[C320-list] Fwd: Re: exhaust mixing elbow

[Karl Mielenhausen _/)]

Crosby,

My experiences and operating procedures are similar to Bob's and Allan's.  
I try not to motor under 2400 rpm for extended periods of time and if I  
do, I run the engine up to 3400-3600 rpm for a few minutes every half hour  
or so. I also add Algae-X to my fuel (adds lubricity) even though we are  
still able to get low sulfur diesel (NC hasn't mandated the ultra low  
sulfur diesel yet for boating or off-road use).

I did recently pull my elbow and exhaust line to the Aqualift muffler,  
thinking I might need to clean same. They looked great, just a thin  
coating of carbon. Pics are posted here...
http://www.catalina320.com/gallery/album94

Karl

------- Forwarded message -------
From: "Robert Seastream" <robert.seastream at comcast.net>
To: C320-List at catalina320.com
Cc:
Subject: Re: [C320-list] exhaust mixing elbow
Date: Fri, 19 Sep 2008 20:12:57 -0400

We have about an hour run to get downriver and out of Portsmouth
harbor to offshore.  We run at 2400 for fuel economy, 3000 if we have
to hustle to make the bridge openings.  3200 is the continuous max
rating for our Yanmar 3GM30F.  Once or twice a year, I run WOT (3600
rpm; coincides with the one hour engine rating) for about 15 minutes.
Never had 'smoke' issues, however our engine only has about 300 hours
on it.  Engine temps range from 160 to 180 degrees farenheit under
those respective conditions.

Bob Seastream
Intuition # 906

On Sep 19, 2008, at 6:04 PM, Allan S. Field wrote:

> We make sure that every time we run the engine, we run at 3,000 rpm
> for at
> least 5 minutes.  600 hours and no smoke although we intend to pull
> and
> clean the elbow prophylactically this winter regardless.
>
> Allan S. Field
> Sea Shadow - #808
> Columbia, MD
>
> -----Original Message-----
> From: c320-list-bounces at lists.catalina320.com
> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Crosby
> Roper
> Sent: Friday, September 19, 2008 5:42 PM
> To: c320-list at catalina320.org
> Subject: [C320-list] exhaust mixing elbow
>
> Thought I'd pass this along for general lesson learned file. In july
> on my
> way back from Catalina island to San Diego, I noticed that when I
> ran the
> RPM's up to 3200, I got a bit of black/brown smoke from exhaust.
> Since water
> tanks were full and there was a bunch of stuff on board, I figured
> probably
> just overloading the engine was the problem. On my next trip to
> catalina on
> Labor day, I noted smoke at 3000 RPM. To make a long story short, the
> problem progressed rap[idly over the next 30 hrs of engine use to
> the point
> where even at 2000 RPM i was seeing smoke. We limped back to the
> slip and
> called mechanic ( to whom I had spoken while in Catalina and who had
> advised
> me that problem was likely a clogged exhaust mixing elbow and OK to
> run
> engine at low RPM as long as it was not producing smoke.) He came
> out on
> Monday and problem was indeed exhaust mixing elbow. The engine is 3
> years
> old and has about 220 hrs on it. He admonished me for not using the
> boat
> enough (in front of my wife, which should work out well for future
> sailing
> schedule) and for babying the engine. So, for anyone else who tends
> to baby
> their diesel, run it frequently and run it hard. But we already know
> that!Crosby Roper, VMD
> Tethys # 1054
> _________________________________________________________________
> See how Windows connects the people, information, and fun that are
> part of
> your life.
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>



-- 
Karl Mielenhausen
Catalina 320 Hull 690
New Bern, NC
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