[C320-list] Overheating Engine

[Jeff Hare]

Yes, it's normal for water to come out the way you mention.  It has to do
with the way the water lift muffler works.  The water gets pumped in at the
top of the exhaust elbow, cooling the exhaust gasses a little and starts
filling the muffler.  As the water fills the muffler and flows into and
blocks the exhaust hose, the pressure blows the blocking water out of the
hose, cooling it some more.

-Jeff

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Joseph
Aberdale
Sent: Thursday, July 07, 2011 9:31 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Overheating Engine

Hi To All,

Thanks very much for your responses which were of great help.

The raw water intake and filter were clean. I removed the water pump output
hose and started the engine. The pump put out plenty of water and the belts
are not slipping. After several starts, I learned that if I start the engine
at mid to 3/4 throttle and let it run at that rpm for a minute, water is
expelled out of the discharge hull fitting.  I can then lower the throttle
and it will continue to discharge. However, if I start the engine at a low
throttle setting, water will not discharge from the hull without revving up
the engine to at least 1/2 throttle. Is this normal?

Also, regardless of the throttle setting, water discharges from the hull
fitting in spurts EVERY OTHER SECOND - NEVER A CONTINUOUS FLOW.  
Is this normal?

Regarding the fresh water failing to flow through the faucets.  I
disassembled the filter by the pump and found it all clogged up with gunk.
After cleaning it and reassembling the filter, water again refused to come
through the faucet. I disassembled the filter again and found it to be
completely blocked again. I obviously have to drain the water tanks to
remove the gunk. Is using a small pump attached to an electric drill the
easiest way to do that?

Thanks again for your responses.

Bob - I sail out of Wellfleet. Cape Cod.

Joe
#908

On Jul 6, 2011, at 9:28 PM, Robert Seastream wrote:

> 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
>>>>
>>>
>>>
>