Hall/RPM Sensor Oil Leak - Zenith Aircraft Builders and Flyers2024-03-29T10:53:50Zhttps://zenith.aero/forum/topics/hall-rpm-sensor-oil-leak?commentId=2606393%3AComment%3A736485&feed=yes&xn_auth=noStill no joy after using 2mm…tag:zenith.aero,2023-09-05:2606393:Comment:9119422023-09-05T17:07:23.994ZJohn Bellhttps://zenith.aero/profile/JohnBell
<p>Still no joy after using 2mm o rings with silicone. Really don’t understand it. The bores are a wee bit larger than spec (21.69mm) but the 2mm O ring should compensate. <br/>anybody have some advice other than replacing the backing plate?</p>
<p>Still no joy after using 2mm o rings with silicone. Really don’t understand it. The bores are a wee bit larger than spec (21.69mm) but the 2mm O ring should compensate. <br/>anybody have some advice other than replacing the backing plate?</p> How did you get the 2mm ones…tag:zenith.aero,2023-07-31:2606393:Comment:9101562023-07-31T14:21:39.373ZJohn Bellhttps://zenith.aero/profile/JohnBell
<p>How did you get the 2mm ones in? </p>
<p>How did you get the 2mm ones in? </p> Hey Eric, are your O rings st…tag:zenith.aero,2023-07-20:2606393:Comment:9091232023-07-20T18:44:14.844ZJohn Bellhttps://zenith.aero/profile/JohnBell
<p>Hey Eric, are your O rings still good? Did you end up having to use some RTV?</p>
<p>Hey Eric, are your O rings still good? Did you end up having to use some RTV?</p> I tried the black RTV, once u…tag:zenith.aero,2023-07-19:2606393:Comment:9092362023-07-19T20:31:13.725ZJohn Bellhttps://zenith.aero/profile/JohnBell
<p>I tried the black RTV, once using a little (no luck) and again with more effectively adding a gasket to the beveled area of the bore and the sensor. The silicon seemed a bit grainy even from a fresh tube so the next time I used the copper with same results. I’ve used new 1.78mm O rings each time.</p>
<p>May try it again with the grey silicone (a little smoother?). If that doesn’t work I’ll try the 2mm O rings before I resort to siliconing the whole recessed sensor area of the backer plate.…</p>
<p>I tried the black RTV, once using a little (no luck) and again with more effectively adding a gasket to the beveled area of the bore and the sensor. The silicon seemed a bit grainy even from a fresh tube so the next time I used the copper with same results. I’ve used new 1.78mm O rings each time.</p>
<p>May try it again with the grey silicone (a little smoother?). If that doesn’t work I’ll try the 2mm O rings before I resort to siliconing the whole recessed sensor area of the backer plate. That’s what UL is suggesting I try,</p> Yes, I little bit. I also di…tag:zenith.aero,2023-07-19:2606393:Comment:9092702023-07-19T17:16:48.625ZScott Millerhttps://zenith.aero/profile/ScottMiller
<p>Yes, I little bit. I also discovered that I had a 2nd smashed "O" Ring on it that was not letting it seal properly. Once I cleaned them up and installed the new "O" rings I haven't had any leaks at all...</p>
<p>Yes, I little bit. I also discovered that I had a 2nd smashed "O" Ring on it that was not letting it seal properly. Once I cleaned them up and installed the new "O" rings I haven't had any leaks at all...</p> Did you use RTV on the larger…tag:zenith.aero,2023-07-19:2606393:Comment:9092662023-07-19T13:48:03.701ZJohn Bellhttps://zenith.aero/profile/JohnBell
<p>Did you use RTV on the larger O rings or just bare?</p>
<p>Did you use RTV on the larger O rings or just bare?</p> I’ve tried to fix this leak w…tag:zenith.aero,2023-07-19:2606393:Comment:9092632023-07-19T13:46:32.821ZJohn Bellhttps://zenith.aero/profile/JohnBell
<p>I’ve tried to fix this leak with the 11/16” x 1.78 O rings 4 times now using Ultra black or Ultra Copper silicone. I get the same amount leaking every time. It’s enough to wet the engine mount and spray back to the firewall after a 20 minute flight. Even taped off the sensors to be sure it wasn’t coming from somewhere else. The Company has been chatting with me and can’t figure it out either. Sent me new sensors but no improvement. Talking about replacing the backing plate. The first 40…</p>
<p>I’ve tried to fix this leak with the 11/16” x 1.78 O rings 4 times now using Ultra black or Ultra Copper silicone. I get the same amount leaking every time. It’s enough to wet the engine mount and spray back to the firewall after a 20 minute flight. Even taped off the sensors to be sure it wasn’t coming from somewhere else. The Company has been chatting with me and can’t figure it out either. Sent me new sensors but no improvement. Talking about replacing the backing plate. The first 40 hours was dry as a bone. I’ve tried a little RTV on the O rings alone and adding more to squeeze between the sensor flange and backer plate, no improvement. Sealed around the sensor anchor studs that didn’t appear to be leaking anyway, no change. No indication of a crack in the backer plate.<br/>Am I missing something here? Ray Lawrence is also scratching his head.</p> Finding indications of small…tag:zenith.aero,2021-10-13:2606393:Comment:8499322021-10-13T20:17:56.336ZRalph Powellhttps://zenith.aero/profile/RalphPowell
<p>Finding indications of small oil leak in my engine compartment. Where/how did you notice the leak from the Hall sensors? I mounted a tool box behind my engine and it gathers a light sheen of oil after about an hour of flight. My breather hoses have oil on them, but I cannot see how they could leak. I am not seeing any oil around the sensors.</p>
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<p>Replaced my front crank seal. Found a “nick” on the crank. Shipping engines, even in original create is a rough endeavor. Smoothed it out…</p>
<p>Finding indications of small oil leak in my engine compartment. Where/how did you notice the leak from the Hall sensors? I mounted a tool box behind my engine and it gathers a light sheen of oil after about an hour of flight. My breather hoses have oil on them, but I cannot see how they could leak. I am not seeing any oil around the sensors.</p>
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<p>Replaced my front crank seal. Found a “nick” on the crank. Shipping engines, even in original create is a rough endeavor. Smoothed it out and so far, about 5 hours, it has not started leaking again. This leak may have hidden rear engine leak.</p>
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<p>Ralph</p>
<p>N750RP</p>
<p>208 680-2561</p> O-ring update. After about 30…tag:zenith.aero,2021-09-08:2606393:Comment:8463932021-09-08T01:45:45.485ZEric Johnsonhttps://zenith.aero/profile/EricJohnson97
<p>O-ring update. After about 30 hours the larger size O-rings that I used (mentioned in an earlier message) started seeping again. Not badly, but zero leaks is nice. This time I used slightly larger 17mm X 2mm O-rings from the same kit. The sensors were a little harder to push in, but so far so good. If they leak again I will use RTV on them.</p>
<p>O-ring update. After about 30 hours the larger size O-rings that I used (mentioned in an earlier message) started seeping again. Not badly, but zero leaks is nice. This time I used slightly larger 17mm X 2mm O-rings from the same kit. The sensors were a little harder to push in, but so far so good. If they leak again I will use RTV on them.</p> Me too. Got the new o rings…tag:zenith.aero,2021-08-02:2606393:Comment:8432462021-08-02T13:03:27.263ZFred Williamshttps://zenith.aero/profile/FredWilliams
<p>Me too. Got the new o rings from Wicks and put some red rtv around them and the area is now dry. </p>
<p>Me too. Got the new o rings from Wicks and put some red rtv around them and the area is now dry. </p>