[C320-list] Overheating alarm Yanmar 3ym30-2006-Hull #1089

[Robert Seastream]

I wonder what the difference is between the GM and YM.  I know the F =  
freshwater cooling.
I've got a 2002 with the 3GM30F as well.  I usually run her between  
2500-3000, with a temp of ~160.
I've gingerly maxed her out a few times at 3600 (specified '1 hour'  
rating) for up to 30 minutes.  Didn't blow up; temp never climbed  
above 190.

Bob Seastream
Intuition # 906


On Oct 6, 2008, at 3:20 PM, Jamie Pett wrote:

> Susan - We have a '99 C-320 with 3GM30F Yanmar.   I don't know how
> different the 3GM30F is from a 3YM30, so not sure my input is
> worthwhile.  (I believe the YM is a bit larger ? 29 hp vs. 27 in the  
> GM,
> so I assume it may be a totally different engine ?)
>
> I have owned her only this summer, but have motored the GM extensively
> without overheating at 3000 rpm - took delivery near Washington DC and
> motored the entire length of the Potomac and up the bay to Baltimore
> area without incident - 10 hour days or more.  She tends to run at  
> like
> 165 to 170 degrees depending on the surrounding water temp.
>
> Jamie Pett
> Bella Luna #614
>
>
>
> -----Original Message-----
> From: c320-list-bounces at lists.catalina320.com
> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of
> Moondancer5 at comcast.net
> Sent: Monday, October 06, 2008 3:01 PM
> To: c320-list at lists.catalina320.com
> Subject: Re: [C320-list] Overheating alarm Yanmar 3ym30-2006-Hull  
> #1089
>
> Hi all,
>
> Interesting that the issue is not isolated, I'll check the Google
> groups, thanks. Does anyone here regularly run this engine for any
> length of time @3000 and 'not' have an overheating issue?
>
> Of course, the way we found out the replaced sender switch didn't help
> was entertaining. A very experienced friend guided me thru our first
> exit of Barnegat Inlet, lovely calm water, not much breeze, beautiful
> except for the view of a sailboat smashed up on the south jetty...
> sailed around outside a bit... coming back in, the breeze had kicked  
> up,
> the current against us, and I was given a talk on how dangerous this  
> 300
> feet of inlet was, and how using full power to maintain course is
> important, and to give it full power now... and the overheating alarm
> went off on cue. I throttled down drastically, calmly handed the wheel
> to him to bring it in, barely making headway, and waited till we got
> back to the marina to go hide in the head and yell (with all gratitude
> to George Carlin): "F*#@ing meow!"
>
> Susan
>
>
>
> I have a 2004 C320 with the 3YM30.  I have been having over heating
> issues this year where anything above 2400 RPM drives temperature  
> above
> 180.  I understand 180 is the std operating temp.  I sail in cool
> northern BC waters, so I get a very standard intake temp for cooling
>
> I have had mechanics go through entire cooling system  and no issues
> were found. Only other symptom seems to be limited water  coming  
> through
> the exhaust system.  The exhaust system was also checked with no  
> visible
> issues.
>
> I have done some searches on the topic in the forum  and there are a
> couple of threads re this topic that seem  to have some suggestions
> based on various symptoms that you may recognize. I found a couple  
> that
> I will use to check things out
>
> Try Searching on at http://groups.google.com/group/c320-list
>
> Overheating
>
>
> Susan,
>
> I have a Yanmar 3YM-30, year 2005.  The first year all was fine.  The
> second
> year the engine overheated running at wide open throttle after 15
> minutes.
> It usually runs a temp of 180 degrees, but overheats when it hits 220
> degrees.  I was told I did not have to change antifreeze every year
> initially, but Yanmar told me I have to change it yearly even if it is
> Dexcool.  Since I have changed the antifreeze it does not overheat as
> easily.
>
>
> __
> Kurt R. Budelmann, M.D.
> Laurens County Medical Associates, P.A.
>