[AT] Kubota M5700 noise

Dave Maynard dave at themaplehillfarm.com
Mon Apr 6 10:36:15 PDT 2020


Yes, checked all tolerances.

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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