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<div> <font size="2">Harmonic damper?</font><br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Ken Knierim <ken.knierim@gmail.com><br>
To: Antique Tractor Email Discussion Group <at@lists.antique-tractor.com><br>
Sent: Mon, Apr 6, 2020 11:06 am<br>
Subject: Re: [AT] Kubota M5700 noise<br>
<br>
<div id="yiv2989465468">
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<div dir="ltr">Really reaching a bit here... I had a persistent rattling noise I chased in my Blazer. It made enough racket that the spark retard system would kick the timing back. Tried all kinds of things; kept thinking it was a rod or something. I finally got an engine to upgrade from the 305 to a 383 (stroker 350). When I tore it apart, I found the bolts on the torque converter to the flex plate had slipped and were rattling. Had to replace the flexplate to fix it but the noise sounded in the engine and wasn't.
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<div>Yours sounds like a particular cylinder from the video but is it possible there's something loose in the bell housing?</div>
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<div>Ken in AZ</div>
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<div class="yiv2989465468gmail_attr" dir="ltr">On Mon, Apr 6, 2020 at 10:40 AM Dave Maynard <<a rel="noopener noreferrer" shape="rect" ymailto="mailto:dave@themaplehillfarm.com" target="_blank" href="mailto:dave@themaplehillfarm.com">dave@themaplehillfarm.com</a>> wrote:<br clear="none"></div>
<blockquote class="yiv2989465468gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>Actually, did not check length of connecting rod and its clearance from head at TDC. But it's not traveling to close to the head as there would be damage showing. Just have this new concern about the wrong rod being put in by mistake, but that would have been short, not long.
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<div>Dave</div>
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<div class="yiv2989465468gmail_attr" dir="ltr">On Mon, Apr 6, 2020, 1:01 PM Mike M <<a rel="noopener noreferrer" shape="rect" ymailto="mailto:meulenms@gmx.com" target="_blank" href="mailto:meulenms@gmx.com">meulenms@gmx.com</a>> wrote:<br clear="none"></div>
<blockquote class="yiv2989465468gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>
When you had it apart, did you check all the piston,ring and bearing
clearances?<br clear="none">
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Mike M<br clear="none">
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<div>On 4/6/2020 11:35 AM, Dave Maynard
wrote:<br clear="none">
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<blockquote type="cite">
<div>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> 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> 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>
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<div>Dave</div>
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<div class="yiv2989465468gmail_attr" dir="ltr">On Mon, Apr 6, 2020, 9:08 AM
Cecil Bearden <<a rel="noopener noreferrer" shape="rect" ymailto="mailto:crbearden@copper.net" target="_blank" href="mailto:crbearden@copper.net">crbearden@copper.net</a>> wrote:<br clear="none">
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<blockquote class="yiv2989465468gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>
<div>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 clear="none">
Cecil<br clear="none">
</div>
<div>On 4/6/2020 1:12 AM, <a rel="noopener noreferrer" shape="rect" ymailto="mailto:k7jdj@aol.com" target="_blank" href="mailto:k7jdj@aol.com">k7jdj@aol.com</a>
wrote:<br clear="none">
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<blockquote type="cite">
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<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>
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<div><font size="2">Gary</font></div>
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<div><font size="2">Renton, WA.</font><br clear="none">
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<div style="font-family:arial, helvetica;font-size:10pt;color:black;">-----Original
Message-----<br clear="none">
From: Roger Moffat <a rel="noopener noreferrer" shape="rect" ymailto="mailto:rogerkiwi@gmail.com" target="_blank" href="mailto:rogerkiwi@gmail.com"><rogerkiwi@gmail.com></a><br clear="none">
To: Antique Tractor Email Discussion Group <a rel="noopener noreferrer" shape="rect" ymailto="mailto:at@lists.antique-tractor.com" target="_blank" href="mailto:at@lists.antique-tractor.com"><at@lists.antique-tractor.com></a><br clear="none">
Sent: Sun, Apr 5, 2020 7:43 pm<br clear="none">
Subject: Re: [AT] Kubota M5700 noise<br clear="none">
<br clear="none">
<div id="yiv2989465468gmail-m_5572200372103490139m_2085109996553918962m_-2421004768206050369yiv0933957868">
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<div id="yiv2989465468gmail-m_5572200372103490139m_2085109996553918962m_-2421004768206050369yiv0933957868yqtfd88006">
<div>On Apr 5, 2020, at 9:59 PM, Dave
Maynard <<a rel="noopener noreferrer" shape="rect" ymailto="mailto:dave@themaplehillfarm.com" target="_blank" href="mailto:dave@themaplehillfarm.com">dave@themaplehillfarm.com</a>>
wrote:</div>
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<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;">Have
cracked injector lines one at a time,
and it gets quieter on #5</span></div>
</div>
</blockquote>
</div>
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<div>But only on #5?</div>
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<div>When you crack the others the engine misses,
but the noise remains?</div>
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</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>
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</div>
<div>Eg #5 piston slightly higher than the other
4?</div>
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<div>Roger</div>
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