[C320-list] Changing seawater pump impeller - how much water?

[Robert E. Sloat]

Martin-I have hull 894 with a Yanmar 3GM30F engine.  The sea water pump has 
two hoses attached to it.  One comes from the thru hull and one goes to the 
heat exchanger.  I believe your sea water pump has a similar set up.  I just 
remove the pump from the two hoses and change the impeller from a 
comfortable location.  Just close the sea water thru hull and plug the hose 
going to the heat echanger.  Then you can spend as much time as you want 
changing the impeller with less than a cupfull of water to deal with.

Bob Sloat
Savannah 894
----- Original Message ----- 
From: "Martin Bayly" <mbayly at telus.net>
To: <C320-List at Catalina320.com>
Sent: Monday, April 20, 2009 12:36 PM
Subject: [C320-list] Changing seawater pump impeller - how much water?


> Decided to have a go at changing the impeller on the seawater pump for the
> cooling system on my Yanmar 3YM30 over the weekend.
>
>
>
> Loosened off the screws on the cover plate with a bowl underneath to catch
> the water.   But the water just kept coming, seemingly from the outflow 
> side
> of the pump (yes, I did have the inlet seawater cock off -checked about 3
> times!)
>
> So my question is, does anyone know how much seawater the heat exchange
> holds or is there something else I'm missing.   It seemed like there was 
> in
> excess of 8-9 litres (quarts) in there and that's when I gave up and put 
> it
> back together again, as it didn't seem to be showing any signs of abating.
>
>
>
> Cheers
>
> Martin
>
> Serendipity #1023
>
>
>