If something is blocking the through hull, you might try connecting a shop vac (air outlet) to the through hull after removing the hose. Shoving a screwdriver down the seacock might just poke a hole in whatever might be blocking the inlet, without removing the blockage.
Alan On Thu, Jun 5, 2025 at 9:46 AM ALAN BERGEN <trya...@alumni.usc.edu> wrote: > Air might be getting in without water leaking. It happened to me once, and > it took me a while to figure it out. > > Alan > > > On Thu, Jun 5, 2025 at 9:00 AM David Knecht via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Hi alan. Wont it leak water if seal is not tight? I have new gaskets on >> order but figured if it didn’t leak i was ok for now. Dave >> Sent from my iPhone >> >> On Jun 5, 2025, at 11:39 AM, ALAN BERGEN via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >> >> If the cap on the raw water strainer doesn't have a tight seal, you won't >> get water pumping. >> >> Alan >> >> >> On Thu, Jun 5, 2025 at 8:31 AM David Knecht via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >>> Eliminated many possibilities yesterday. Pump shaft turning fine. >>> Replaced impeller. Still not pumping water. Has anyone had a priming >>> problem? My current hypothesis is that either the pump is not self priming >>> or the seacock is partially plugged limiting flow. Water comes into raw >>> water strainer with lid off but no idea if it is normal rate or not. Dave >>> >>> Sent from my iPhone >>> >>> On May 30, 2025, at 9:39 PM, Ronald Scott via CnC-List < >>> cnc-list@cnc-list.com> wrote: >>> >>> Possibly the impeller connection to the sea water pump pulley became >>> disconnected…resulting in the impeller not being turned to pump properly >>> the sea water. This happened to me when I had installed both a new >>> seawater pump and a new impeller. The guy doing the installation made the >>> connection better between the impeller and the sea water pump pulley, and >>> normal pumping of water resumed out the stern. He did say that the pulley >>> was somewhat worn (where it connects with the impeller), and suggested I >>> install a new pulley. Hope this helps! >>> Ron Scott >>> C&C 35 MK II (Rapid Transit) >>> Drayden, MD >>> Danville, Ky >>> Sent from my iPhone >>> >>> On May 30, 2025, at 3:51 PM, ALAN BERGEN via CnC-List < >>> cnc-list@cnc-list.com> wrote: >>> >>> >>> Is the belt tight enough? Run the engine and see whether the pump is >>> turning. If not, tighten the belt. If yes, remove the exit hose from the >>> pump and see whether water comes out when the engine is running and the >>> pump is turning. If no water comes out, change the impeller. >>> >>> Alan Bergen >>> 35 Mk III Thirsty >>> Rose City YC >>> Portland, OR >>> >>> >>> On Fri, May 30, 2025 at 12:34 PM David Knecht via CnC-List < >>> cnc-list@cnc-list.com> wrote: >>> >>>> I noticed today when i turned the engine on that i could not hear water >>>> coming out the transom port. Just air bubbles. Also the temp gauge read >>>> zero which i am guessing would happen with no water near sensor. Opened >>>> intake strainer cap and water comes in when seacock is opened. Took cover >>>> off sherwood water pump and looks normal inside. No missing vanes. Opened >>>> seacock and water came out of hose from the intake. I’m stuck. Any ideas? >>>> C&c 34+ >>>> Universal m4-30 >>>> Thanks. >>>> >>> Your contributions help pay the fees associated with this list and help >>> to keep it active. Please help by making a small contribution using PayPal >>> at: >>> https://urldefense.com/v3/__https://www.paypal.com/paypalme/stumurray__;!!LIr3w8kk_Xxm!pZPXqf0N06PSxGS6nGO9KrBafHmmNbAHvV1qXeoJBQtWUzsqpX0o7OHRecZKK1B_ilJoRZ2G7haKXPI9iCONU2g$ >>> All contributions are greatly appreciated. >> >> Your contributions help pay the fees associated with this list and help >> to keep it active. Please help by making a small contribution using PayPal >> at: https://www.paypal.com/paypalme/stumurray >> <https://urldefense.com/v3/__https://www.paypal.com/paypalme/stumurray__;!!LIr3w8kk_Xxm!qDCB107FV545ldgV0tlZsQBNKnpSYz9z0E9zQPRdIsNRWQRwwuSzb6re2jDKQW-KijaHYMyaCaM47J4ZkqHtOaQ$> >> All contributions are greatly appreciated. >> >> Your contributions help pay the fees associated with this list and help >> to keep it active. Please help by making a small contribution using PayPal >> at: >> https://urldefense.com/v3/__https://www.paypal.com/paypalme/stumurray__;!!LIr3w8kk_Xxm!qDCB107FV545ldgV0tlZsQBNKnpSYz9z0E9zQPRdIsNRWQRwwuSzb6re2jDKQW-KijaHYMyaCaM47J4ZkqHtOaQ$ >> All contributions are greatly appreciated. > >
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