A leak at the heat exchanger was exactly what I suspected. The heat exchanger ends should come off easily with 4 nuts/bolts on each end. The tube bundle and deflector plates should just slide out. If even just the o-ring has gone bad you can get coolant leaking into the raw water. You'd ever see the leak. A coolant system pressure check might prove/disprove that a leak exsists
Josh Muckley S/V Sea Hawk 1989 C&C 37 + Solomons, MD On Fri, Apr 5, 2019, 12:44 PM Jerome Tauber via CnC-List < cnc-list@cnc-list.com> wrote: > Had same Problem on Beneteau 411 and indeed there was a hole in the heat > exchanger so antifreeze got pumped out with raw water. Jerry > > Sent from my iPhone > > On Apr 5, 2019, at 11:48 AM, Gary Russell via CnC-List < > cnc-list@cnc-list.com> wrote: > > You can't rule out a head gasket, either. Look for a milky substance in > the engine oil. > Gary > S/V Kaylarah > '90 C&C 37+ > East Greenwich, RI, USA > ~~~~~~~_/)~~~~~~ > > > > On Fri, Apr 5, 2019 at 11:47 AM ALAN BERGEN via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Over a period of time, I'm losing antifreeze from the engine. I haven't >> seen any leaks coming from any of the hoses or hose connections while the >> engine is running. Can anyone confirm that the likely cause is a leak in >> the heat exchanger? The engine is a Yanmar 3GMf, 20hp model. How difficult >> is it to replace/repair the heat exchanger core? >> >> Alan Bergen >> 35 Mk III Thirsty >> Rose City YC >> Portland, OR >> _______________________________________________ >> >> 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 > > _______________________________________________ > > 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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