[AT] Kubota M5700 noise

Sun Apr 19 03:26:01 PDT 2020

Me neither.  Error:
Access to r3---sn-vgqsrnek.googlevideo.com was denied You don't have
authorization to view this page.

On Sun, Apr 19, 2020 at 12:00 AM Mike M <meulenms at gmx.com> wrote:

> Won't load for me Dave.
>
> Mike M
>
>
> On 4/18/2020 4:52 PM, Dave Maynard wrote:
>
> Will do Mike. I appreciate all the help and interest in helping me find a
> solution to this problem. Many very experienced and knowledgeable people on
> here and I certainly enjoy reading everything and many times learning
> things. We haven't gotten very much further with this due to some other
> pressing things, but will. New injectors made no difference at all. Just
> today however, the guys are working on  a four cylinder version of this
> Kubota  engine and sent me the attached video clip. Sounds very similar to
> my noise. Weak valve spring in the head, see what you all think. If you
> click on this, at the bottom it says "go to link" and it will get you
> there. Sorry, haven't been on a computer since I retired and just got my
> laptop back from my son who fixed it, so figuring how to get this texted
> video to attach to the email was a chore and not sure if this was the way,
> but it worked! Lol
>
> Dave Maynard
> The Maple Hill Farm
> Marion, NY
>
> https://r3---sn-vgqsrnek.googlevideo.com/videoplayback?expire=1587249885&ei=vWabXuqQJ-yPir4PnP2b0Ag&ip=74.69.206.141&id=8e77dec671cecdd0&itag=37&source=picasa&begin=0&requiressl=yes&mh=4G&mm=30&mn=sn-vgqsrnek&ms=nxu&mv=u&mvi=2&pl=23&sc=yes&susc=ph&app=fife&mime=video/mp4&cnr=14&dur=6.153&lmt=1587239101906161&mt=1587242304&sparams=expire,ei,ip,id,itag,source,requiressl,susc,app,mime,cnr,dur,lmt&sig=AJpPlLswRQIhAMem1LR4HFWc9FRrnjAuULSl_8Hct2cwBUMJvVjpSp08AiAKJ78mrFHMS8CdrtzfOAcROoIhrd9w_-3bWHzQSXHX_A==&lsparams=mh,mm,mn,ms,mv,mvi,pl,sc&lsig=ALrAebAwRAIgOvaXXGqqyzob2OV9veVkI84nmv2LSX6Pa1YivEL5jbMCIFnKOojXR0kxcC_cjLU_y9tvAbOImRgjUxXal3_let-J
>
>
> On Sat, Apr 18, 2020 at 1:16 PM Mike M <meulenms at gmx.com> wrote:
>
>> Keep us updated Dave, this has been an interesting and informative thread.
>>
>> Mike M
>>
>>
>> On 4/8/2020 12:57 PM, Dave Maynard wrote:
>>
>> By the way, not even sure if this has the wrong rod, just been guessing
>> until we can get it in and apart. I wonder though if there could be
>> residual fuel from an unfinished burn caused by yet unknown reason. Maybe
>> carbon buildup in pre combustion chamber which may cause higher compression
>> or poor atomization. Maybe Cecil's thought of loose or cracked pre
>> combustion chamber. Unseen crack in the head, causing an improper mixture,
>> or maybe even a piston pin bearing we missed. Still dont know how soon we
>> can get it inside and apart, as we need to get a place ready. Don't want it
>> apart outside, and this time it could be apart a little longer than the
>> others.
>>
>> Dave M.
>>
>> On Wed, Apr 8, 2020, 12:46 PM Dave Maynard <dave at themaplehillfarm.com>
>> wrote:
>>
>>> The tractor in NY you are referring to IS this tractor. That is a post
>>> my son Mike made back when we first got it. You may recognize him on here
>>> as Mangus.
>>>
>>> Dave M
>>>
>>> On Wed, Apr 8, 2020, 11:58 AM ustonThomas Mehrkam <
>>> tmehrkam at sbcglobal.net> wrote:
>>>
>>>> A Google search for  kubota M5700 engine noise  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
>>>>
>>>> M5700 'Knock' and other questions
>>>> <https://www.tractorbynet.com/forums/kubota-owning-operating/413832-m5700-knock-other-questions.html>
>>>>
>>>>
>>>> M5700 'Knock' and other questions
>>>>
>>>> My father picked up a M5700 this weekend. Overall its in nice shape,
>>>> but we have a couple things we are trying t...
>>>>
>>>> <https://www.tractorbynet.com/forums/kubota-owning-operating/413832-m5700-knock-other-questions.html>
>>>>
>>>>
>>>>
>>>> On Wednesday, April 8, 2020, 9:36:42 AM CDT, Cecil Bearden <
>>>> crbearden at copper.net> wrote:
>>>>
>>>>
>>>> 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!!!
>>>> Maybe you can get an application list for the rod number??
>>>> Cecil
>>>> On 4/8/2020 9:11 AM, Dave Maynard wrote:
>>>>
>>>> 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?
>>>>
>>>> Dave
>>>>
>>>> On Wed, Apr 8, 2020, 5:18 AM Stephen Offiler <soffiler at gmail.com>
>>>> wrote:
>>>>
>>>> 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
>>>>
>>>> SO
>>>>
>>>>
>>>> On Tue, Apr 7, 2020 at 7:02 PM Doug Tallman <dtallman at accnorwalk.com>
>>>> wrote:
>>>>
>>>> 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> wrote:
>>>>
>>>> Or the wrong Piston ( too short or tall ) .
>>>>
>>>> On Mon, Apr 6, 2020 at 12:40 PM Dave Maynard <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> 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>
>>>> 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 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> <rogerkiwi at gmail.com>
>>>> To: Antique Tractor Email Discussion Group
>>>> <at at lists.antique-tractor.com> <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>
>>>> 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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