[C320-list] Overheating 3YM30

[Warren Updike]

Brad, first I would question the accuracy of various temp gages.  58 deg in
Puget Sound vs. 80+ in the Chesapeake, a diff of as much as 25 deg will
definitely make a diff in your operating temp. For what it's worth, my
Perkins runs at 180 at 2700rpm in the warm bay. You might want to collect
some water from the exhaust and stick a thermometer in it. 

As for the Yanmar recall on the H/E, check with Salty Dog down the dock. He
did the recall on his.  I don't know if his is the same model as yours.
Call me 410-821-8246, I'll give you  his phone and e-mail.
Warren

-----Original Message-----
From: Brad Kuether [mailto:bkuether at comcast.net] 
Sent: Tuesday, August 23, 2011 8:14 AM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Overheating 3YM30

Apparently there was a Yanmar recall for heat exchangers.

I don't relish taking my boat to Annapolis to do this.  At least not in the 
hot summer.

----- Original Message ----- 
From: "Donald Lawson" <dnclaws at aol.com>
To: <C320-List at Catalina320.com>
Sent: Monday, August 22, 2011 11:08 PM
Subject: Re: [C320-list] Overheating 3YM30


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