<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">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">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">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">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">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">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">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"><rogerkiwi@gmail.com></a><br>
To: Antique Tractor Email Discussion
Group <a href="mailto:at@lists.antique-tractor.com" rel="noreferrer noreferrer
noreferrer noreferrer" target="_blank"><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_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">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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