I think it could just as easily be the temperature switch. Mine went bad on my Westerbeke 21 a couple of years ago.
On Thu, Jun 6, 2019 at 7:25 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 > >
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