Also not expensive to get a mechanical oil pressure gauge and hook it up, even 
if you only want to do it temporarily. Actually just about any mechanical 
pressure gauge will work for test purposes, including air pressure gauges, just 
get one with an appropriate pressure range. 

Steve Thomas
C&C27 MKIII
Port Stanley, ON
  ----- Original Message ----- 
  From: Martin DeYoung via CnC-List 
  To: cnc-list@cnc-list.com 
  Cc: Martin DeYoung 
  Sent: Monday, August 10, 2015 12:24
  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
  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



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