[C320-list] Overheating 3YM30

[Donald Lawson]

I run at about 160 at 2100 and push 170 at 2800 rpm on my 3YM30.  I am a second owner. What recall?
Don #1005

On Aug 22, 2011, at 7:39 PM, Brad Kuether wrote:

> Hey David (and anyone else with the 3YM) what is "hot"?
> 
> I have the 3ym30 and I am pushing 180 when running at 2100 or higher. Something tells me this can't be right.
> 
> I know the water has gotten warmer, but I was running 165 in the spring.
> 
> No blockage in the strainer, impeller brand new every year, what are my next steps?
> 
> I don't know if I am eligible for the recall or not, but do want to take care of it so I don't have to worry anymore.
> 
> -Brad, Mary, Monica, and Jarod
> "Independence"
> 2004 Catalina 320 Hull 1006
> Middle River, MD
> 
> ----- Original Message ----- From: "Henderson, David" <dhender at allstate.com>
> To: <c320-list at lists.catalina320.com>
> Sent: Monday, August 22, 2011 5:16 PM
> Subject: Re: [C320-list] Overheating
> 
> 
> Jack, This may be too unique and obscure to be of general value, but on
> the off chance you or others may benefit, here's a recent experience of
> mine.  I have suffered from overheating and running hot for years on my
> 2005 with a 3YM30.  I have replaced numerous impellers and opened and
> checked the exchanger to no avail.  Next on my to do list is replacing
> the thermostat and checking the exhaust elbow, neither of which have I
> gotten around to just yet.  But my "Aha moment" came this spring when it
> overheated shortly after launching.  I have often found seaweed clogs in
> the hose between intake and strainer (sometimes I feel like my system is
> some kind of seaweed magnet!).  After removing the intake hose and
> confirming it was clear, and checking impeller which was fine, I pushed
> my finger into the strainer at the intake, outflow points as far as I
> could and felt nothing there.  Not satisfied, I next unbolted the black
> strainer housing from the bulkhead and held it up to the light to look
> into the intake side, and what did I find but a little almost round,
> black piece of something wedged in there tightly.  It almost looked like
> a little bit of pea-stone, or a small acorn, but my guess is that it was
> one of those little nodules you see on some seaweed.  And it was just
> oddly shaped enough that some water was likely passing around it but not
> nearly enough. Since removing this obstruction, flow has improved
> dramatically - obviously - but I guess the real point of the story is
> that you have to check every inch of the system, and every nook and
> cranny where debris could possibly hide or get stuck.
> 
> I still run a little too hot, so that thermostat and heat exchanger are
> definitely next.  Good luck.
> 
> Dave H.
> Dottie B  #1049
> 
> 
> 
> 
> Message: 1
> Date: Sun, 21 Aug 2011 16:58:24 -0400
> From: "Jack McDonough" <mcdonough5 at verizon.net>
> To: <C320-List at Catalina320.com>
> Subject: Re: [C320-list] Overheating
> Message-ID: <0585B6597A58431A82DFD2636058007E at johnf12eb04ca6>
> Content-Type: text/plain; format=flowed; charset=iso-8859-1;
> reply-type=original
> 
> Warren & Lew:
> 
> Yeh, I did check the heat exchanger, expecting to find that "aha"moment.
> 
> But -- nothing there. I opened both the front and back. Now, however,
> the
> engine pumps raw water like a champ. I'm now in the "if it ain't broke
> don't
> fix it" frame of mind.
> 
> jack
> #947
> 
> 
> ----- Original Message ----- From: "Warren Updike" <wupdike at hotmail.com>
> To: <C320-List at Catalina320.com>
> Sent: Friday, August 19, 2011 4:34 PM
> Subject: Re: [C320-list] Overheating
> 
> 
>> So, you probably have a Yanmar. Ours is a Perkins. I'm not sure there
> is a
>> difference re. lost impeller vanes.  Here is my story.  Bought the
> boat in
>> '04. No problem for three years. Then, on a cruise, engine began to
>> overheat, of course with a 20kt following wind. Turns out there were
> at
>> least 4 blades in the front of the heat exchanger. None of them were
> from
>> my
>> tenure. So, surely it is possible to have old blades in the heat
> exchange
>> and not cause a problem until you are in the most inconvenient
> situation
>> for
>> the problem to occur.
>> 
>> Warren & Pattie Updike
>> 1994 C320 #62 "Warr De Mar"
>> 
>> -----Original Message-----
>> From: Dennis Harris [mailto:dharris02 at suddenlink.net]
>> Sent: Monday, August 15, 2011 2:04 PM
>> To: C320-List at Catalina320.com
>> Subject: Re: [C320-list] Overheating
>> 
>> Just a thought...could it be that a broken water pump vane or other
> debris
>> is in the exit end of the heat exchanger?  It could be loose so it
> moves
>> around but big enough to stop water flow out the exit if it stops
> across
>> the
>> 
>> outlet opening.  On time, water turbulence moves it away from outlet
>> opening
>> 
>> and you get normal pumping/water flow.  Next time, turbulence moves it
> so
>> that it blocks the outlet, in which case, you get no flow and steam.
>> 
>> Dennis Harris C320 694.
>> 
>> ----- Original Message ----- From: "Jack McDonough" <mcdonough5 at verizon.net>
>> To: <C320-List at Catalina320.com>
>> Sent: Monday, August 15, 2011 11:50 AM
>> Subject: Re: [C320-list] Overheating
>> 
>> 
>>> Dave:
>>> 
>>> Yes, you may be right. The trouble may well be downstream. I was
> hoping I
>>> could avoid pulling more stuff apart but I guess I'll have to bite
> the
>>> bullet. Thanks for the suggestions.
>>> 
>>> jack
>>> 
>>> 
>>> 
>>> ----- Original Message ----- From: "Utility Email" <kswanson123 at comcast.net>
>>> To: <C320-List at Catalina320.com>
>>> Sent: Monday, August 15, 2011 11:05 AM
>>> Subject: Re: [C320-list] Overheating
>>> 
>>> 
>>>> Could there be a partial blockage in the mixing elbow or a partial
>>>> blockage upstream of the strainer?  It sounds like you have
> thoroughly
>>>> checked upstream of the pump, perhaps checking downstream might find
> the
>>>> culprit?  If it came on suddenly, that would point to some type of
>>>> marine
>> 
>>>> life blockage was ingested, but of the strainer is clear, then it
> would
>>>> have to be upstream from that. I am guessing:
>>>> 
>>>> 1. That the mixing elbow may have carbon/corrosion build up.
>>>> 2.  Water pump is not functioning adequately at low speeds.  I'm
>>>> guessing
>> 
>>>> that the water pump is not providing enough head to force water
> through
>>>> the system. Seems like there could e a easy way to test this buy
>>>> connecting a long clear hose between the pump outlet and the engine.
>>>> 
>>>> Dave Swanson
>>>> S/V Emily Ann
>>>> 2007 C320 MK II, No. 1107
>>>> Mukilteo, WA
>>>> 
>>>> On Aug 15, 2011, at 6:13 AM, hcreech at comcast.net wrote:
>>>> 
>>>>> Jack,
>>>>> Unless I am reading this wrong you are running your engine at too
> low a
>>>>> rate of speed. This should not have any bearing on the water pump
>>>>> situation but still way too low. If you continue to run at that low
>>>>> speed you will only create a carbon build-up which is not good. I
> run
>>>>> mine continuously while crusing a 2800 RPM and only lower speeds
> while
>>>>> docking. When I took the initial diesel class they stressed that
> low
>>>>> speeds are very detrimental to diesels. They went on to say you
> should
>>>>> cruise at 2800-2900 RPM and can run at 3100 RPM for up to an hour
>>>>> without causing any problems. The main point was to "Not Baby" the
>>>>> diesel. Could be another problem, but regardless, if I am reading
> this
>>>>> right, you need to crank it up.
>>>>> 
>>>>> Herb Creech
>>>>> Cloud Chaser 606
>>>>> 
>>>>> 
>>>>> 
>>>>> ----- Original Message -----
>>>>> From: "Jack McDonough" <mcdonough5 at verizon.net>
>>>>> To: C320-List at Catalina320.com
>>>>> Sent: Monday, August 15, 2011 8:47:20 AM
>>>>> Subject: [C320-list] Overheating
>>>>> 
>>>>> A puzzling, intermittent overheating problem developed a couple of
>>>>> weeks
>> 
>>>>> ago with the 3GM30F Yanmar in my 2003 C-320.
>>>>> 
>>>>> While traveling at low speed from an anchorage to a newly available
>>>>> mooring one morning (maybe 10 - 15 minutes running time), the
> engine
>>>>> overheat alarm sounded. I managed to pick up the mooring, after
> which I
>>>>> pulled the raw water intake hose at the seacock and determined that
>>>>> water was, in fact, coming into the system. I then checked to see
> that
>>>>> the strainer was clear and, finally, took apart the impeller
> housing
>>>>> and
>> 
>>>>> inspected the impeller -- which was newly installed in May and
> which
>>>>> looked fine. I started the engine again and still got only steam
> out of
>>>>> the exhaust. A couple of tries later, however, the system once
> again
>>>>> pumped out water like a champ.
>>>>> 
>>>>> I made a three-hour passage to another harbor under power the next
> day
>>>>> and everything was fine -- but the same problem occurred the
> following
>>>>> day. Again it blew steam -- but the following morning I got a
> healthy
>>>>> flow of water and headed home.
>>>>> 
>>>>> Since then, I have again pulled the hose off the intake seacock
> but,
>>>>> this time, I took my digital wire coat hanger and fed it down
> through
>>>>> the intake passage to make sure there was nothing flopping around
> in
>>>>> there. I disconnected the other end of the hose -- at the strainer
> --
>>>>> and detemined that there was nothing in the hose. Then I removed
> the
>>>>> hose between the strainer and the impeller and confirmed that it,
> too,
>>>>> was clear.
>>>>> 
>>>>> I have a sense that I'm more likely to be able to pump water if I
>>>>> briefly goose the RPMs up to 2000 or a little more. But I've
> consulted
>>>>> my diesel guy and he says that shouldn't make any difference. It
> should
>>>>> pump water regardless.
>>>>> 
>>>>> That's my story. Any ideas?
>>>>> 
>>>>> Jack
>>>>> #947
>>> 
>>> 
>> 
>> 
>> 
> 
> 
> 
>