[AT] Kubota M5700 noise

[Cecil Bearden]

Back when I could overhaul a 350 chevy for $100 in parts, I tore one 
down to find out what the knock was and never found it!! Later I had a 
bad scar in a 305 cylinder wall and bored it out with an old old T model 
era cylinder hone.  The bore had a .004 taper from bottom to top.  I 
installed a 0.010 oversize piston. It knocked, but used no oil.  Ran 
good.  After about 15K miles I sold the pickup to a couple buying it for 
their 16yr old son's birthday.  The kid drove it all through high school 
and part of college.  He sold it and bought a later model.  The engine 
that knocked,   still knocked at over 150K miles...  Sometimes a knock 
is not too bad...
Cecil

On 4/5/2020 10:35 PM, Thomas Martin wrote:
>
> I was wondering about a errant piston, too. Have struck once on an AC 
> crawler engine.
>
> Also came across an over length con rod once, how that was made was a 
> bit of a mystery.
>
> Have you thought about a compression test?
>
> Tom
>
>> On 06 April 2020 at 14:42 Roger Moffat <rogerkiwi at gmail.com> wrote:
>>
>>
>>
>>> On Apr 5, 2020, at 9:59 PM, Dave Maynard < dave at themaplehillfarm.com 
>>> <mailto: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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