[C320-list] exhaust elbow question

[jonvez at comcast.net]

Bruce,

You are right. The other piece of advice I received was to hold the starter up for 5 sec while turning the engine over to prelube and pressurize, especially after winter storage or long layups...This is the procedure I've been using ever since. 

Regards,

Jon Vezs

-------------- Original message -------------- 
From: "Bruce Heyman" <BruceHeyman at cox.net> 

> 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" 
> 
> > 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 
> > 
> > 
> > 
> > 
> 
> 
>