Mike;
Josh is correct in saying the "F" in the model number of older Yanmar engines designated freshwater cooled, and the use of a heat exchanger on the engine. On a freshwater cooled engine the water/glycol coolant mix in the block is circulated through a heat exchanger - which is analogous to the radiator in your car. Raw water, drawn from outside of the boat, is circulated through the heat exchanger and removes the heat from the water/glycol coolant before being used to cool the exhaust gasses and being discharged overboard. In your car, the relatively cold air passing through the radiator takes the heat away from the water/glycol coolant in the engine. If there is no "F" in the model number of an older Yanmar, it is a raw water cooled engine. Seawater is drawn from outside, pumped through the engine to cool it, then mixed with the exhaust to cool that, and then discharged overboard. Now I said "older" Yanmar engines because every model in their current product line seems to come with a heat exchanger and fresh water cooling. In response to another comment made about the "GM", "HM", "QM" model designation (the current engines are "YM") that is a model series designation. It almost looks like it relates to the generation of emission controls present on the engine. I notice that the YM series is designed to meet the diesel emission standards that started to become effective in 2011 in the US. So "2" or "3" is the number of cylinders. "GM" etc. is the engine series. "30" is the nominal horsepower. And "F" is freshwater cooled. (On the 4 cylinder engines "TE" is turbocharged, and "ETE" is intercooled and turbocharged.) Your idea about having an engine powered heater for the boat is an interesting one. It would be relatively easy to tap the hot water/glycol cooling system (we do it all the time now for installing a water heater on the boat) and route some of the coolant through a radiator inside the cabin (analogous to the heater core in your car). An electric fan could provide air circulation. And you would want to come up with some sort of thermostatically controlled valve to throttle the flow of hot water to match the heating needs inside the cabin. Pretty doable, but the devil would be in the details. Rick Brass Imzadi C&C 38 mk 2 la Belle Aurore C&C 25 mk1 Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Hoyt, Mike via CnC-List Sent: Wednesday, December 03, 2014 8:29 AM To: Josh Muckley; cnc-list@cnc-list.com Subject: Re: Stus-List LF38 engine access - how bad is it really? Josh I am guessing heat exchanger that you refer to does not mean the same as in everyday life where it can be used as a heater for the boat with some reworking. Am I incorrect? I have 3GM30F and some days it is miserably cold while underway and the option of an onboard engine driven heater might be nice Also. I think your landfall38s likely have tons more access than our frers 33 with an oversized engine. Maybe Rich and I will have to compare next summer Mike Persistence From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh Muckley via CnC-List Sent: Tuesday, December 02, 2014 11:55 PM To: Patrick Davin; C&C List Subject: Re: Stus-List LF38 engine access - how bad is it really? The difference between the GM and HM are negligible. Most/many parts are interchangeable. The HM only came in 3 cylinders and had a slightly higher power rating. The F designation means that it has a glycol (fresh water) coolant system and heat exchanger. The GM came in 1, 2 and 3 cylinder versions in which parts were directly interchangeable. Visually I believe all of the GMs have a place where a handle can be attached to the front of the engine to presumably hand crank. I have a Yanmar service manual that covers all of the HM and GM variants. Not sure about the QM. As for access I enjoy 3 sides but could survive comfortably with just front and back. Front alone would be quite challenging. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Yanmar 3HM35F Solomons, MD On Dec 2, 2014 10:40 PM, "Patrick Davin via CnC-List" <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: I took a look at a Landfall 38 last week, and yeah it's pretty bad (engine access). But does it actually prevent you from doing any critical tasks or is it more of a nuisance? Also anyone know the differences between the Yanmar 3QM30F, 3HM30F, and 3GM, either in terms of size (access) or power / longevity? The boat I looked at had the engine recorded as HM, as either a correction or upgrade (to a survey which indicated it was QM), but the owner said on this forum (a few years ago) that it came with a GM. The broker said it has the original engine. So this is very confusing/misleading, but will try to clarify with broker which it actually is. _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com <mailto:CnC-List@cnc-list.com> To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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