chrishawley Posted July 15, 2021 Report Share Posted July 15, 2021 GT6 with 2500 big box. Recon box installed and very nice it is too. Except it's weeping fluid from the drain plug. It's in very tight and I'm wondering what the remedy might be. Does it 'look right' to you? Is a possibility that a BSPP plug has been persuaded into what is meant to be 3/8 (18) NP thread? Is it appropriate to use either PTFE tape or a sealant (e.g Hylomar) when refitting? Any suggestions would be much appreciated. My current idea is to remove the current plug and replace with a (known good) NOS 3/8 NP plug with a little Hylomar but I'd happily be advised otherwise. Thanks in advance C Link to comment Share on other sites More sharing options...
Ian Faulds Posted July 15, 2021 Report Share Posted July 15, 2021 Doesn't look right to me, it's not in far enough, don't force it, you'll need to take it out and check the threads. Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 15, 2021 Report Share Posted July 15, 2021 agree looks a bit crossed Pete 1 Link to comment Share on other sites More sharing options...
Badwolf Posted July 15, 2021 Report Share Posted July 15, 2021 ..and I thought that mine was off center and a perculiar shape!! Link to comment Share on other sites More sharing options...
Nigel Clark Posted July 16, 2021 Report Share Posted July 16, 2021 11 hours ago, Pete Lewis said: agree looks a bit crossed Pete Agree thread looks crossed. I would take the plug out, check and clean the thread then try fitting a brand new plug. Can you take it back to the reconditioner and ask them to sort it? Nigel Link to comment Share on other sites More sharing options...
Nick Jones Posted July 16, 2021 Report Share Posted July 16, 2021 They usually have a magnetic plug with a 3/4” hex head. Though as already observed, that looks more like a case of cross threading. Nick Link to comment Share on other sites More sharing options...
Mjit Posted July 16, 2021 Report Share Posted July 16, 2021 I've used PTFE tape on both engine and gearbox sump plugs that weeped without any issues. Doesn't actually need a huge knock to make the hold fractionally out of round. Not enough to stop the plug screwing freely in/out but enough to give some oil molecules are route to freedom. Link to comment Share on other sites More sharing options...
68vitesse Posted July 16, 2021 Report Share Posted July 16, 2021 As I understand it should be ⅜NPTF Which was designed to give a dry fluid tight joint, not NPT which is not fluid tight, I have used Loctite55 when I made this mistake. Regards Paul Link to comment Share on other sites More sharing options...
chrishawley Posted July 16, 2021 Author Report Share Posted July 16, 2021 Ok. I'll proceed on the basis that a the female thread is recoverable and a new NPTF plug will produce a most satisfactory result. If the thread is mullered then I may well be back for further thoughts. Thanks C Link to comment Share on other sites More sharing options...
chrishawley Posted July 27, 2021 Author Report Share Posted July 27, 2021 Problem resolved. Removed plug and there wasn't any significant deformation of either the male or female portions. New plug fitted with PTFE. Now no leak. Thanks C Link to comment Share on other sites More sharing options...
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