Colin Posted October 11 Author Report Share Posted October 11 Is that what's known as interference fit?? C. Link to comment Share on other sites More sharing options...
johny Posted October 11 Report Share Posted October 11 I think thats it - basically an NPT thread but slightly adapted for interference to prevent leakage... Link to comment Share on other sites More sharing options...
Colin Posted October 11 Author Report Share Posted October 11 I shall ask the question . . . Merlin Motorsports Best C Link to comment Share on other sites More sharing options...
johny Posted October 11 Report Share Posted October 11 I get the impression that its a forgotten specification now, certainly this side of the pond, and most people wont know what youre talking about. Its probably got to be NPT with teflon tape☹️ Link to comment Share on other sites More sharing options...
Iain T Posted October 11 Report Share Posted October 11 Although I bought the NPTF plug I didn't use it and wrapped my Gold Magnetic sump plug with PTFE tape and it's now bone dry no leaks 😁 Iain Link to comment Share on other sites More sharing options...
johny Posted October 11 Report Share Posted October 11 yes perhaps it always was a bit optimistic that an interference thread was going to seal time after time without any assistance! It was probably designed as an install once and leave alone in which case it might have worked... Link to comment Share on other sites More sharing options...
Peter Truman Posted October 11 Report Share Posted October 11 (edited) 2 hours ago, Iain T said: Although I bought the NPTF plug I didn't use it and wrapped my Gold Magnetic sump plug with PTFE tape and it's now bone dry no leaks 😁 Iain Didn't like the idea of ptfe so on the daughters Mk2 Spit which leaked profusely even after trying several old tapered sump plugs I used Permatex Thread Sealant, High Pressure 56521, you don't use a lot and keep run in thread free and only use a little on 3/4 of a turn, supposedly doesn't set and easy to break free (time will tell!) Importantly it hasn't leaked, so happy now for the other leaks Edited October 11 by Peter Truman Link to comment Share on other sites More sharing options...
Iain T Posted October 11 Report Share Posted October 11 6 minutes ago, Peter Truman said: Permatex Thread Sealant, High Pressure 56521 Ha the hi-tech solution! I only used a couple of turns and only at the end of the thread. Iain Link to comment Share on other sites More sharing options...
SpitFire6 Posted October 11 Report Share Posted October 11 Hi, Strange as my sump plug is parallel thread and seals on a copper washer that gets heated cherry red before reusing. Cheers, Iain. Link to comment Share on other sites More sharing options...
johny Posted October 12 Report Share Posted October 12 Yes thats a non standard alternative but the rim of the hole in the sump wasnt designed for sealing and Im not sure its even possible on the gearbox/diff... Link to comment Share on other sites More sharing options...
Colin Posted October 12 Author Report Share Posted October 12 Same thread on yhe 'box?? I certainly don't have any washer. I've had to file the sides of the plug flat several times (told you I was belt & braces!). Mick Dolphin reckons the top rear corner engine seal nut is the same as sump &'box ( what's it there fir, anyway?) . . . but couldn't remove any he had for love nor money to try it!! Best, C Link to comment Share on other sites More sharing options...
Iain T Posted October 12 Report Share Posted October 12 11 hours ago, SpitFire6 said: my sump plug is parallel thread and seals on a copper washer that gets heated cherry red before reusing. My PO fitted a parallel plug with a copper washer but it never sealed so I bought the Gold NPT and NPTF plugs. Iain Link to comment Share on other sites More sharing options...
johny Posted October 12 Report Share Posted October 12 1 hour ago, Colin said: Mick Dolphin reckons the top rear corner engine seal nut is the same as sump &'box ( what's it there fir, anyway?) . . . but couldn't remove any he had for love nor money to try it!! Best, C I believe it goes to the cooling circuit and once had a heater hose connected to it.... Link to comment Share on other sites More sharing options...
Colin Posted Saturday at 16:35 Author Report Share Posted Saturday at 16:35 Ah ha! 😃 Link to comment Share on other sites More sharing options...
Colin Lindsay Posted Sunday at 10:00 Report Share Posted Sunday at 10:00 23 hours ago, johny said: I believe it goes to the cooling circuit and once had a heater hose connected to it.... It's a sump plug alright, leads to the cooling system and cars like the mid-series TRs have a hose connected to it. You can buy a screw-in extension for the heater system that screws in here and will enable you to use a Smiths valve on the Delaney Gallay heater system. 1 Link to comment Share on other sites More sharing options...
Colin Posted Sunday at 11:31 Author Report Share Posted Sunday at 11:31 Thans Colin. Good info.. Mr. Dolphin said he had tried to remove a couple to see if they were indeed sump-compatible but had failed to remove either. Reckons if not fitted with other acoutrements, they must be sealed with some locking fluid or other! Would make sense, I guess, if they are basically an interference fit? I was going to purchase a couple for drilling & suitable magnet insertion as an experiment . . . Best, C. Link to comment Share on other sites More sharing options...
johny Posted Sunday at 11:40 Report Share Posted Sunday at 11:40 I think the idea was interference ie metal to metal so no sealant, tape or washers would be necessary. Of course that then means corrosion can really fix the plugs in place☹️ Link to comment Share on other sites More sharing options...
Colin Posted Sunday at 13:59 Author Report Share Posted Sunday at 13:59 Certainly one or the other!! Either way - he couldn't shift them! Best, C Link to comment Share on other sites More sharing options...
daverclasper Posted Sunday at 15:43 Report Share Posted Sunday at 15:43 Has anyone mentioned Blue Hylamar/Stag Wellseal as an easy to use sealant, if you already have some/ Link to comment Share on other sites More sharing options...
Colin Posted Sunday at 16:48 Author Report Share Posted Sunday at 16:48 If I was out of PTFE, blue hylomar is what I'd go with, Dave! Link to comment Share on other sites More sharing options...
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