<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><div><font face="sans-serif">Another thought. By chance did the compression rings on the plugs not get installed at the last service. That would change how far the plug penetrates the combustion chamber and might be just enough to cause an interference fit under certain conditions such as high RPM or higher engine temperatures.</font></div><div><br></div><div><br></div><div><br></div><div id="composer_signature"><div style="font-size:85%;color:#575757" dir="auto">Sent from my Verizon, Samsung Galaxy Tablet</div></div><div><br></div><div style="font-size:100%;color:#000000"><!-- originalMessage --><div>-------- Original message --------</div><div>From: craig.warner47346@frontier.com </div><div>Date: 11/29/19 9:32 PM (GMT-08:00) </div><div>To: Antique Tractor Email Discussion Group <at@lists.antique-tractor.com> </div><div>Subject: Re: [AT] Kinda Antique Tractor Question </div><div><br></div></div>
I don’t know a whole lot about the engine... not sure if it’s OHV or not.<br><br><br><a href="https://overview.mail.yahoo.com/?.src=iOS">Sent from Frontier Yahoo Mail for iPhone</a><br><br><p class="yahoo-quoted-begin" style="font-size: 15px; color: #715FFA; padding-top: 15px; margin-top: 0">On Friday, November 29, 2019, 8:17 PM, Phil Auten <pga2@basicisp.net> wrote:</p><blockquote class="iosymail"><div id="yiv5866834748"><div>
<p>The first thing that comes to mind is the piston contacting the
ground terminal of the plug. But if that were the case there would
be noise, I would think, and the starting would revert to terrible
quickly. Perhaps there is a piece of carbon floating around inside
the cylinder that occasionally gets pinched between the piston and
the plug? I just can't visualize anything else. If the head isn't
to difficult to get to you might pull it and check for something
like that. Is that a flathead or an OHV engine?</p>
<p>Phil in TX<br clear="none">
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<div class="yiv5866834748yqt3336402164" id="yiv5866834748yqtfd00808"><div class="yiv5866834748moz-cite-prefix">On 11/29/2019 6:11 PM,
<a rel="nofollow" shape="rect" class="yiv5866834748moz-txt-link-abbreviated" ymailto="mailto:craig.warner47346@frontier.com" target="_blank" href="mailto:craig.warner47346@frontier.com">craig.warner47346@frontier.com</a> wrote:<br clear="none">
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I’ve got a question that’s kinda antique tractor related
(depending on how you define antique.) I have a 1992 Ingersoll
6018 with an Onan 16hp motor. It usually starts and runs great.
Last few weeks it’s been terrible to start but then runs fine. I
pulled the plugs today and the gap was close to nothing in both of
them. Opened the gap to.030 and it fired right up. Why would the
plug gap close? I had issues with them this spring and set it at
that point.
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<div>Thanks,</div>
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<div>Craig</div></div>
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