<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"><head><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><body><div class="ydpd700a39ayahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div></div>
<div dir="ltr" data-setdir="false">A Google search for <span>kubota M5700 engine noise </span> turns up a thread on tractorbytenet about a tractor in new york with exactly the same problem. Knock piston 5. You might follow this thread to see if there was a solution <br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><a href="https://www.tractorbynet.com/forums/kubota-owning-operating/413832-m5700-knock-other-questions.html" rel="nofollow" target="_blank" fg_scanned="1" class="enhancr_card_6504166733">M5700 'Knock' and other questions</a></div><div><br></div><div id="ydp83a9d15eenhancr_card_6504166733" class="ydp83a9d15eyahoo-link-enhancr-card ydp83a9d15eyahoo-link-enhancr-not-allow-cover ydp83a9d15eymail-preserve-class ydp83a9d15eymail-preserve-style" style="max-width:400px;font-family:Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif" data-url="https://www.tractorbynet.com/forums/kubota-owning-operating/413832-m5700-knock-other-questions.html" data-type="YENHANCER" data-size="MEDIUM" contenteditable="false"><a href="https://www.tractorbynet.com/forums/kubota-owning-operating/413832-m5700-knock-other-questions.html" style="text-decoration-line: none !important; text-decoration-style: solid !important; text-decoration-color: currentcolor !important; color: rgb(0, 0, 0) !important;" class="ydp83a9d15eyahoo-enhancr-cardlink" rel="nofollow" target="_blank"><table class="ydp83a9d15ecard-wrapper ydp83a9d15eyahoo-ignore-table" style="max-width:400px" cellspacing="0" cellpadding="0" border="0"><tbody><tr><td width="400"><table class="ydp83a9d15ecard ydp83a9d15eyahoo-ignore-table" style="max-width:400px;border-width:1px;border-style:solid;border-color:rgb(224, 228, 233);border-radius:2px" width="100%" cellspacing="0" cellpadding="0" border="0"><tbody><tr><td><table class="ydp83a9d15ecard-info ydp83a9d15eyahoo-ignore-table" style="background-color: rgb(255, 255, 255); background-repeat: repeat; background-attachment: scroll; background-image: none; background-size: auto; position: relative; z-index: 2; width: 100%; max-width: 400px; border-radius: 0px 0px 2px 2px; border-top: 1px solid rgb(224, 228, 233);" cellspacing="0" cellpadding="0" border="0"><tbody><tr><td style="background-color:#ffffff;padding:16px 0 16px 12px;vertical-align:top;border-radius:0 0 0 2px"></td><td style="vertical-align:middle;padding:12px 24px 16px 12px;width:99%;font-family:Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif;border-radius:0 0 2px 0"><h2 class="ydp83a9d15ecard-title" style="font-size: 14px; line-height: 19px; margin: 0px 0px 6px; font-family: Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif; color: rgb(38, 40, 42); max-width: 314px;">M5700 'Knock' and other questions</h2><p class="ydp83a9d15ecard-description" style="font-size: 12px; line-height: 16px; margin: 0px; color: rgb(151, 155, 167);">My father picked up a M5700 this weekend. Overall its in nice shape, but we have a couple things we are trying t...</p></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table></a></div><div><br></div><div><br></div><div><br></div>
</div><div id="yahoo_quoted_6803953491" class="yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Wednesday, April 8, 2020, 9:36:42 AM CDT, Cecil Bearden <crbearden@copper.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="yiv7312004050"><div>
<p>I think the possibility of leftover fuel on the piston might be
the problem. Steve O may have figured it out. It has been many
years since I did a compression analysis. Old Dog forgets older
tricks thing!!!<br clear="none">
Maybe you can get an application list for the rod number??<br clear="none">
Cecil<br clear="none">
</p>
<div class="yiv7312004050yqt2602325880" id="yiv7312004050yqtfd60471"><div class="yiv7312004050moz-cite-prefix">On 4/8/2020 9:11 AM, Dave Maynard
wrote:<br clear="none">
</div>
<blockquote type="cite">
</blockquote></div></div><div class="yiv7312004050yqt2602325880" id="yiv7312004050yqtfd65902"><div><div>By reducing compression, would ignition take place
at the proper time? Would combustion be complete, or would there
be leftover fuel that could change things on next compression
stroke, and maybe pre ignite causing the knock?
<div><br clear="none">
</div>
<div>Dave</div>
</div>
<br clear="none">
<div class="yiv7312004050gmail_quote">
<div class="yiv7312004050gmail_attr" dir="ltr">On Wed, Apr 8, 2020, 5:18 AM
Stephen Offiler <<a rel="nofollow" shape="rect" ymailto="mailto:soffiler@gmail.com" target="_blank" href="mailto:soffiler@gmail.com">soffiler@gmail.com</a>> wrote:<br clear="none">
</div>
<blockquote class="yiv7312004050gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div dir="ltr">I just worked out some math. That engine is
87mm bore x 92mm stroke. 23:1 compression. Swept volume is
.547 liter, giving combustion chamber volume of .0238
liter. Now, what-if the con rod was 1mm too short? That
adds .0059 liter to the combustion chamber, now .0297 liter,
which drops compression down to 18.4:1
<div><br clear="none">
</div>
<div>SO</div>
<div><br clear="none">
</div>
</div>
<br clear="none">
<div class="yiv7312004050gmail_quote">
<div class="yiv7312004050gmail_attr" dir="ltr">On Tue, Apr 7, 2020 at
7:02 PM Doug Tallman <<a rel="nofollow" shape="rect" ymailto="mailto:dtallman@accnorwalk.com" target="_blank" href="mailto:dtallman@accnorwalk.com">dtallman@accnorwalk.com</a>>
wrote:<br clear="none">
</div>
<blockquote class="yiv7312004050gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>
<p><font size="+1">The rod being too short can't change
injector timing or cause pre-ignition. It would just
mean less compression because the piston wouldn't
come up as far. Doug T</font><br clear="none">
</p>
<div>On 4/6/2020 6:24 PM, Dave Maynard wrote:<br clear="none">
</div>
<blockquote type="cite">
<div>I know the piston is correct as we
replaced it. But James makes a good point to ponder,
if the rod is too short, it may change injector
timing.
<div><br clear="none">
</div>
<div>Dave</div>
</div>
<br clear="none">
<div class="yiv7312004050gmail_quote">
<div class="yiv7312004050gmail_attr" dir="ltr">On Mon, Apr 6,
2020, 6:03 PM Bo Hinch <<a rel="nofollow" shape="rect" ymailto="mailto:bohinch@gmail.com" target="_blank" href="mailto:bohinch@gmail.com">bohinch@gmail.com</a>>
wrote:<br clear="none">
</div>
<blockquote class="yiv7312004050gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div dir="ltr">Or the wrong Piston ( too short or
tall ) .</div>
<br clear="none">
<div class="yiv7312004050gmail_quote">
<div class="yiv7312004050gmail_attr" dir="ltr">On Mon, Apr 6,
2020 at 12:40 PM Dave Maynard <<a rel="nofollow" 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="yiv7312004050gmail_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.
<div><br clear="none">
</div>
<div>Dave</div>
</div>
<br clear="none">
<div class="yiv7312004050gmail_quote">
<div class="yiv7312004050gmail_attr" dir="ltr">On Mon,
Apr 6, 2020, 1:01 PM Mike M <<a rel="nofollow" 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="yiv7312004050gmail_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">
<br clear="none">
Mike M<br clear="none">
<br clear="none">
<br clear="none">
<div>On 4/6/2020 11:35 AM, Dave Maynard
wrote:<br clear="none">
</div>
<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>
<div><br clear="none">
</div>
<div>Dave</div>
</div>
<br clear="none">
<div class="yiv7312004050gmail_quote">
<div class="yiv7312004050gmail_attr" dir="ltr">On
Mon, Apr 6, 2020, 9:08 AM Cecil
Bearden <<a rel="nofollow" shape="rect" ymailto="mailto:crbearden@copper.net" target="_blank" href="mailto:crbearden@copper.net">crbearden@copper.net</a>>
wrote:<br clear="none">
</div>
<blockquote class="yiv7312004050gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>
<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 clear="none">
Cecil<br clear="none">
</p>
<div>On 4/6/2020 1:12 AM, <a rel="nofollow" shape="rect" ymailto="mailto:k7jdj@aol.com" target="_blank" href="mailto:k7jdj@aol.com">k7jdj@aol.com</a>
wrote:<br clear="none">
</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 clear="none">
</font></div>
<div><font size="2">Gary</font></div>
<div><font size="2"><br clear="none">
</font></div>
<div><font size="2">Renton,
WA.</font><br clear="none">
</div>
<div> <br clear="none">
</div>
<div> <br clear="none">
</div>
<div style="font-family:arial, helvetica;font-size:10pt;color:black;">-----Original
Message-----<br clear="none">
From: Roger Moffat <a rel="nofollow" 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="nofollow" 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="yiv7312004050m_7767314955428663431gmail-m_-8610138368857045324m_4006388287010896440gmail-m_1943752252575946901m_2085109996553918962m_-2421004768206050369yiv0933957868">
<div><br clear="none">
<div><br clear="none">
<blockquote type="cite">
<div id="yiv7312004050m_7767314955428663431gmail-m_-8610138368857045324m_4006388287010896440gmail-m_1943752252575946901m_2085109996553918962m_-2421004768206050369yiv0933957868yqtfd88006">
<div>On Apr 5,
2020, at 9:59
PM, Dave
Maynard <<a rel="nofollow" shape="rect" ymailto="mailto:dave@themaplehillfarm.com" target="_blank" href="mailto:dave@themaplehillfarm.com">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;">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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