[C320-list] cooling water system

[warren updike]

Once, as a result of overheating, in a strong following sea, I inspected the
impeller. It, too, was in one piece. The old stomach wouldn't tolerate me
being down there too long. Later, after inspecting the full length of the
cooling system including the heat exchanger tubing, I came back to the
impeller to find small cracks in 2-3 of the impeller arms. It wasn't enough
to pull the impeller, I should have flexed the blades to find the breaks.

Warren & Pattie Updike
Catalina 320, #62, "Warr De Mar"
Middle River, Chesapeake Bay



-----Original Message-----
From: james_delong [mailto:james_delong at bellsouth.net] 
Sent: Saturday, December 20, 2008 4:02 PM
To: List Catalina
Subject: [C320-list] cooling water system

Next step please...

My Yanmar overheated the other day and we had to limp in to the dock.

Checked the intake seacock, cleaned the strainer, and hoses to the pump. All
ok. Pulled the pump and checked the impeller. Still in one piece.

I guess the heat exchanger is the next step. What is the process to inspect
it and what should I look for?

This problem appeared abruptly. Was OK the previous time out, but this last
time, limited water flow and when I started it today...nothing!

Thanks for all advise!!

Jim #453