Absolutely leave 2 thermostats. I never suggested otherwise. Without a thermostat in one or both of the ports it will act as though the thermostat is wide open all the time providing maximum cooling and the engine will likely never come up to temperature. I was only trying to explain the disparity between your manual and your engine, suggesting that your information (drawings/manual) may have been for the freshwater variant and that because of this disparity you may have also inadvertently installed a thermostat with a freshwater temperature setpoint.
Josh On Sun, May 27, 2018, 10:41 AM William Walker via CnC-List < cnc-list@cnc-list.com> wrote: > Josh, > Thanks, but I must have older or newer than that diagram (1981 boat). > My thermostat housing is on top of exhaust manifold, square in shape with 4 > distinct chambers, two of which are machined to accept thermostats.. > I think I will just leave as has been for the 7 years I have owned > boat. a thermostat in each chamber.. > Bill > > Sent from AOL Mobile Mail > ------------------------------ > On Sunday, May 27, 2018 Josh Muckley via CnC-List <cnc-list@cnc-list.com> > wrote: > Bill, > > Check out page 162 in the following link. On page 182 it describes the > thermostat setpoints. 160 = fresh and 108 =raw. > > > https://drive.google.com/file/d/0B8pEh5lnvP1yenJtR1BxWjhqZGs/view?usp=drivesdk > > Josh > > On Sun, May 27, 2018, 9:28 AM William Walker via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Josh, >> I have a drawing from yanmar manual, not quite same as yours. My >> thermostat cover has bolt pattern different..fore and aft and side to >> side..I am always confused by "raw water, fresh water" thing...I draw lake >> water in and through engine and out...no antifreeze or heat exchange..just >> direct through and out. >> Bill. >> >> Sent from AOL Mobile Mail >> ------------------------------ >> On Sunday, May 27, 2018 Josh Muckley via CnC-List <cnc-list@cnc-list.com> >> wrote: >> Is your engine fresh water or raw water cooled. By the model number I'm >> guessing that it is raw water cooled. I don't have the manuals for the QM >> series but believe that they are the predecessor to the HM and GM. As such >> many of the parts are interchangeable and much of the design is the same. >> In my parts diagrams it shows 2 thermostats but only on the raw later >> cooled versions of the HM/GM. I'll send you a picture off list. >> >> Josh Muckley >> S/V Sea Hawk >> 1989 C&C 37+ >> Solomons, MD >> >> On Sun, May 27, 2018, 8:35 AM William Walker via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >>> Good morning, >>> Yesterday I removed the thermostat cover on top of the exhaust >>> manifold to replace the thermostat which I suspected was bad. I have a >>> yanmar service manual which has detailed drawings of the exhaust manifold >>> on this sea water cooled engine. To my surprise when I removed the cover >>> there were TWO thermostats installed for and aft on starboard side of the >>> exhaust manifold ports. The Yanmar service manual shows only ONE, in the >>> forward port. >>> Since I only had one new thermostat I installed it in the forward port >>> on manifold, cleaned up the other from corrosion and put it back where it >>> was. The second port is machined to accept a thermostat. >>> If you have a yanmar service manual, pictures of this on page 7-A-2 >>> showing one thermostat. >>> Since these two ports are connected internally and water can flow >>> through both I am thinking that this is a safety factor. If one fails the >>> other still may open and allow cooling water to engine. >>> Any thoughts if this second thermostats belongs there? I have been >>> running this engine with it in place for 7 years and I suspect prior owner >>> did as well for a time. >>> Bill Walker >>> Evening Star >>> CnC 36 >>> Pentwater, Mi >>> >>> Sent from AOL Mobile Mail >>> _______________________________________________ >>> >>> 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 >> >> _______________________________________________ > > 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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