Hi joel. No check valve i know of. Never had this apart before but nothing obvious. Almost have strainer out. Of course the last hose clamp is frozen. Pb blaster to the rescue. DaveSent from my iPhone On Jun 5, 2025, at 4:56 PM, Joel Aronson via CnC-List <cnc-list@cnc-list.com> wrote:
Is there a check valve in the line before the water pump? Could hose be old and collapsing?
Update. Diver confirmed nothing blocking thru hull. So with seacock open water flows strongly out of strainer with lid removed. But it dribbles slowly out of raw water pump inlet hose. The only thing in between is raw water strainer. Basket is clean. Not sure how to assess water flow through it but suppose i will have to remove it. Major inaccessible pita. Dave Sent from my iPhone
It’s more likely to suck air and not pump.
Fyi. I am on my mooring so some ideas aren’t practical. Dave
Sent from my iPhone
Hi john. Wouldn’t the pump be leaking water if seal is bad? Dave
Sent from my iPhone
Impeller gasket must make a perfect seal.
Air might be getting in without water leaking. It happened to me once, and it took me a while to figure it out.
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
If the cap on the raw water strainer doesn't have a tight seal, you won't get water pumping.
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
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
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
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.
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