<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><div><font face="sans-serif">It could be carbon floating around in the combustion chamber but also consider that when the engine warms up expansion might cause zero clearance between the ground side of the plug and the piston or valve. Check to see what are the recommended plugs vs what are currently installed. Also consider high RPM might play a role as well. </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">
</p>
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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>
<div><br clear="none">
</div>
<div>Craig</div></div>
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