2009poolesparky Posted February 3, 2016 Share Posted February 3, 2016 Good morning everyoneI am going to be changing the oils on my car soon. The engine, box and diff.I have all the oils and filters already, but I can see the engine and box sump plugs are the original square head ones, without magnets. There are lots to choose from online, varying in price also, but off hand does anyone know what length thread size and pitch it needs to be so I can find a magnetic replacement.ThanksAlex Quote Link to comment Share on other sites More sharing options...
john2502 Posted February 3, 2016 Share Posted February 3, 2016 Always a good idea. Got my engine one from Canleys for the GT6. Can't help with dimensions I'm afraid but seemed a nice well made item at a good price.http://www.canleyclassics.com/engine/magnetic-drain-plug Quote Link to comment Share on other sites More sharing options...
yorkshire_spam Posted February 3, 2016 Share Posted February 3, 2016 I'd guess it's a tapered BSP thread, but don't know for sure. Quote Link to comment Share on other sites More sharing options...
yorkshire_spam Posted February 3, 2016 Share Posted February 3, 2016 Although a quick search suggests they may be NPT? So ignore my guesses! Quote Link to comment Share on other sites More sharing options...
andy thompson Posted February 3, 2016 Share Posted February 3, 2016 Hole thread is standard 3/8 BSP Plug is 3/8 BSP Taper Quote Link to comment Share on other sites More sharing options...
Jonny-Jimbo Posted February 3, 2016 Share Posted February 3, 2016 Would that explain why they always leak haha. Quote Link to comment Share on other sites More sharing options...
nang Posted February 3, 2016 Share Posted February 3, 2016 Sorry to contradict but plugs are 3/8" NPT 18 TPI. Not too much difference but BSP is 19 TPI.Tony. Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted February 3, 2016 Share Posted February 3, 2016 Got my engine/ gearbox & diff sump plug from James Paddock 🙂 Quote Link to comment Share on other sites More sharing options...
Jonny-Jimbo Posted February 4, 2016 Share Posted February 4, 2016 I have heard BSPT before, but I can't say for certain. Quote Link to comment Share on other sites More sharing options...
nang Posted February 6, 2016 Share Posted February 6, 2016 Quoted from Spitfire6 Hi, that might explain why they are a * to remove sometimes as well?So NPT? BSPT, BSPP? 18TPI? 19TPI? what size are they for sure?I'm only guessing when I say American NPT.Cheers,Iain. OK a definitive size for you all......found one of my mutilated, square headed plugs today which I thought I'd tossed out.....definately 18 TPI so definately NPT. (naughty)Tony. Quote Link to comment Share on other sites More sharing options...
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