[C320-list] exhaust elbow question
Jeffrey Hare
catalina at thehares.com
Wed Oct 4 08:23:57 PDT 2006
Hi Guys,
Don't sweat the warmup/revving thing. Most agree you shouldn't load it
until it's warmed up, but reving a diesel after starting it in the summer is
simply a non-issue. In the middle of winter is a different story because
the oil doesn't flow well.
Revving a *Gas* engine that hasn't warmed up for a couple minutes in cool or
cold weather is a different story. Gasoline washes the oil off the cylinder
walls, while diesel doesn't really suffer from that phenomenon given that
Diesel fuel *is* oil.
Clean oil, clean air, and clean fuel, running it hard/fast it'll outlive
many of us.
-JeffH
-----Original Message-----
From: jonvez at comcast.net [mailto:jonvez at comcast.net]
Sent: Wednesday, October 04, 2006 10:52 AM
To: John Van Vessem; C320-List
Subject: Re: [C320-list] exhaust elbow question
John,
I am certainly not an expert on this, but the info. I received was from a
two day diesel class I took that was put on by Mack Boring....I guess I'm
back to being confused??
Regards,
Jon Vez
-------------- Original message --------------
From: John Van Vessem <jvanvessem at sbcglobal.net>
> Running a cold engine up to full RPM is probably the worse thing you can
do to
> any engine. The Yanmar manual says that you should run the engine up to
full
> throtle prior to shutting down, when the exhaust is hot and all bearings
are at
> their disign tolerance.
>
> John Van Vessem
> Sojourn 645
> Vallejo Yacht Club
>
>
>
> ----- Original Message ----
> From: jonvez at comcast.net
> To: Allan.Field at comcast.net; C320-List
> Sent: Wednesday, October 4, 2006 5:02:18 AM
> Subject: Re: [C320-list] exhaust elbow question
>
>
> Koen,
>
> I posted several questions related to the exhaust elbow as I was
interested in
> proactively replacing mine (my boat is in it's 8th season in salt water).
>
> My confusion was whether the elbow was custom made by Catalina like the
muffler,
> or whether I could get it from a Yanmar dealer--than answer is BOTH. Some
hulls
> (with the Yanmar) had a custom elbow made by Catalina...even though I
suspected
> this was the case on mine, I couldn't confirm until I went to a local
Yanmar
> distributor myself. Even Catalina couldn't answer this question....The
good news
> is that if you do have a custom elbow from Catalina, you can indeed
replace with
> a stock Yanmar elbow...The bad news is, you need to buy 3 pieces (for
about $360
> vs about $160 for just the elbow). The Catalina elbow is a one piece
elbow,
> whereas the stock parts have a manifold, an adjusting screw connector and
the
> elbow. Once you have replaced with the stock parts, you will only have to
> replace the elbow (top part) going forward....
>
> As for time, Mr. Douglas had suggested 5-8 seasons is a good time to
replace.
> One suggestion on keeping the buildup under control from Mack Boring is to
start
> the engine at full throttle and bring it back to idle as soon as the
engine
> starts...This will blow a lot of the build up out and presumably delay the
> inevitable...
>
> Regards,
>
> Jon Vez
>
> -------------- Original message --------------
> From: "Allan Field"
>
> > Koen - There are 2 concerns with the exhaust elbow. The first is that it
> > clogs over time and will impact engine performance. The second is that
it
> > eventually gets pinhole leaks. Both happened on my previous boat. Trust
me
> > when I say that you don't even want to think about the mess you will
have if
> > the elbow gets a pinhole leak. The engine compartment fills with black
soot
> > that never completely goes away no matter how much you clean, clean,
clean,
> > and clean some more.
> >
> > I intend to replace my elbow prophylactically over the winter at about
500
> > hours, change the hose to the aqua lift muffler, add a hump hose at the
> > muffler, and pull the muffler, send it back to Catalina, and have a
> > duplicate muffler made to sit on a shelf until when I need it. Again,
you
> > don't even want to think about the mess if these parts fail.
> >
> > Allan S. Field
> > Sea Shadow - #808
> > Columbia, MD
> >
> > -----Original Message-----
> > From: c320-list-bounces at catalina320.com
> > [mailto:c320-list-bounces at catalina320.com] On Behalf Of Koen Bennebroek
> > Sent: Tuesday, October 03, 2006 9:05 PM
> > To: c320-list at catalina320.com
> > Subject: [C320-list] exhaust elbow question
> >
> > I seem to remember someone mentioning that the exhaust elbows on C320's
get
> > clogged and are recommended to be replaced every so often..
> > My local mechanic, who will do the very first service on our boat soon
(so
> > we do not have experience either with him or with the engine
> > service in general), recommends we order the elbow and gasket from
Perkins
> > (I believe tadiesel sells them?) in advance to save time.
> >
> > Is this a good suggestion? We have purchased the boat used 2 seasons
ago, so
> > I have no idea what the history of this part is.
> >
> > Thanks for any suggestions,
> >
> > -Koen
> >
> >
> >
> >
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