Tazio Posted August 2, 2018 Share Posted August 2, 2018 Does anyone know the thread size for the oil pressure sender on a Xflow? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 2, 2018 Member Share Posted August 2, 2018 The various sizes and Roger King's comments.Jonathan Link to comment Share on other sites More sharing options...
Ian Macquarie Posted August 2, 2018 Share Posted August 2, 2018 Based on "normal" threads on a X/flow I would have expected it to be 1/4" NPT.However the VDO one fitted to my Caterham supplied X/flow in 1990 was 1/4" BSP (parrallel).The markings on the Hex are:-0-5 bar5.90 (I think that is the date)29/39 (I think a model / thread reference)Ian Link to comment Share on other sites More sharing options...
Tazio Posted August 3, 2018 Author Share Posted August 3, 2018 Cheers gents. Link to comment Share on other sites More sharing options...
Bricol Posted August 3, 2018 Share Posted August 3, 2018 1/4 NPT and BSP are close enough in thread form/angle to go together reasonably well - certainly brass into iron. I've managed to hold 25 Bar inside a system with such a combination.Above that things start to get a little more abusive. Link to comment Share on other sites More sharing options...
orangepeel61 Posted August 15, 2018 Share Posted August 15, 2018 Tazio, just come across your post, you're probably sorted by now but just in case:I have recently replaced my oil pressure sender with this:https://www.merlinmotorsport.co.uk/p/vdo-pressure-sender-5-bar-with-1-4npt-thread-360081029008My original one was marked:0-5 bar12.85 (date? Car is a 1987)29/39The new one is marked:0-5 bar5.1629/8No idea what these numbers mean but it fitted my crossflow and I now have oil pressure!Neil. Link to comment Share on other sites More sharing options...
Tazio Posted August 15, 2018 Author Share Posted August 15, 2018 Thanks Orangepeel, but I am replacing my current electrical gauge and sender with a mechanical gaug, I just trust them more. Link to comment Share on other sites More sharing options...
Roger King Posted August 15, 2018 Share Posted August 15, 2018 Just as an aside, the oil gallery threads in a Crossflow are indeed NPT of either 1/8" or 1/4". So obviously I always used 1/8" or 1/4" BSPT plugs - which leak!No, I'm not insane. The two threads are a reasonable(ish) match for each other, but the BSPT plugs normally have a much deeper and tighter fitting socket for your allen keys. You can almost guarantee that an NTP plug will strip its allen key socket if you try to remove it, thus necessitating drilling the plug out. This is not too much of a problem if you are stripping the engine down, but if you merely want to remove a plug in order to fit a sender it can be a disaster.The trick is to degrease and then smear the BSPT plug threads with a little Loctite thread sealant before assembly. I never had one leak once this was done, and the plugs would nearly always come out easily with an allen key, saving a lot of work and potential heartbreak.Just occasionally, a bodge is better than doing it properly! Of course, this won't apply to senders and other devices that have spanner flats. Link to comment Share on other sites More sharing options...
elie boone Posted August 18, 2018 Share Posted August 18, 2018 Or use a hex plug https://www.ridetech.com/components/compressor-system-components/fittings/1-8npt-plug/ Link to comment Share on other sites More sharing options...
Roger King Posted August 18, 2018 Share Posted August 18, 2018 That has some merit, but in one case at least, it won't work. The oil gallery that runs across the Crossflow block between cylinders 2 and 3 has a plug in one end, but the engine mounting fits over it when bolted in position. The Hex head would prevent the mounting from seating onto the block properly. Link to comment Share on other sites More sharing options...
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