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 > >
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