<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Fred,<div>Engine exhaust heat and engine vibration will eventually loose almost anything. Heat is biggest problem due to metal expansion. That’s why it is recommended that head bolts be retightened after run in after a few heat cycles. Thinner jam nuts are made for double nutting for just this case. Only tighten what torque spec says. The spec tables will take into account material grade, # of threads/inch and bolt dia. Torque specs are available in a number of places. </div><div><br></div><div>Jerry Adams</div><div>BN 2<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Oct 17, 2019, at 12:24 PM, Bob Spidell <bspidell@comcast.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8"><div dir="ltr"><br><br><br>Begin forwarded message:<br><br></div><blockquote type="cite"><div dir="ltr"><b>From:</b> Bob Spidell <bspidell@comcast.net><br><b>Date:</b> October 17, 2019 at 8:21:17 AM PDT<br><b>To:</b> Fred Wescoe <fredwescoe@gmail.com><br><b>Subject:</b> <b>Re: [Healeys] Down pipes</b><br><br></div></blockquote><blockquote type="cite"><div dir="ltr"><span>I tried everything: new nuts, SS studs and torquing the snot out of the nuts (snapping a stud in the process) and still they would work loose. Finally gave up and double-nutted with mild steel nuts with high-temp anti-seize on the studs; they haven’t loosened since.</span><br><span></span><br><blockquote type="cite"><span>On Oct 16, 2019, at 6:19 PM, Fred Wescoe <fredwescoe@gmail.com> wrote:</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Listers,</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Today, I had to tighten the 6 nuts on my exhaust down pipes. This is the second time in 2 years I have had to do this. What is causing the nuts to work loose? Each of the 6 studs from the exhaust manifolds has split lock washers and brass nuts on the down pipe flanges. Each time time I have tightened the nuts, I tighten them until the nuts squeak.</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>What am I doing wrong and does anyone else have this issue? What do I need to do to fix this? The car is a 66 BJ8 with stock manifolds and down pipes.</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Thanks for any advice, I'm stumped,</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Fred</span><br></blockquote><blockquote type="cite"><span>66 BJ8</span><br></blockquote><blockquote type="cite"><span>_______________________________________________</span><br></blockquote><blockquote type="cite"><span>Support Team.Net http://www.team.net/donate.html</span><br></blockquote><blockquote type="cite"><span>Suggested annual donation $12.75</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Healeys@autox.team.net</span><br></blockquote><blockquote type="cite"><span>http://autox.team.net/mailman/listinfo/healeys</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/bspidell@comcast.net</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote></div></blockquote><span>_______________________________________________</span><br><span>Support Team.Net http://www.team.net/donate.html</span><br><span>Suggested annual donation $12.75</span><br><span></span><br><span>Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive</span><br><span></span><br><span>Healeys@autox.team.net</span><br><span>http://autox.team.net/mailman/listinfo/healeys</span><br><span></span><br><span>Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/cjerryadams@yahoo.com</span><br><span></span><br></div></blockquote></div></body></html>