Iain T Posted June 19, 2023 Report Share Posted June 19, 2023 (edited) I seem to have developed a small weep from the sump plug. It's not bad just annoying. When I change the oil next can i use something like Permatex 59214 thread sealant to seal? The plug is a correct taper thread magnetic type. I'm not happy tightening any further as I don't want to crack the boss to oil pan welding. Iain Edited June 19, 2023 by Iain T Link to comment Share on other sites More sharing options...
Paul H Posted June 19, 2023 Report Share Posted June 19, 2023 1 minute ago, Iain T said: I seem to have developed a small weep from the sump plug. It's not bad just annoying. When I change the oil next can i use something like Permatex thread sealant to seal? The plug is a correct taper thread magnetic type. I'm not happy tightening any further as I don't want to crack the boss to oil pan welding. Iain I had the same issue and reverted back to the tapered plug Paul Link to comment Share on other sites More sharing options...
Iain T Posted June 19, 2023 Author Report Share Posted June 19, 2023 (edited) It is a new 'Gold' taper plug. The one that came with the car was very loose and felt like a straight thread with copper washer. I believe the thread should be tapered? Iain Edited June 19, 2023 by Iain T Link to comment Share on other sites More sharing options...
Wagger Posted June 19, 2023 Report Share Posted June 19, 2023 If you have time, drain the oil out, leave overnight, then tip the car so that the bung is not the lowest point. Dry the thread thoroughly, maybe wash in petrol first, then generously cover your new tapered plug in Hylomar and refit it. Refill with oil. That has always worked for me except when the sump exit had been cracked by a gorilla. Link to comment Share on other sites More sharing options...
Iain T Posted June 19, 2023 Author Report Share Posted June 19, 2023 24 minutes ago, Wagger said: generously cover your new tapered plug in Hylomar and refit it. I thought Hylomar was a gasket sealant and not suitable for threads? Iain Link to comment Share on other sites More sharing options...
KevinR Posted June 19, 2023 Report Share Posted June 19, 2023 It is possible that you have the wrong thread on the new "gold" taper plug. Lots of traders make the same mistake and sell the wrong plug. Small Chassis triumph cars use a 3/8" NPT (or possibly NPTF) threaded sump plug. Other cars use a 3/8" BSPT threaded sump plug. The two are NOT compatible - use the wrong one and you will get a leak. https://wavelen.com/2018/03/15/painful-lesson-of-the-day-npt-vs-bspt/ Also, it is ONLY the threads of the PLUG that are Tapered. The thread of the fitting in the sump is NOT tapered. Link to comment Share on other sites More sharing options...
68vitesse Posted June 19, 2023 Report Share Posted June 19, 2023 According to my WSM it is a dryseal thread which I believe is NPTF the F standing for fuel and is designed to seal without any sealant. NPT has same pitch and thread angle but will not seal as thread is cut differently. Regards Paul Link to comment Share on other sites More sharing options...
Iain T Posted June 20, 2023 Author Report Share Posted June 20, 2023 (edited) 10 hours ago, KevinR said: Small Chassis triumph cars use a 3/8" NPT (or possibly NPTF) threaded sump plug. The paperwork and packaging definitely said 3/8 npt. The manufacturer Gold make lots of sump plugs. I did check it was tapered but had to trust it was the right thread. As I said the one that came with the car wasn't a taper thread so rattled around and used a copper washer to seal. That weeped as well. So it's either crud in the thread or as you say they put the wrong plug in the packet. The oil has only been in for less than 500 miles but I might be able to drain it into a clean bowl. As to the plug??? Iain Edited June 20, 2023 by Iain T Link to comment Share on other sites More sharing options...
Mjit Posted June 20, 2023 Report Share Posted June 20, 2023 I'm not sure you'd want to use a thread sealent on a sump plug, sounds like you'd just be making your next oil change harder! If it's just a slight weep I'd try wrapping the plug with a few loops of PTFE tape and refitting it. PTFE tape is a thread lubricant so lets you tighten the plug more than it is now but using less force than you already have, so it goes in tighter but with less risk of damaging the sump. Link to comment Share on other sites More sharing options...
Chris A Posted June 20, 2023 Report Share Posted June 20, 2023 30 minutes ago, Mjit said: If it's just a slight weep That is a Triumph design feature to protect the chassis from rust 😉, Link to comment Share on other sites More sharing options...
Iain T Posted June 20, 2023 Author Report Share Posted June 20, 2023 15 minutes ago, Chris A said: That is a Triumph design feature to protect the chassis from rust 😉, It's not the only leak the chassis will still be rusrproofed! I only found the issue as I was tidying up and cleaned the catch tray then saw a few spots on my next inspection. Iain Link to comment Share on other sites More sharing options...
Wagger Posted June 20, 2023 Report Share Posted June 20, 2023 13 hours ago, Iain T said: I thought Hylomar was a gasket sealant and not suitable for threads? Iain It won't stick it solid like Loctite and is usd for gaskets against oil. It will allow you to remove the plug in future too. Link to comment Share on other sites More sharing options...
dannyb Posted June 20, 2023 Report Share Posted June 20, 2023 Some ptfe tape will do it. I would jack up the car that side as high as I could to get the sump plug out without loosing to much oil. Danny Link to comment Share on other sites More sharing options...
Gully Posted June 20, 2023 Report Share Posted June 20, 2023 The tapered sump plug on mine has some hemp on it to assist - been there for at least 10 years and numerous oil changes without a leak. Gully Link to comment Share on other sites More sharing options...
Iain T Posted June 20, 2023 Author Report Share Posted June 20, 2023 19 minutes ago, dannyb said: would jack up the car that side as high as I could to get the sump plug out without loosing to much oil. Good suggestion! Ta Link to comment Share on other sites More sharing options...
PeteH Posted June 20, 2023 Report Share Posted June 20, 2023 1 hour ago, Gully said: The tapered sump plug on mine has some hemp on it to assist - been there for at least 10 years and numerous oil changes without a leak. Gully Now there’s a blast from the past, until, and even after, the introduction of ptfe tape, the old pipe fitters used nothing else but hemp and white lead paste “boss white” was a staple on ship engine store orders. I still have a tin in the garage? Pete Link to comment Share on other sites More sharing options...
Iain T Posted June 20, 2023 Author Report Share Posted June 20, 2023 23 minutes ago, PeteH said: white lead paste “boss white” Every home used to have a tin. You can still buy it but without all the nasty stuff that probably made it work better! Iain 1 Link to comment Share on other sites More sharing options...
Iain T Posted June 20, 2023 Author Report Share Posted June 20, 2023 2 hours ago, Wagger said: It won't stick it solid like Loctite and is usd for gaskets against oil. It will allow you to remove the plug in future too. The Permatex thread sealant is I believe non hardening, I suppose a bit like Wellseal, so you can disassemble. Iain Link to comment Share on other sites More sharing options...
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