One thing that can cause this is when the oil is not draining back from the head or wherever fast enough. At higher RPM you might be pumping more oil up, and after a while sucking air in the pan instead of oil.
You might be able to determine if this is the case by measuring the oil level by dipstick while it is running with alarm on. Or you could pull the rocker cover and check the drain holes. Note that in most non-sailboat applications the engine is level and multiple holes share the duty. I am guessing your 3GM30F may be at an incline, so if the rear drain is clogged it might cause the problem. Or not. Lots of other options. Michael Brown Windburn C&C 30-1 A heavy duty oil cleaner may help. Date: Mon, 10 Aug 2015 16:17:45 +0000 From: "Hoyt, Mike" <mike.h...@impgroup.com> To: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> Subject: Stus-List 3GM30F Oil Pressure warning Message-ID: <169e312f80b4c044be2dc1780a7de72f0db...@hfxexc11.impgroup.com> Content-Type: text/plain; charset="utf-8" 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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