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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'>Isn’t that going to be a pipe thread? I would guess it to be 1/8” NPT (tapered) or 1/8” BSPT (straight). Just get a pipe plug of the correct thread size. There is no bolt thread that will match up as far as I know. Since the threads are making the seal, use some Teflon tape and/or thread sealant like RectorSeal or Permatex.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'>Alex Thomson<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Triumphs [mailto:triumphs-bounces@autox.team.net] <b>On Behalf Of </b>dave northrup<br><b>Sent:</b> Saturday, February 12, 2022 1:39 PM<br><b>To:</b> triumphs@autox.team.net<br><b>Subject:</b> [TR] TR6 engine block<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>When I bought the car (1972 TR6) in 2001, a friend suggested that I replace the oil pressure warning sensor in the block. It just failed at the joint between the metal and the plastic. Fortunately, being a pack rat, I still have the original sensor which I put back in. it looks to be of much higher quality, although I guess I shouldn’t complain about 20 years of service.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I suspect the one I just put back in is the original sensor and survived the first 30 years without trouble. I thought about carrying a spare – this failure would have been catastrophic as quite a bit of oil was leaking out, not to mention the mess it made of the exhaust and the undercarriage. Then I figured I could just carry a small bolt with a copper washer. Given the car has an oil pressure gage which I think would flag this disaster much sooner, plus the copious amount of oil underneath would have alerted me, as it did this time. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Does anyone know how far into the block this hole goes? What is down there and how short a bolt do I have to use?<o:p></o:p></p></div></body></html>