[C320-list] Raw water system

[Warren Updike]

I don't know how you would tell what a good flow is from the output side.
Opening the input side accomplishes the following:(from experience with
Perkins M30)

O easier to determine an obstruction between the pump and upstream side of
the heat exchanger tubes;

O easier to remove the exchanger tubes for examination and cleaning.

When there are no obstructions on the input side the only other obstruction
would be in the mixing elbow, or a problem in the muffler/hoses.

Perhaps owners with other engines could elucidate.

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

-----Original Message-----
From: Irving Grunes [mailto:igrunes at gmail.com] 
Sent: Monday, January 11, 2010 8:08 PM
To: C320-List at catalina320.com
Subject: Re: [C320-list] Raw water system

It seems from all of the emails that the most important place to check
cooling water flow will be at the heat exchanger output.  It seems that that
is the most logical place to check after checking the impeller of the raw
water pump.
Irv Grunes
2001 #851

On Mon, Jan 11, 2010 at 8:02 PM, Warren Updike <wupdike at hotmail.com> wrote:

> After owning our #62 for about 2 years, I had a problem with cooling. I
> found about 7 impeller blades in the intake to the heat exchanger from the
> prior owner. Be sure to check that.
>
> 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: Monday, January 11, 2010 9:35 AM
> To: c320-list at lists.catalina320.com
> Subject: [C320-list] Raw water system
>
> Y'all, (I'm allowed to use that term as I'm in Georgia)
>
> Anyway...
>
> I have an issue with the raw water system.  It seems to work intermently!
>
> Yep...checked the sea cock (clear), strainer (clear) and impeller
(new)....
>
> What is next?  I'm assuming the raw rater pump itself (do these fail?),
> heat
> exchanger and the mixing elbow, but don't want to tackle those without
some
> indication either of these could be the culprit!
>
> Some history.  Once we smelled rubber burning like the pump stopped
> rotation.  After checking this and tightening the belt all was OK.  A
> couple
> of other times there was no exhaust water, but the next time there was!
> After the last sail, all was OK.  But starting the boat at the dock now
> results in no flow at all.
>
> Ideas?
>
> Thanks,
>
> Jim #453
>
>