[C320-list] Oil Pressure warning

[rcooley at twcny.rr.com]

I had a similiar problem, except it was the temperature gauge.  Same symtoms.  After operating temp, when idled back an alarm, not full alarm.  Replaced the sensor and things went back to normal, with no more alarm at idle.
---- Colin Evans <twosailors at bigpond.com> wrote: 
>  I have a 2000 model Yanmar 3GM30F.  When I start the engine the oil
> pressure alarm and light come on as they are supposed to. However when the
> boat has been motoring for 20 minutes or so and I put the throttle back to
> idle the alarm sounds, but not a full alarm, sort of intermittent and the
> light flickers.
> I have changed the engine oil which was 6 months old, probably 40 hours,
> thinking it may be getting too thin when hot.  I have run the engine in the
> pen to working temperature at fast revs, then back to idle , but no alarm.
> Any thoughts as to whether this is an electrical problem or do I have low
> oil pressure.
>  
> ************************************
> Regards
> Colin Evans
> #774  Lake Macquarie, Australia
>  
>