<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Jon,</div><div>I read in a de-classified publication, " Rotary shaft seal selection handbook</div><div>for pressure equalised deep ocean equipment", that a sacrificial seal is </div><div>sometimes used in underwater applications.</div><div>This seal will see the salt water & crut that is forced passed it by the propeller,</div><div>& wear first.</div><div>Alan</div><div><br></div><div><br></div><div><br></div><div><br>On 15/08/2018, at 1:57 AM, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1534254315208_2680"><br></div><div id="yui_3_16_0_ym19_1_1534254315208_2680">FYI, I ordered new seals and a brass bushing direct from Minn Kota which turned out to be the best pricing for the items that I could find on the Internet.</div><div id="yui_3_16_0_ym19_1_1534254315208_2680"><br></div><div id="yui_3_16_0_ym19_1_1534254315208_2680" dir="ltr">A while back we had a discussion about the two seals on Minn Kota's...are both necessary, what about the space between them and pressure considerations, etc, etc, etc. In my case, I considered installing just one seal but chickened out and installed both. I'm convinced the purpose of two seals is simply to back each other up in case one fails. I had lost the cardboard spacer that separates the two seals, so after installing the first one I packed the void within it (it's a lip seal) with grease and then just pushed the second one directly beside the first with no spacer. </div><div id="yui_3_16_0_ym19_1_1534254315208_2680" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1534254315208_2680" dir="ltr">The seals are numbered 21 in the attached diagram.</div><div id="yui_3_16_0_ym19_1_1534254315208_2680" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1534254315208_2680" dir="ltr">Jon</div></div></div></blockquote><blockquote type="cite"><div><101seals.JPG></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>