[C320-list] Exhaust elbow... Herb right!

[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: "bkuether at comcast.net" <bkuether at comcast.net>
To: C320-List at Catalina320.com
Sent: Mon, March 14, 2011 2:25:43 PM
Subject: Re: [C320-list] Exhaust elbow... Herb right!



Actually I knew that.... 



When it is running it is running at higher RPMs.  But I don't use it that often 
I would rather sail.  Regardless if I am drifting or not.....  I drive it fairly 
hard to get out and hard to get back.  But in between I just "sail".  And it 
only idles in the slip when it is cooling down and only for like 4 or 5 mins. 




That is actually the point I was trying to make.  



I may actually have the 3ym30 overheating issue.  I have seen the temp go up 
above 180 when I get close to 2800.... 




We should have a 320 regatta out of Middle River some time.  Bruce, Warren, 
Herb, and myself and anyone else there..... 





----- Original Message ----- 
From: jpmesa at aol.com 
To: C320-List at Catalina320.com 
Sent: Monday, March 14, 2011 1:51:23 PM 
Subject: Re: [C320-list] Exhaust elbow... Herb right! 

Herb is right!  How many times have I seen people run their engine (in neutral) 
in the slip for a hour or more. That is the kinda thing that will ruin a diesel 
engine and the elbow.   JOHN   HOLOKAI 2 





-----Original Message----- 
From: hcreech at comcast.net 
To: C320-List at Catalina320.com 
Sent: Mon, Mar 14, 2011 6:09 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