[C320-list] exhaust elbow question

[jonvez at comcast.net]

Jeff,

I think you have the right perspective...The same mechanic/trainer also said, anything you do to these engines may be a matter of whether you rebuild it after 4000 hours or 10,000 hours-- at 50-100 hours a year, either way, it's a loooong time and a lot of abuse.....

Regards,

Jon Vez

-------------- Original message -------------- 
From: "Jeffrey Hare" <catalina at thehares.com> 

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