[AT] Kubota M5700 noise

[Doug Tallman]

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

On 4/6/2020 6:24 PM, Dave Maynard wrote:
> 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.
>
> Dave
>
> On Mon, Apr 6, 2020, 6:03 PM Bo Hinch <bohinch at gmail.com 
> <mailto:bohinch at gmail.com>> wrote:
>
>     Or the wrong Piston ( too short or tall ) .
>
>     On Mon, Apr 6, 2020 at 12:40 PM Dave Maynard
>     <dave at themaplehillfarm.com <mailto:dave at themaplehillfarm.com>> wrote:
>
>         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.
>
>         Dave
>
>         On Mon, Apr 6, 2020, 1:01 PM Mike M <meulenms at gmx.com
>         <mailto:meulenms at gmx.com>> wrote:
>
>             When you had it apart, did you check all the piston,ring
>             and bearing clearances?
>
>             Mike M
>
>
>             On 4/6/2020 11:35 AM, Dave Maynard wrote:
>>             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.
>>                  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.
>>                  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.
>>
>>             Dave
>>
>>             On Mon, Apr 6, 2020, 9:08 AM Cecil Bearden
>>             <crbearden at copper.net <mailto:crbearden at copper.net>> wrote:
>>
>>                 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.
>>                 Cecil
>>
>>                 On 4/6/2020 1:12 AM, k7jdj at aol.com
>>                 <mailto:k7jdj at aol.com> wrote:
>>>                 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?
>>>                 I would do a compression check as well.
>>>
>>>                 Gary
>>>
>>>                 Renton, WA.
>>>
>>>
>>>                 -----Original Message-----
>>>                 From: Roger Moffat <rogerkiwi at gmail.com>
>>>                 <mailto:rogerkiwi at gmail.com>
>>>                 To: Antique Tractor Email Discussion Group
>>>                 <at at lists.antique-tractor.com>
>>>                 <mailto:at at lists.antique-tractor.com>
>>>                 Sent: Sun, Apr 5, 2020 7:43 pm
>>>                 Subject: Re: [AT] Kubota M5700 noise
>>>
>>>
>>>
>>>>                 On Apr 5, 2020, at 9:59 PM, Dave Maynard
>>>>                 <dave at themaplehillfarm.com
>>>>                 <mailto:dave at themaplehillfarm.com>> wrote:
>>>>
>>>>                 Have cracked injector lines one at a time, and it
>>>>                 gets quieter on #5
>>>
>>>                 But only on #5?
>>>
>>>                 When you crack the others the engine misses, but the
>>>                 noise remains?
>>>
>>>                 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?
>>>
>>>                 Eg #5 piston slightly higher than the other 4?
>>>
>>>                 Roger
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