I usually start by pulling the discharge water hose at the elbow.  If there's 
good flow there, it's the elbow.  If not, move further upstream.

Dennis C.




>________________________________
> From: Steve Thomas <sthom...@sympatico.ca>
>To: cnc-list@cnc-list.com 
>Sent: Tuesday, September 11, 2012 2:53 PM
>Subject: Re: Stus-List Yanmar question
> 
>
> 
>Earlier 
someone recommended a thorough check for clogs in the system 
first.
>I would 
second that advice.
>Thought I had 
an elbow or water injector problem once but it turned out to be a partial 
sea water clog that was entirely confined to the hose barb going in to the sea 
water strainer. 
>Couldn't see 
it. Took off the hoses, took off the bowl, all seemed ok. 
>Thermostat 
was stuck, so I ordered a new one. 
>The top part 
of the strainer was secured to the boat, and I didn't take it off until much 
later, which made the problem relatively easy to see.
>Partial flows 
can be deceptive. 
> 
>Steve 
Thomas
>C&C27 
MKIII
> 
> 
>-----Original Message-----
>From: cnc-list-boun...@cnc-list.com [mailto:cnc-list-boun...@cnc-list.com]On 
>Behalf 
Of jim aridas
>Sent: Tuesday, September 11, 2012 3:31 
PM
>To: capt...@yahoo.com; cnc-list
>Subject: Re: Stus-List 
Yanmar question
>
>
>Humm, knew we would get at least one witty response. 
>
>
>Thank you all for the info. Figured it sounded like constricted flow. Gonna 
get the elbow and nipple replacements first. Then pull it apart
>and replace them. Agree no sense putting back the old ones.
>thanks again,
>Jim
>Galaxy 34'
>
>
>
>
>________________________________
> Date: Mon, 10 Sep 2012 20:11:19 -0700
>From: capt...@yahoo.com
>To: 
cnc-list@cnc-list.com
>Subject: Re: Stus-List Yanmar question
>
>
>Jake wrote:
>
>
>
>  "I always check the nipples 
first!" <snip>
>
>
>
>I'm 
a leg man myself.
>
>
>Dennis 
C.
>
>
>
>>________________________________
>> From: Jake Brodersen  <captain_j...@cox.net>
>>To: cnc-list@cnc-list.com 
>>Sent: Monday, September 10, 2012 7:06  PM
>>Subject: Re: Stus-List  Yanmar question
>>
>>
>> 
>>Jim,
>> 
>>There  are ample opportunities for problems in the raw water cooling system.  
>> The easiest to check is the nipple on the exhaust elbow.  If it was  
>>installed with some never seize lube, it should be easy to remove and  
>>check.  They do tend to gum up with salt deposits from time to  time.  I 
>>always check the nipples first!
>> 
>>The  next most likely suspect would be a clogged exhaust elbow.  I have  
>>removed mine in the past and cleaned it out with a coat hanger.  No  pretty, 
>>but it may buy you a year or two.  Replacement is the best course  of action, 
>>especially since you have it off already.
>> 
>>I  removed my heat exchanger and had it hot tanked a number of years ago.   
>>It wasn’t in bad shape, but now I feel better about it.
>> 
>>Good  raw water flow will keep your exhaust quiet.  That’s how I can tell my  
>>system needs attention, by the change in sound.  I switched from the SS  
>>stock muffler to a smaller fiberglass muffler a couple years ago.  It  sounds 
>>great.  Not loud, but nice an mellow.
>> 
>>Jake
>> 
>>Jake  Brodersen
>>C&C  35 Mk-III
>>"Midnight  Mistress
>>Hampton  VA
>>
>> 
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