Cooling water flow?  When changing the light bulbs or wiring in the past it
is easy enough to imagine a mixup.  Checking engine temp is where I would
start.

You could also have a very slight dilution of your oil with fuel.  After it
gets hot enough the viscosity drops and causes your low pressure alarm.
The priming pumps have a  rubber diaphragm that when degraded allows diesel
into the crankcase.  Bad HP injector pump seals can also let fuel in the
crankcase.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
On Aug 10, 2015 12:18 PM, "Hoyt, Mike via CnC-List" <cnc-list@cnc-list.com>
wrote:

> Oil changed in May. Used 15W 40
>
> Oil level checked July 22
>
> 300 mile delivery to Cape Breton (Dundee then Baddeck) July 23 – Aug 2
>
>
>
> Yesterday after running engine at 2800 RPM for approx. 5.5 hrs a “clicking
> sound” was heard in cockpit.  Thought at first was from Ram mic  but was
> still there once disconnected.  Determined was coming from alarm speaker on
> Yanmar panel.  Tapped panel and then Oil pressure light illuminated and
> alarm sounded.  Shut down engine and sailed to dock (without crashing)
>
>
>
> At dock started engine and at idle no alarm or light.  Revved up to 3000
> RPM and the light started flickering and a sputtering sound from the
> speaker (the clicking sound we heard earlier) which was followed by full
> illumination of Oil pressure light and full alarm siren.  Stoped engine and
> waited.
>
>
>
> A few minutes later retarted engine and had no alarm at idle, followed by
> sputtering and then full alarm at high rpms. Reduced RPMs to idle and alarm
> stopped and light turned off.
>
>
>
> Any thoughts?
>
>
>
> Boat is currently 3.5 hrs away by car so any parts will have to be taken
> with me in advance
>
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