[C320-list] Exhaust Riser Elbow & inward flange - Key West

[A. R. Gates]

Jim & Allan,
Our 1995 Perkins M30 with 300 hours also has a short rigid hose.  Our typical usage is low rpm's less than a mile to open water sailing & back, so low rpm vibration could be the major cause of the cracks.  The Marine Tex fix withstood 20 hours of motor sailing in the 175 mile return from the Keys.  I will look for a Ft. Myers, FL area fabricator and follow Jim's approach for the muffler and the hump hose as well.  Thanks, Rollie  #182

-----Original Message-----
>From: Allan Field <Allan.Field at comcast.net>
>Sent: May 4, 2006 3:51 PM
>To: 'C320-List' <C320-List at catalina320.com>
>Subject: Re: [C320-list] Exhaust Riser Elbow & inward flange - Key West
>
>Jim - In the Sea Shadow album on the C320 website is a picture of a "hump
>hose" that was installed by a friend on his boat.  I have never gotten
>around to doing this on my boat.  However, the purpose of the hump hose is
>to absorb the vibration that otherwise would be transmitted to the aqua lift
>muffler.  I believe that these hump hoses are available from West Marine.
>
>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 James Harkness
>Sent: Thursday, May 04, 2006 12:38 PM
>To: A. R. Gates; C320-List
>Subject: Re: [C320-list] Exhaust Riser Elbow & inward flange - Key West
>
>Had a very similar problem a couple of seasons ago, only in our case the 
>cracks were around the base of the muffler. I understand that the 
>muffler is produced for Catalina under contract and while they were 
>happy to supply a replacement the solution we went for eventually was to 
>take the muffler box to a specialist fabricator locally. This was 
>certainly faster and, as it turned out, much cheaper. Repair involved 
>cutting off the entire base, which revealed the slightly alarming extent 
>of weakness in the original, and rebuilding the box with a new lay-up. 
>The much strengthened muffler has been back in the boat for two seasons 
>now without any further problems
>
>Ours is a '96 hull and at the time of the problem had around 650 hours 
>on the engine (Westerbeke). Am interested in your current experience 
>because I was fairly sure that the leaks developed because of engine 
>vibration at low rpms. That short section of hose from the engine was, 
>or had become, sufficiently rigid to transmit much of the vibrational 
>stresses to the muffler box and I replaced this hose at the same time, 
>with as flexible a substitute as I could find. As I say, so far no 
>further problem!
>
>Jim Harkness
>Simia   # 303
>
>
>
>A. R. Gates wrote:
>
>>On the way to Key West 9 days ago, our flange/pipe leading into the muffler
>from the hose at the rear of the engine developed leaking cracks around most
>of the circumfrance where the flange joins the muffler box.  The bilge pump
>more than handled the leaking water so we made it fine.  I supose the cracks
>are from age/vibration.
>>Before returning, I patched all around the flange with Marine Tex epoxy
>which held well during the return voyage to Naples in 6-7' seas, sustained
>25 kph winds with gusts to 35!  The last nighttime 9 hours of that 21 hour
>leg were in that sort of weather but the boat did well with one reef in the
>main (if I'd known all that was coming I'd have put in 2 reefs before dark).
>>Do those cracks mean it is time to order the replacement muffler from
>Catalina?
>>
>>Although our boat is a 1995 model it only has 320 hours on the engine,
>having spent its first 7 years in light use on fresh-water Lake Winnepausaki
>in NH.     I had the pleasure of meeting Joe Barrett in Naples where we
>ended up in a slip across from his -- he and his fit crew were winners in
>races that started a few hours after we arrived in the weather discribed
>above!   Rollie  #182
>>
>>-----Original Message-----
>>  
>>
>>>From: Dave Anderer <danderer at udel.edu>
>>>Sent: Apr 21, 2006 4:32 PM
>>>To: C320-List <C320-List at catalina320.com>
>>>Subject: Re: [C320-list] Exhaust Riser Elbow
>>>
>>>The surveyor told me my elbow was leaking and needed to be replaced (a 
>>>99 boat with the Yanmar.)  Called Catalina Florida, and they did some 
>>>research and told me it was a standard Yanmar part - call a Yanmar 
>>>distributor.  'Course Florida was just starting to build 320s, so they 
>>>may not have had their facts straight.
>>>
>>>I pulled the elbow and found there was nothing wrong with it, so I never 
>>>pursued getting a new one.
>>>
>>>For what it is worth.
>>>
>>>!!- _______________________________________
>>>!!- C320-List at catalina320.com mailing list
>>>!!- Archives Here: http://www.catalina320.com/list/archives
>>>!!- Change Subscription Here: http://www.catalina320.com/list/change
>>>!!- Subscribe Here: http://www.catalina320.com/list/join
>>>    
>>>
>>
>>
>>!!- _______________________________________
>>!!- C320-List at catalina320.com mailing list
>>!!- Archives Here: http://www.catalina320.com/list/archives
>>!!- Change Subscription Here: http://www.catalina320.com/list/change
>>!!- Subscribe Here: http://www.catalina320.com/list/join
>>
>>
>>  
>>
>
>
>
>!!- _______________________________________
>!!- C320-List at catalina320.com mailing list
>!!- Archives Here: http://www.catalina320.com/list/archives
>!!- Change Subscription Here: http://www.catalina320.com/list/change
>!!- Subscribe Here: http://www.catalina320.com/list/join
>
>
>
>!!- _______________________________________
>!!- C320-List at catalina320.com mailing list
>!!- Archives Here: http://www.catalina320.com/list/archives
>!!- Change Subscription Here: http://www.catalina320.com/list/change
>!!- Subscribe Here: http://www.catalina320.com/list/join