[C320-list] Overheating Engine

[Robert Seastream]

Joe, we're near brothers as I own hull 906.  We likely have the same  
(3GM30F) Yanmar engine.  It circulates raw seawater over a 'heat  
exchanger'.  That exchanger has the coolant/antifreeze in it.  If  
you're not seeing raw water expelled out of the discharge hull fitting  
I'd suspect the following in order:  The belt (is it slipping?), the  
impeller, or impeller housing (are they drawing water?).

As to your freshwater pump problems, I'd look at the pump input filter  
to see if it's clogged.  Sux to do, as Catalina placed the freshwater  
pump under the aft bunk.  If it's clear, then I'd suspect the pump  
itself.  I replaced mine because I wanted a pump with a higher GPM  
output...5.0 vs the 2.? of the original.

We're cruising Casco Bay for the next two weeks, but I can be reached  
(when in range) via my cell at 603-475-4410.  Where do you hail/sail  
from?

Bob Seastream WB2DWD
Intuition # 906


On Jul 6, 2011, at 5:27 PM, Pat Ireland wrote:

> Joe - What I know, I learned from this site.  Don't be discouraged.   
> It's
> been a busy weekend.
>
> Suggestion for what to do when no one answers immediately.  Go to the
> Catalina 320 International site and click on discussion.  There is a  
> link
> there to the forum posts.  On the upper right of that page is a  
> field to
> input your search criteria.   "engine cooling water"  or "no water" or
> "pressure water" are examples that might work.
>
> On the engine water problem - Was the water coming out of the  
> exhaust after
> you changed the impeller a strong or weak flow?  If it was weak, you
> may have a worn pump.  If it was strong, then something else like a  
> new clog
> may be the problem.
>
> Several owners have found that sand pulled into the pump has damaged  
> the
> impeller cover plate enough that replacement is required.  It may be
> possible to polish out scratches and grooves to get a bit of extra  
> life out
> of the cover.
>
> On the pressure water problem - if you are not seeing fresh water in  
> the
> bilge, you may have the water line valves turned off or the pump may  
> be
> plugged.  There is a screen in the pump intake that may have collected
> debris and need a cleaning.
>
> Good Luck
>
> Pat, 801
>
> On Wed, Jul 6, 2011 at 12:58 PM, Donald Lawson <dnclaws at aol.com>  
> wrote:
>
>> Joe
>> I sail/motor in  heavy kelp and eel grass infested areas. Clogs my  
>> intake
>> thruhull and filter and destroys my impellers.  I start at the thru  
>> hull,
>> intake filter and lines to the pump. If all clear pull the output  
>> line off
>> the pump, turn engine over and check pump output. If good then go  
>> to the
>> elbow in the exhaust riser, it might be plugged. If all of that is  
>> good
>> then???
>> Don #1005
>> On Jul 5, 2011, at 7:01 PM, Joseph Aberdale wrote:
>>
>>> Today I started the Yanmar engine in my 2002  C320 and the  
>>> overheating
>> light and alarm went on. I discovered that engine cooling water was  
>> not
>> being discharged from the hull but you could see the discharge of  
>> air.
>> Further investigation revealed that water was being drawn in  
>> through the
>> intake and getting to the engine. Is the likely problem the water  
>> pump? I
>> recently installed a new impeller and the engine ran well after  
>> that. How do
>> I determine if the water pump is bad?
>>>
>>> Also, I cannot get water to run out of the galley and bathroom  
>>> faucets.
>> The tanks are filled and I can hear the water pump operating but do  
>> not get
>> any running water. Any thoughts on how I should proceed from here?
>>>
>>> Thank you very much.
>>>
>>> Joe
>>> #908
>>>
>>
>>