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--></style></head><body lang=EN-US link=blue vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>After the comments I checked the measurement of the fitting. The pitch is 28 TPI and the major diameter at the top is 0.402” and 0.372” at the bottom. The measured taper is very close to the 16:1 for BSPT. These measurements fit very closely to a 1/8” BSPT except the measured major diameter is more than the 0.383” listed for BSPT.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The hole in the block is tapered as well. </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I will check the threads in the block to see if they are clean and in good shape. I am quite sure these are original parts, are there some other obsolete British tapered fittings slightly larger than BSPT? Whatever size this fitting is it won’t be easily replaced or repair and I will be very careful with it.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Harold<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b>From: </b><a href="mailto:m.g.sharp@sympatico.ca">m.g.sharp@sympatico.ca</a><br><b>Sent: </b>Sunday, May 29, 2022 8:14 AM<br><b>To: </b><a href="mailto:manifold@telus.net">Harold Manifold</a>; <a href="mailto:healeys@autox.team.net">Ken Fleming via Healeys</a><br><b>Subject: </b>RE: [Healeys] Union - oil gauge pipe</p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-CA>I am quite sure the thread into the block is straight, not tapered. The adaptor should screw up hard onto the copper washer. The thread may be bunged up with crud, so measure the thread on the adaptor and carefully run a tap down the hole in the block. If it starts cutting metal, I’d stop and figure it out, but I bet it will just clean up the threads and the adaptor will screw in.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA>Cheers, Mirek<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA> <o:p></o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Healeys <healeys-bounces@autox.team.net> <b>On Behalf Of </b>Harold Manifold<br><b>Sent:</b> May 28, 2022 9:51 PM<br><b>To:</b> Ken Fleming via Healeys <healeys@autox.team.net><br><b>Subject:</b> [Healeys] Union - oil gauge pipe<span lang=EN-CA><o:p></o:p></span></p></div></div><p class=MsoNormal><span lang=EN-CA> <o:p></o:p></span></p><p class=MsoNormal>Hello,<span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal> <span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal>I would like some clarification about the “Union - oil gauge pipe” before I over tighten and break something. Number 56 in the picture below. The threads going into the block are definitely tapered, however, the Union gets tight before sealing against the washer (No. 57). I don’t want to over tighten and damage the threads as I suspect the threads are not a standard size. I was thinking of using two copper washers and thread sealant.<span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal> <span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal>Any other suggestions?<span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal> <span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal><img border=0 width=288 height=265 style='width:3.0in;height:2.7604in' id="Picture_x0020_3" src="cid:image001.jpg@01D8734D.385E74A0"><span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal> <span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal>Harold<span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal> <span lang=EN-CA><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>