[C320-list] Running engine with seacock off?

[Graeme Clark]

Jeff

Yes the fresh coolant circuit wouldn’t be affected. As you say the impeller will have run dry (and if it’s fragmented possibly block the heat exchanger) but my main worry was uncooled exhaust gas into the exhaust hose
I put a new hose on about two years ago and as I recall as well as being wire reinforced they’re pretty thick. They won’t be under great pressure either I guess
Graeme

Sent from my phone. Excuse typos! 

> On 3 Aug 2020, at 20:42, Jeff Smith <jeffreyssmith at live.com> wrote:
> 
> Graeme,
> 
> I had a similar experience, though my experience may not help you. I changed the coolant in the engine but apparently did not grab the "neck" when I tightened the clamp. The Admiral is at the helm as we motor out. She asks me "what is that noise?" I don't know; I am trying to get the sails ready. I finally hear it and realize that something is horribly wrong.  I go downstairs and all of the coolant is in the bilge. We had probably idled for a few minutes and then motored for another 5 - 10. As soon as I realized the problem, we raised the sails; I reattached the hose, and then filled the radiator with fresh water. I let the engine cool naturally because I wanted to limit the amount of time running with just water. Got it back to the dock, replaced coolant. I have not had a cooling problem since then. 
> 
> The raw water hoses can be easily replaced, though I would not suspect any damage to them. The exhaust hose will not come off without a fight. If it has been awhile, plan to change it if you want to check it. I replaced my exhaust hose this spring and installed the Catalina hump hose. My exhaust hose was cooked and brittle, probably original equipment and unrelated to my issue. It was not reusable after I removed it, though.
> 
> I think the most likely thing to happen will be your raw water impeller might be shredded. I would pull it and replace it. Even if it looks okay from a visual inspection, you have no way of knowing if it is cracked or weakened, until it goes. Of course, Parts4engines.com over your way sells impellers at a great price.
> 
> Good luck,
> 
> Jeff
> '94, #121
> 
> 
> 
> 
> On 8/3/20, 3:19 PM, "C320-list on behalf of Graeme Clark" <c320-list-bounces at lists.catalina320.com on behalf of cg at skyflyer.co.uk> wrote:
> 
>    Oops
>    Finally did it
>    Started the engine and let it idle for a few minutes then slipped my lines and gently motored off
>    Suddenly realised I hadn’t turned on the seawater cooling seacock
>    Turned it on. Water coming out of exhaust. No external signs of damage to exhaust hose or water muffler
>    But will there be internal damage?
>    Am I risking sudden hose rupture for example?
>    As I recall it’s nigh on impossible to remove hoses without damaging them
>    Ideas?
>    Graeme
>    #366
>    1996
>    Falmouth
>    England
> 
>    Sent from my phone. Excuse typos! 
> 
>