[AT] Kubota M5700 noise

[Dave Maynard]

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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