[C320-list] exhaust elbow question

[Rod Boer]

Hi Bruce,

I hold the engine kill knob when starting after the engine has been sitting 
for a couple or more weeks unused.  I do run the engine full throttle before 
shutting it down.  On some of the bigger diesels they recommend running the 
oil circulation pump for a while before starting.

Rod Boer
Odyssey, #688

----- Original Message ----- 
From: "Bruce Heyman" <BruceHeyman at cox.net>
To: "'C320-List'" <c320-list at catalina320.com>
Sent: Wednesday, October 04, 2006 10:15 AM
Subject: Re: [C320-list] exhaust elbow question


> Jon,
>
> Thanks for the research, will be very helpful.
>
> On the starting I've learned that for most engines and diesels in 
> particular
> the most wear to bearings, sleeves, rings.... is when the engine first
> starts up.  The reason is that the lubrication system is not yet 
> pressurized
> so many parts are running without the film that protects them.
>
> Some people actually turn the engine over with the starter while holding 
> the
> engine kill knob until the low oil pressure alarm shuts of and then let 
> the
> engine start.
>
> Starting at full throttle and then cutting it back seems like it would be
> pretty hard on the engine.
>
> I'm anything but an expert so interested in everyone's thoughts.
>
> Bruce
> Somerset 670 SoCal
>
> -----Original Message-----
> From: c320-list-bounces at catalina320.com
> [mailto:c320-list-bounces at catalina320.com] On Behalf Of jonvez at comcast.net
> Sent: Wednesday, October 04, 2006 5:02 AM
> To: Allan.Field at comcast.net; C320-List
> 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" <Allan.Field at comcast.net>
>
>> 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
>>
>>
>>
>>
>
>
>