Eric;
You didn't say what engine you are working with. If it is a Yanmar, the sudden onset of no water flow suggest that the exhaust elbow is plugged with carbon. Particularly if you've not taken action to remove the carbon buildup in the last 100-200 engine hours. If you still have an A4, or the Westerbeke that was an option, I'd guess the problem is most likely a worn or damaged impeller in the raw water pump. "Sudden" onset of the problem seems to argue against that, but it is possible that worn vanes might prevent the vanes from getting a good seal and creating suction needed to fill the cooling system. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Eric Frank via CnC-List Sent: Wednesday, May 30, 2018 1:47 PM To: cnc-list@cnc-list.com Cc: Eric Frank <efran...@mac.com> Subject: Stus-List problem getting the raw water flowing Never had trouble with this before, but this year I could not get the raw water going out the exhaust when I was getting ready for launching. Always use a bucket of fresh water on the intake to the raw water pump (new impeller every year) just to make sure things are working. Engine started fine but no water out the exhaust. Impeller was turning when I cranked the engine so thought the problem might be downstream of that. A mechanic at the yard reported back that things were fine and he just had to run the engine at a high RPM to get the raw water flowing. Anyone else experience that? Does it suggest that the tubes where the raw water cools the engine water could be getting clogged? Advice appreciated. Eric Frank Cat's Paw C&C 35 Mk II Mattapoisett, MA
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