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</head><body><p>I was wondering about a errant piston, too. Have struck once on an AC crawler engine.<br></p><p>Also came across an over length con rod once, how that was made was a bit of a mystery.<br></p><p>Have you thought about a compression test?<br></p><p>Tom<br></p><blockquote type="cite">On 06 April 2020 at 14:42 Roger Moffat <rogerkiwi@gmail.com> wrote: <br> <br> <br class=""><div><br class=""><blockquote type="cite"><div class="">On Apr 5, 2020, at 9:59 PM, Dave Maynard < <a href="mailto:dave@themaplehillfarm.com" class="">dave@themaplehillfarm.com</a>> wrote:</div><br class="ox-0a017db5fe-Apple-interchange-newline"><div class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-weight: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none; float: none; display: inline;" class="">Have cracked injector lines one at a time, and it gets quieter on #5</span></div></blockquote></div><br class=""><div class="">But only on #5?</div><div class=""><br class=""></div><div class="">When you crack the others the engine misses, but the noise remains?</div><div class=""><br class=""></div><div class="">I wonder if something about cylinder 5 is somehow different so that the compression is higher, and so it’s igniting (pre-igniting) too much before top dead centre in just that cylinder?</div><div class=""><br class=""></div><div class="">Eg #5 piston slightly higher than the other 4?</div><div class=""><br class=""></div><div class="">Roger</div></blockquote><p class="default-style"><br> </p><blockquote type="cite">_______________________________________________ <br>AT mailing list <br>AT@lists.antique-tractor.com <br>http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com <br></blockquote><p class="default-style"><br> </p></body></html>