<div dir="auto">No sleeves in this engine. Someone had this engine apart before and #5 had a new piston and rod and bearings. The seller said it was his father's tractor since new and never been apart....he lied! There was more RTV on oil pan than you could imagine and obviously that piston and rod and bearings had been replaced and I thought they had been chasing the noise. Unless there was some other reason, but dont know. <div dir="auto"> My friend and mechanic help has a Jacobson mower he's is rebuilding that has a 4 cylinder version of this motor that appears identical except the number of cyl's. He found the rod to be the same except it a tweak shorter by an almost immeasurable amount, maybe .005 or .010. Part number is almost the same except last digit and now I'm wondering if that could be someone's mistake. Would shorter rod cause preignition? By the way, there is no part number on the rods so they would have to be accurately measured.</div><div dir="auto"> It's going to be a bit before I can get this back apart again, but hoping to have this fixed in time to plow.</div><div dir="auto"><br></div><div dir="auto">Dave</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 6, 2020, 9:08 AM Cecil Bearden <<a href="mailto:crbearden@copper.net">crbearden@copper.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>That was one of my thoughts, but my experience has been that the
liner movement was a double "thud" once on down stroke and once on
upstroke. <br>
Cecil<br>
</p>
<div>On 4/6/2020 1:12 AM, <a href="mailto:k7jdj@aol.com" target="_blank" rel="noreferrer">k7jdj@aol.com</a>
wrote:<br>
</div>
<blockquote type="cite">
<div style="color:black;font:10pt Arial,Helvetica,sans-serif">
<div> <font size="2">Cylinder liner loose. Don't know if this
engine even has cylinder liners if it does and that liner is
moving you would get click. Did you look carefully at the
head when you had it off and look for any sign of head
distress?</font></div>
<div><font size="2">I would do a compression check as well.</font></div>
<div><font size="2"><br>
</font></div>
<div><font size="2">Gary</font></div>
<div><font size="2"><br>
</font></div>
<div><font size="2">Renton, WA.</font><br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original
Message-----<br>
From: Roger Moffat <a href="mailto:rogerkiwi@gmail.com" target="_blank" rel="noreferrer"><rogerkiwi@gmail.com></a><br>
To: Antique Tractor Email Discussion Group
<a href="mailto:at@lists.antique-tractor.com" target="_blank" rel="noreferrer"><at@lists.antique-tractor.com></a><br>
Sent: Sun, Apr 5, 2020 7:43 pm<br>
Subject: Re: [AT] Kubota M5700 noise<br>
<br>
<div id="m_-2421004768206050369yiv0933957868">
<div><br clear="none">
<div><br clear="none">
<blockquote type="cite">
<div id="m_-2421004768206050369yiv0933957868yqtfd88006">
<div>On Apr 5, 2020, at 9:59
PM, Dave Maynard <<a rel="noopener noreferrer noreferrer" shape="rect" href="mailto:dave@themaplehillfarm.com" target="_blank">dave@themaplehillfarm.com</a>>
wrote:</div>
<br clear="none">
<div><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline!important">Have cracked injector lines one at
a time, and it gets quieter on #5</span></div>
</div>
</blockquote>
</div>
<br clear="none">
<div>But only on #5?</div>
<div><br clear="none">
</div>
<div>When you crack the others the
engine misses, but the noise remains?</div>
<div><br clear="none">
</div>
<div>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><br clear="none">
</div>
<div>Eg #5 piston slightly higher
than the other 4?</div>
<div><br clear="none">
</div>
<div>Roger</div>
</div>
</div>
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