Mike, Here's an idea for a simple check of the circuit....just remove the wire from the end of the oil pressure sending switch on the engine and connect it to a good ground. Turn on ignition, but don't start engine. The low pressure light should light, and alarm should sound. If not, then you likely have a wiring problem. If you leave the lead attached to ground and "wiggle" wires, you might find the problem area easily. Bill MYSTY Landfall 39 In a message dated 8/10/2015 12:32:35 P.M. Eastern Daylight Time, cnc-list@cnc-list.com writes:
Thanks Martin The engine sounded normal. When I shut it down and checked the oil level it was mid range in acceptable area on dip stick. The engine compartment did not seem hot. There was no sign of oil or coolant leakage. Oil level approx the same as when checked two weeks ago One note that may be relevant is that the warning light and buzzer occasionally does not come on when key is ON and engine Stopped. Possible loose connection because a small jiggle of starter key area and it works properly Mike From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Martin DeYoung via CnC-List Sent: Monday, August 10, 2015 1:24 PM To: cnc-list@cnc-list.com Cc: Martin DeYoung Subject: Re: Stus-List 3GM30F Oil Pressure warning Was there any noise from the engine that sounded like it was short of lube oil pressure? It is an easy and low cost test to buy a new oil pressure sending unit. Install it and test again with the engine at normal operating temp. If you still get the warning it is likely the lube oil pump. Martin Calypso 1971 C&C 43 Seattle ____________________________________ From: CnC-List [cnc-list-boun...@cnc-list.com] on behalf of Hoyt, Mike via CnC-List [cnc-list@cnc-list.com] Sent: Monday, August 10, 2015 9:17 AM To: _cnc-list@cnc-list.com_ (mailto:cnc-list@cnc-list.com) Cc: Hoyt, Mike Subject: Stus-List 3GM30F Oil Pressure warning 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 _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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