Mac Bowden Posted January 16, 2014 Report Share Posted January 16, 2014 I managed to source the 1/8 npt male to male fitting and everything fits O.K. I've had 3 pressure sensors go faulty this last 3 years now it'll be interesting to see how long this new one lasts away from the engine vibration. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted January 16, 2014 Author Report Share Posted January 16, 2014 Mac, here's mine. The top connection in the picture is the sender connection. Blue high pressure hose secured to NPT fitting with stainless oetiker clamp, covered with orange firesleeve. This is all the hardware supplied by Lockwood Aviation in their firewall relocation kit. Link to comment Share on other sites More sharing options...
FredG Posted January 16, 2014 Report Share Posted January 16, 2014 Is there a concern with production changes in the thread size on the 912 engine oil pump fitting? Weren't the threads originally NPT and then changed to metric at some point? It may be worth checking since I think the two threads are similar in appearance and may not be obviously different at first glance. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted January 16, 2014 Author Report Share Posted January 16, 2014 Is there a concern with production changes in the thread size on the 912 engine oil pump fitting? Weren't the threads originally NPT and then changed to metric at some point? It may be worth checking since I think the two threads are similar in appearance and may not be obviously different at first glance. I thought Roger said that this fitting is one of the few NPT fittings on the 912 series. Link to comment Share on other sites More sharing options...
mocfly Posted January 18, 2014 Report Share Posted January 18, 2014 Andy, If you get a chance the end of the firesleeve should be sealed. Here is a good source www.firesleeveandtape.com. Link to comment Share on other sites More sharing options...
Roger Lee Posted January 19, 2014 Report Share Posted January 19, 2014 It depends on the year, but most of ours (older) at this connection are 1/8" X 27 NPT. American tapered thread. Link to comment Share on other sites More sharing options...
Mac Bowden Posted January 19, 2014 Report Share Posted January 19, 2014 Andy, thanks for the photo. I agree with Roger that the thread is 1/8 NPT taper. The sender is now on the firewall beside the battery and hope it has a longer life than it's predecessors. I wired the outer casing to engine earth and it works fine. Link to comment Share on other sites More sharing options...
Roger Lee Posted January 19, 2014 Report Share Posted January 19, 2014 When remote mounting you have two choices of senders. You can keep your single pole sender, but then need to ground the sender case to the battery or the engine/frame or buy a two pole sender and use that second pol;e for the ground connection. Either way works. Link to comment Share on other sites More sharing options...
FredG Posted January 19, 2014 Report Share Posted January 19, 2014 The point of my prior post was that Rotax changed from NPT to M10 thread for the oil pressure sensor port on the 912 series engine (in the past year or two, I believe). This makes for some uncertainty in thread sizes that has resulted in grief for some owners (either those with older engines installing new senders or those with newer engines installing common relocation kits or older sensors with NPT threads). My only point is to check all fittings before installing anything. There are now two sizes in use when there used to be just one. (My comments are for entertainment purposes only and are not intended to substitute for factory documentation nor for standard maintenance practice). Link to comment Share on other sites More sharing options...
Roger Lee Posted January 19, 2014 Report Share Posted January 19, 2014 The newer engines do have a different thread, but the engine in the last 2 years for CT's have had many already on the fire wall. I do not know exactly where the serial number for the thread change is, but if you had a different thread then just buy a different nipple when you discover the change. Most of us wanting to do the change have older engines and not a new one. Link to comment Share on other sites More sharing options...
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