Replaced well paid for replacement Friday of my exhaust elbow on my 82 /37ft yanmar 3HM sure it could not be original but it was full of $#!^ for sure
John Conklin ________________________________ From: CnC-List <cnc-list-boun...@cnc-list.com> on behalf of Rick Brass via CnC-List <cnc-list@cnc-list.com> Sent: Monday, May 28, 2018 10:15:54 AM To: cnc-list@cnc-list.com Cc: Rick Brass Subject: Re: Stus-List thermostat on 3QM30H Bill; A “raw” water cooled engine passes water from outside the boat ( in your case lake water) through the engine for cooling. A “fresh” water cooled engine has antifreeze in the engine and a heat exchanger, and the lake water only passes through the heat exchanger to cool the antifreeze circulating inside the engine. Josh’s note about making sure you have the correct thermostats installed in your engine is spot on. A raw water engine uses a low temperature thermostat and has a low operating temperature. I would have guesses 120-125, but Josh found a spec of 108 for the thermostat. Your operating temperature when the engine is under load should be around 140-145. That helps to prevent deposits inside the engine that will block the cooling passages. A fresh water engine runs at a higher temperature – diesels are more efficient at higher temperatures. You use a 165 degree thermostat and the engine can get to 180-190 under load. One consequence of the lower temperature in a raw water engine is that there is increased production of unburned hydrocarbons and soot. Back in the day, when I was a Yanmar certified technician and teaching diesel mechanics, the consensus among the mechanics was that the exhaust elbow on the Yanmar 2 and 3 cylinder marine engines should have the carbon buildup cleaned out every 50 to 100 hours – at least yearly – as preventative maintenance. On a raw water engine like yours, that would be a very good idea. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh Muckley via CnC-List Sent: Sunday, May 27, 2018 11:04 AM To: C&C List <cnc-list@cnc-list.com> Cc: Josh Muckley <muckl...@gmail.com> Subject: Re: Stus-List thermostat on 3QM30H 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<mailto: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<mailto: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<https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F0B8pEh5lnvP1yenJtR1BxWjhqZGs%2Fview%3Fusp%3Ddrivesdk&data=02%7C01%7C%7C4d3e66f52d0743a10aac08d5c4a5a14e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636631138003674934&sdata=BO0vlWCH92gMTQPiy746eYvOYs4fvwZ1FSOwwmbzMEM%3D&reserved=0> Josh On Sun, May 27, 2018, 9:28 AM William Walker via CnC-List <cnc-list@cnc-list.com<mailto: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<mailto: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<mailto: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. 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