[C320-list] cooling water system //// Some trouble shooting questions and steps

[Pete Herron]

If the pump is pumping but you have little or no water exiting the 
exhaust port and you are in salt water, you might check the vented loop 
that runs from the heat exchanger to the vent (mine is mounted in the 
port locker) and back to the exhaust elbow.  Salt can accumulate at the 
low point in the line and block the water flow.

Pete
Dreamtime #329


On Dec 20, 2008, at 3:28 PM, Rick Sulewski wrote:

> Just some thoughts about the cooling issue:
>
> Is there water exiting the exhaust port? If so, then there is no 
> blockage I
> expect. It is possible that the heat exchanger could be breached but I
> expect that the internal cooling system fluids (antifreeze) would then 
> be
> compromised as a result and one then expect that the level of the 
> antifreeze
> would reflect a lower level if not dilution.
>
> If you are pumping water out the exhaust port and the overheating is
> considerable as like in spit jumping off the surface of the engine 
> block,
> then there may be some issues with the internal cooling system and 
> begin
> with checking the tension on the fan belt. Next consider check the
> thermostat to see if it opening by pulling it out and placing it in a 
> pan of
> water to see if it opens before the water boils.
>
> If you do not have evidence of the engine overheating other than the 
> alarm
> or temp gauge going off, it is possible that the gauge and/or alarm 
> system
> are malfunctioning.  I once had a pinched temp sender wire that 
> grounded and
> indicated that the engine was overheating when it was not.
>
> After checking the items above I would then consider pulling the heat
> exchanger.
>
> Rick
> My-Ria 277
>
>
>
> -----Original Message-----
> From: c320-list-bounces at lists.catalina320.com
> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Robert E.
> Sloat
> Sent: Saturday, December 20, 2008 5:37 PM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] cooling water system
>
> Jim-Before tackling heat exchanger removal for clean up, check to see 
> if the
>
> fresh water pump is working.  Even with a good looking impeller, I 
> would
> disconnect the discharge hose from the pump at the exchanger and then 
> have
> someone see if it pumps water into a bucket when you briefly run the 
> engine.
>
> If water is coming out then you have a blockage in the exchanger or 
> severe
> fouling.  Don't run the engine too much or you might damage the lift 
> muffler
>
> since there is no cooling water available.
>
> Bob Sloat
> Savannan Hull 894
> ----- Original Message -----
> From: "james_delong" <james_delong at bellsouth.net>
> To: "List Catalina" <c320-list at catalina320.org>
> Sent: Saturday, December 20, 2008 3:01 PM
> 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
>
>
>