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<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>
Maybe you can get an application list for the rod number??<br>
Cecil<br>
</p>
<div class="moz-cite-prefix">On 4/8/2020 9:11 AM, Dave Maynard
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAHUEO=MXc8yKPVFkfQTqwgrzJEz5+K8ScMwkPuRLT5ACnANXKQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">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 dir="auto"><br>
</div>
<div dir="auto">Dave</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Apr 8, 2020, 5:18 AM
Stephen Offiler <<a href="mailto:soffiler@gmail.com"
moz-do-not-send="true">soffiler@gmail.com</a>> wrote:<br>
</div>
<blockquote class="gmail_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>
</div>
<div>SO</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Apr 7, 2020 at
7:02 PM Doug Tallman <<a
href="mailto:dtallman@accnorwalk.com" target="_blank"
rel="noreferrer" moz-do-not-send="true">dtallman@accnorwalk.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_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>
</p>
<div>On 4/6/2020 6:24 PM, Dave Maynard wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">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 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, 6:03 PM Bo Hinch <<a
href="mailto:bohinch@gmail.com" target="_blank"
rel="noreferrer" moz-do-not-send="true">bohinch@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_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>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Apr 6,
2020 at 12:40 PM Dave Maynard <<a
href="mailto:dave@themaplehillfarm.com"
rel="noreferrer noreferrer" target="_blank"
moz-do-not-send="true">dave@themaplehillfarm.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="auto">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 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, 1:01 PM Mike M <<a
href="mailto:meulenms@gmx.com"
rel="noreferrer noreferrer"
target="_blank" moz-do-not-send="true">meulenms@gmx.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF"> When you had it
apart, did you check all the piston,ring
and bearing clearances?<br>
<br>
Mike M<br>
<br>
<br>
<div>On 4/6/2020 11:35 AM, Dave Maynard
wrote:<br>
</div>
<blockquote type="cite">
<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"
rel="noreferrer noreferrer
noreferrer" target="_blank"
moz-do-not-send="true">crbearden@copper.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div 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"
rel="noreferrer noreferrer
noreferrer noreferrer"
target="_blank"
moz-do-not-send="true">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"
rel="noreferrer
noreferrer noreferrer
noreferrer"
target="_blank"
moz-do-not-send="true"><rogerkiwi@gmail.com></a><br>
To: Antique Tractor Email
Discussion Group <a
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rel="noreferrer
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target="_blank"
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Sent: Sun, Apr 5, 2020
7:43 pm<br>
Subject: Re: [AT] Kubota
M5700 noise<br>
<br>
<div
id="m_7767314955428663431gmail-m_-8610138368857045324m_4006388287010896440gmail-m_1943752252575946901m_2085109996553918962m_-2421004768206050369yiv0933957868">
<div><br clear="none">
<div><br clear="none">
<blockquote
type="cite">
<div
id="m_7767314955428663431gmail-m_-8610138368857045324m_4006388287010896440gmail-m_1943752252575946901m_2085109996553918962m_-2421004768206050369yiv0933957868yqtfd88006">
<div>On Apr 5,
2020, at 9:59
PM, Dave
Maynard <<a
rel="noopener
noreferrer
noreferrer
noreferrer
noreferrer
noreferrer"
shape="rect"
href="mailto:dave@themaplehillfarm.com"
target="_blank" moz-do-not-send="true">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>
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