[AT] Kubota M5700 noise

[Thomas Martin]

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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