[AT] Kubota M5700 noise

Sat Aug 8 17:12:29 PDT 2020

Here is the YouTube link of the video -
https://www.youtube.com/watch?v=pMxOofbbJOA

guess I should have supplied it earlier!

99% sure the source of the noise has been located - see attached picture
(if the list allows them....  been many years since I participated much)

Mike

On Sun, Apr 19, 2020 at 6:26 AM Stephen Offiler <soffiler at gmail.com> wrote:

> 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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