If there is a more suitable plug would go with that Paul Yes, the one that is removed with an Allen key. Square ended are no good. Edited June 25, 2020 by SpitFire6 added pic 1 Link to comment Share on other sites More sharing options...
Badwolf Posted June 25, 2020 Report Share Posted June 25, 2020 Not come across the one with the Allen key. Do you have a link... it must, of course fit!!! (5 pages here we come) 1 Link to comment Share on other sites More sharing options...
Colin Lindsay Posted June 25, 2020 Report Share Posted June 25, 2020 I had one of those in the Herald sump; seized solid and a bu&&er to remove. I just couldn't get leverage with the allen key. Link to comment Share on other sites More sharing options...
Peter Truman Posted June 25, 2020 Report Share Posted June 25, 2020 With all these pro’s n con’s we could go for 6 pages! Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2020 Report Share Posted June 25, 2020 The brass plug will never corrode in cast iron or steel. 304SS will also never corrode & I doubt you will never damage it removing. PTFE tape always wise. 1 Link to comment Share on other sites More sharing options...
Mad4classics Posted June 25, 2020 Report Share Posted June 25, 2020 On 24/06/2020 at 09:26, Colin Lindsay said: That's the way I always took it to be, the hole is just a straight-through tapped drilling - try it with a normal bolt which you'll know isn't tapered - and the plugs are tapered. Sump, gearbox and diff are all straight-through. OK, @Pete Lewisand @Colin LindsayI'm trying to get to a fifth page. Unsurprising I haven't got a 3/8 NPS bolt; so thinking about your comment I made up a GO NOGO gauge for the internal IDs' of NPT and NPS because curiosity got the better of me. I've got an FD axle with no drain plug and measuring the casing threads in that it's definitely straight i.e. NPS. Now, I've got a really odd early alloy gearbox with Spitfire ratios fitted (some PO might have had aspirations to racing?); measured the casing threads on that and it's definitely tapered i.e NPT. Even to the naked eye you can see it's tapered! I didn't want to test the engine sump drain plug as I've only recently changed the oil; but I suspect it will turn out straight perhaps when I get a chance to measure it. So I've got a mix of straight and taper casing threads but the same plug fits all of them!!!! This then goes back to my comment about bean counters; did Triumph start using the straight thread a) With the cast iron casings? b) When the diff drain plug was dropped as an additional cost saving? ( I haven't got an early one to measure) c) Is the gearbox always different anyway????! (I haven't got a later one to measure.) The other thing I found was that the one original plug I've got is 3/8" square whereas all the replacements I've bought because they'd been badly mangled are 7/16 square. do'oh! I remember coming across a thread on another triumph site where an owner had fitted a straight plug in a taper alloy casing hole and stripped the thread by over-tightening it. The fit of straight plug in a taper casing is all wrong! The bottom line is I think you need to know exactly what you've got before you depart from the taper plug Triumph specified. But if you're after something different, a search for 3/8NPT plugs in general threw up Advanced Fluid Solutions they've got all sorts and they have an eBay outlet. https://www.advancedfluidsolutions.co.uk/solid-hex-or-allen-key-male-blanking-plugs-481-c.asp So rather than completely answering this I've thrown up more questions. Going for that fifth page! David Link to comment Share on other sites More sharing options...
Colin Lindsay Posted June 25, 2020 Report Share Posted June 25, 2020 My last sump plug was NCP... I found it in a car park.... 1 Link to comment Share on other sites More sharing options...
Chris A Posted June 25, 2020 Report Share Posted June 25, 2020 10 minutes ago, Colin Lindsay said: My last sump plug was NCP... I found it in a car park.... That's the first description of the plug thread I have understood 🙄 1 Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2020 Report Share Posted June 25, 2020 (edited) The female part of the thread will look/is parallel. PS. Looks ONLY! UPDATED Edited June 26, 2020 by SpitFire6 Removed is parallel Link to comment Share on other sites More sharing options...
Iain T Posted June 25, 2020 Report Share Posted June 25, 2020 5 hours ago, SpitFire6 said: The brass plug will never corrode in cast iron or steel. 304SS will also never corrode In the Galvanic Scale stainless steel is further away from iron than brass. This scale gives the liklihood of corrosion between materials. Providing the material is fit for purpose the closer the materials are the better to prevent corrosive interaction. Are we getting near page 5? I'm sure some chemist's or metallurgist would love to chip in! Iain Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2020 Report Share Posted June 25, 2020 3 minutes ago, Iain T said: In the Galvanic Scale stainless steel is further away from iron than brass. This scale gives the liklihood of corrosion between materials. Providing the material is fit for purpose the closer the materials are the better to prevent corrosive interaction. Are we getting near page 5? I'm sure some chemist's or metallurgist would love to chip in! Iain Correct. Brass is more noble than ferrous. The ferrous will corrode as its anodic. Link to comment Share on other sites More sharing options...
Iain T Posted June 25, 2020 Report Share Posted June 25, 2020 Can't find husband or wife on the Scale, must be too far apart to get on an A4 sheet! Link to comment Share on other sites More sharing options...
Iain T Posted June 25, 2020 Report Share Posted June 25, 2020 10 minutes ago, SpitFire6 said: Correct. Brass is more noble than ferrous. The ferrous will corrode as its anodic I told my wife I was a noble but when she says it she seems to leave out the 'le'! 1 Link to comment Share on other sites More sharing options...
Gadgetman Posted June 25, 2020 Author Report Share Posted June 25, 2020 5 minutes ago, Iain T said: I told my wife I was a noble but when she says it she seems to leave out the 'le'! 😂 Link to comment Share on other sites More sharing options...
SpitFire6 Posted June 25, 2020 Report Share Posted June 25, 2020 A dozen or so Zinc anodes bonded to the metal and you could park in a pond. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted June 25, 2020 Report Share Posted June 25, 2020 2 hours ago, Iain T said: Are we getting near page 5? I'm sure some chemist's or metallurgist would love to chip in! Iain I've found a Baking Chemist that will probably make chips if asked... http://thebakingchemist.blogspot.com/2012/07/cocolate-chip-cheescake-bars.html Link to comment Share on other sites More sharing options...
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