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<div dir="ltr" data-setdir="false">Correct Perry. I was confusing the fine thread count of a BSF thread to a UNF thread. I just can't get away with anything with you guys. Thankfully.</div><div dir="ltr" data-setdir="false">Mike MacLean<br></div><div><br></div>
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On Sunday, May 10, 2020, 11:41:21 AM PDT, Perry <healeyguy@aol.com> wrote:
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#yiv4621312562 </style><div><div class="yiv4621312562WordSection1"><p class="yiv4621312562MsoNormal">OK I got confused on this exchanged. Regarding the UNF threads, my info shows the 3/8 (major diameter) UNF bolt as having 24 threads per inch. The exchange mentioned 20 TPI</p><p class="yiv4621312562MsoNormal">Perry</p><p class="yiv4621312562MsoNormal"> </p><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;"><div class="yiv4621312562yqt0788660123" id="yiv4621312562yqtfd05002"><p class="yiv4621312562MsoNormal" style="border:none;padding:0in;"><b>From: </b><a rel="nofollow" shape="rect" ymailto="mailto:michaelsalter@gmail.com" target="_blank" href="mailto:michaelsalter@gmail.com">Michael Salter</a><br clear="none"><b>Subject: </b>Re: [Healeys] Motor Mout Bolts</p></div></div><div class="yiv4621312562yqt0788660123" id="yiv4621312562yqtfd98535"><p class="yiv4621312562MsoNormal"> </p><div><div><p class="yiv4621312562MsoNormal"><b><i><span style="font-size:12.0pt;">"So, now I can run a 3/8 - 20 UNF tap through the hole to clean it up. So, I take it all threaded holes in the engine bay are UNF."</span></i></b><span style="font-size:12.0pt;"></span></p></div><div><p class="yiv4621312562MsoNormal"><span style="font-size:12.0pt;">I think that may be a stretch Mike ... I know, for example, that the nuts welded into the frame for the battery hold down rods changed from BSF to UNF as C.#156839. I would bet that there are other instances of this.</span></p></div><div><p class="yiv4621312562MsoNormal"><span style="font-size:12.0pt;">I would always recommend checking your parts book for the correct thread for your car before running a tap through any.</span></p></div><div><p class="yiv4621312562MsoNormal"><span style="font-size:12.0pt;"> </span></p></div><div><p class="yiv4621312562MsoNormal"><span style="font-size:12.0pt;">M</span></p></div></div><p class="yiv4621312562MsoNormal"> </p><div><div><p class="yiv4621312562MsoNormal">On Sun, May 10, 2020 at 12:50 PM Michael MacLean <<a rel="nofollow" shape="rect" ymailto="mailto:rrengineer.mike@att.net" target="_blank" href="mailto:rrengineer.mike@att.net">rrengineer.mike@att.net</a>> wrote:</p></div><blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in;"><p class="yiv4621312562MsoNormal">The only reason I asked this question in the first place was because a 3/8" UNF bolt screwed into all eight holes for a few threads and stopped. Because it was the same in all eight holes I did not want to force it. So, now I can run a 3/8 - 20 UNF tap through the hole to clean it up. So, I take it all threaded holes in the engine bay are UNF. Certainly simplifies it.</p><div id="yiv4621312562gmail-m_-5974905000147687713yMail_cursorElementTracker_1589129381257"><p class="yiv4621312562MsoNormal" style="margin-bottom:12.0pt;">Mike MacLean</p><blockquote style="margin-left:0in;margin-right:0in;margin-bottom:15.0pt;"><div><div><p class="yiv4621312562MsoNormal"><span style="">On Sun, May 10, 2020 at 8:51 AM, Curtis Arndt</span></p></div><div><p class="yiv4621312562MsoNormal"><span style=""><<a rel="nofollow" shape="rect" ymailto="mailto:cnaarndt@gmail.com" target="_blank" href="mailto:cnaarndt@gmail.com">cnaarndt@gmail.com</a>> wrote:</span></p></div></div><div style="border:none;border-left:solid #6D00F6 1.0pt;padding:0in 0in 0in 15.0pt;margin-top:7.5pt;"><div id="yiv4621312562gmail-m_-5974905000147687713yiv7438463404"><div><p class="yiv4621312562MsoNormal">They are UNF on my BN1 built 11 Jan. '55. If they ever were BSF, it was very early in BN1 production. </p></div><p class="yiv4621312562MsoNormal"> </p><div><div><p class="yiv4621312562MsoNormal">On Sat, May 9, 2020, 16:54 Perry via Healeys <<a rel="nofollow" shape="rect" ymailto="mailto:healeys@autox.team.net" target="_blank" href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:</p></div><blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in;"><div><div><p>Michael</p><p>There was a slow switch from BSF to UNF fasteners used and threads on some parts starting about mid 1954 through the end of 1955 at several locations on the 100. However I can not speak to the engine mount to chassis fasteners. </p><p>Its one of those areas of the car that if I ended up with damage to the welded nut threads that could not be cleaned up with a tap I would do what was necessary to secure the engine mount short of replacing the welded nut. </p><p>Perry</p><p> </p><div style="border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:currentcolor currentcolor;"><p><b>From: </b><a rel="nofollow" shape="rect" ymailto="mailto:rrengineer.mike@att.net" target="_blank" href="mailto:rrengineer.mike@att.net">Michael MacLean</a><br clear="none"><br clear="none"></p></div><p> </p><p>Are the bolts that fasten the motor mounts to the frame different threads between the BN1 and the BN2?</p><div id="yiv4621312562gmail-m_-5974905000147687713yiv7438463404m_8389926694834509769yMail_cursorElementTracker_1589058832618"><p style="margin-bottom:12.0pt;">Mike MacLean</p></div></div></div></blockquote></div></div></div></blockquote></div></blockquote></div><p class="yiv4621312562MsoNormal"> </p></div></div></div></div></div>
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