[C320-list] Exhaust elbow

[jim brown]

I took the Mack Boring diesel course a couple of months ago. They emphasized 
over and over to run the engine "like a motorboat" at least once a month 
(assuming normal usage). That meant hull speed rpms (about 3000) for at least an 
hour.  The second thing they emphasized was a prop that would allow that to 
happen. With the wrong prop it can't be done. They said that most exhaust elbow 
problems were due to long slow slogs.

Jim Brown




________________________________
From: "hcreech at comcast.net" <hcreech at comcast.net>
To: C320-List at Catalina320.com
Sent: Mon, March 14, 2011 9:09:59 AM
Subject: Re: [C320-list] Exhaust elbow

Brad, 
One observation I have made on this list is that most baby their diesels. My 
hull 606 is entering its 12th season with the original elbow. When I first 
bought the boat I took a diesel class, the main thing they stressed was not to 
baby their diesel. I run mine at 2800 RPM's at cruising speed and occasionally 
up to 3100 but only for a brief time. The diesel instructor told us the 3100 is 
fine for up to a hour of run time. I have got to believe the constant lower 
speeds, meant to protect the engine, is actually creating problems. Lower 
speeds, therefore lower temperatures, cause carbon build up. 



Herb Creech 
Cloud Chaser 
Middle River , MD 



----- Original Message ----- 
From: "Brad Kuether" <bkuether at comcast.net> 
To: C320-List at Catalina320.com 
Sent: Monday, March 14, 2011 8:21:38 AM 
Subject: Re: [C320-list] Exhaust elbow 

Peter, 

Guessing your prop was clean. 

Seems kinda odd that your elbow is clogged this early in the game. I have 
hull 1006 with 310 hours and not seeing anything. Not saying it isn't but 
just one of those, "really" type things. The Yanmar 2GM I had on my 
previous C&C went 25 years without any issues. 

Now for both boats I have been a "purist" only motoring when I have too..... 

Let us know how it goes. With my luck I will find myself in the same 
situation this, looking back going, "shoulda just said nothin!" 

Good luck and take pictures, please. :) 

-Brad, Mary, Monica, and Jarod 
"Independence" 
2004 Catalina 320 Hull 1006 
Middle River, MD 

----- Original Message ----- 
From: "P & B Sheerin" <sheerinp at bigpond.net.au> 
To: <C320-List at Catalina320.com> 
Sent: Monday, March 14, 2011 7:52 AM 
Subject: [C320-list] Exhaust elbow 


Anyone have any experience on changing exhaust elbow, or replacing 3ym30 
current cast one for a stainless steel job. 
Need to replace mine. 
Peter "Jaraman" # 1096