[AT] Kubota M5700 noise

[Bo Hinch]

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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