Hi John- My manual makes no maintenance period recommendation for the fresh water impeller. Not mentioned in maintenance at all. Does yours? I am unclear on why the raw water needs periodic maintenance and the fresh water does not. Is it a similar rubber impeller? Dave
S/V Aries 1990 C&C 34+ New London, CT > On Jun 9, 2020, at 8:47 AM, John Conklin via CnC-List <cnc-list@cnc-list.com> > wrote: > > Just rebuilt my freshwater pump on my 3HM which was done aftermarket as it > covers the engine ID plate. > Was leaking just a bit but the bit caused some rust and ceased the engine > kill switch on that side of engine > Needed impeller change anyway ;) > > > John Conklin > S/V Halcyon > S/V Heartbeat > www.flirtingwithfire.com > > >> On Jun 8, 2020, at 12:02 PM, Doug Mountjoy via CnC-List >> <cnc-list@cnc-list.com> wrote: >> >> >> David, >> You have a circulating pump usually driven by a belt off of the crank >> pulley, also this belt drives the alternator. This pump usually doesn't >> require any maintenance. There is a weep hole below the shaft to signal when >> a seal has failed. There is a thermostat that controls the temperature of >> the engine, on the output side of the fresh water side of the cooling system >> before the coolant enters the heat exchanger. Once again not much >> maintenance required unless the engine is either too hot or not getting to >> temp, around 180 deg f. >> >> Hope this helps. >> Doug >> >> On Mon, Jun 8, 2020 at 8:47 AM David Knecht via CnC-List >> <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: >> I thought I might have had a problem with the fresh water side of the >> cooling system of my Universal M4-30 engine because it was heating water >> very slowly. I now think that it is just that the sea water is cold this >> time of year and it was taking longer than I expected. All was fine with >> lots of hot water after an extended motoring session at speed as opposed to >> idling at the mooring. However, it made me think about this side of the >> cooling system. Presumably, minimal fresh water circulates through the heat >> exchanger until the thermostat opens. My question is, what drives that >> water circulation. I know to check the impeller on the raw water pump side >> periodically, but I have seen no mention of doing the same for a water pump >> on the fresh water side. That pump appears to be pretty inaccessible on my >> engine anyway and nothing in the routine maintenance section talks about >> periodic replacement of an impeller there. So I am guessing it does not >> have an impeller that needs replacement, but I can’t find anything relevant >> in the manual. Thanks- Dave >> >> David Knecht >> S/V Aries >> 1990 C&C 34+ >> New London, CT >> >> <pastedGraphic.tiff> >> >> _______________________________________________ >> >> 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 >> <https://www.paypal.me/stumurray> >> >> >> >> -- >> Douglas Mountjoy >> 253-208-1412 >> Port Orchard YC, WA >> Rebecca Leah >> C&C LandFall 39 >> _______________________________________________ >> >> 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 >> > <pastedGraphic.tiff>_______________________________________________ > > 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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