The oil pressure switch and the temperature switch are most likely independent of their respective senders for the gauges. You can check them for continuity to ground - Just across the screw on back to the engine block. A loose wire can also cause your symptom. I believe that the temp switch goes closed on high temp so it's normal shutdown (cold) indication should be open. The oil is opposite. It should be closed when shutdown (low pressure). If the wire to the oil pressure got loose or went bad (even all the way back to the control panel) you'll get the same result as low oil pressure.
Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Thu, Jun 6, 2019, 10:25 PM Nathan Post via CnC-List < cnc-list@cnc-list.com> wrote: > Hello, > > On the way back to the marina this evening the oil pressure alarm went off > after having motored about 10 minutes (and previously an hour earlier > motored 20 minutes or so out). I have a Westerbeke 20B2 diesel in my > boat. We have the admiral style control panel so that has both the > temperature and oil pressure gauges as well as the alar buzzer. Everything > looked normal on the gauges with the oil pressure reading about 40 psi at > 2500-2700 rpm (manual says 35 - 60 is normal so maybe slightly on the low > side but still in range). The same buzzer is connected to the over > temperature alarm as well but temperature also seemed fine and cooling > water was flowing. I shut down the engine and checked the oil level - > which was just fine, right where it had been earlier in the day at the full > mark. Given that we were in the middle of the channel and everything > seemed to check out I ended up deciding to start her again and motored the > remaining 10 minutes or so back to the marina (with the buzzer going the > whole time). The oil pressure stayed at 40 psi until I slowed her to an > idle at which point it dropped to 25-30 psi. I think that is pretty > typical. According the the manual the buzzer should sound at below 10 psi > as it does when you first start the engine. > > My question is: Do I assume that the sending switch for the oil pressure > alarm is faulty and order a replacement? Is there anything else I should > check or verify to ensure that the oil pump is in fact working correctly > and the oil is getting distributed through the engine? Is there another > part I should look into that could be causing this behavior? > > Thanks! > Nathan Post > S/V Wisper > 1981 C&C34 > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
