[C320-list] Overheating Engine

[Robert Seastream]

I don't know how it's attached (welded, set screw, etc.) but wonder if  
the belt pulley is 'slipping' around the spindle that goes through the  
pump housing to the impeller?  That could produce a scenario like Joe  
describes.  If welded, he's replacing the pump assembly anyway, but if  
it's a set screw or similar, it could be tightened.

Bob

On Jul 8, 2011, at 10:10 PM, Jeff Hare wrote:

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