Unless your boat has a dry exhaust - not likely - you have a way to mix exhaust and water somewhere. At least back in the Atomic 4 days Universal did not make mixing elbows, so the installer was left to buy or fabricate one. Mine is made of black iron pipe from Home Depot and I try and remember to replace it every 5 years or so. Follow the coolant hoses and you will find one going into the exhaust somehow. Whatever that hose connects to is the mixing device. Having a diesel you will not have a jacketed exhaust like some 1960s era C&Cs did. Those only work on gasoline engines because diesel exhaust corrodes through the copper pipe those were made of.
Joe Della Barba j...@dellabarba.com <mailto:j...@dellabarba.com> COQUINA C&C 35 MK I From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David Knecht via CnC-List Sent: Saturday, November 15, 2014 9:27 AM To: Robert Abbott; CnC CnC discussion list Subject: Re: Stus-List Exhaust mixing elbow This discussion made me think about the situation on my boat with a Universal M4-30. I looked at the engine diagram and parts list online and found no mention of a mixing elbow. Is this a Yanmar specific issue? If so, how does the Universal handle exhaust? Dave On Nov 15, 2014, at 9:11 AM, Robert Abbott via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: On 2014/11/13 8:23 AM, John and Maryann Read via CnC-List wrote: John Your mixing elbow is original ie 32 years old......I am assuming it has spent its life in a 'salt water environment'. If so, there has to be some corrosion taking place on the inside. A mixing elbow is not an expensive item and if you have taken yours off and put it back on, then do yourself a favor and replace it before it fails at the most inopportune time. In 2012, a fellow club member with a 1984 C&C 32 had his mixing elbow 'split' at the top of elbow spewing salt water and gases into his engine compartment while motoring up the coast. He made it back to the club O.K. but he then lost several weeks in the sailing season getting someone to replace it for him. I took his old mixing elbow and cut it open to examine it......while the outside wall looked fine, the inside was in pretty rough shape. And the problem wasn't carbon buildup but salt water corrosion. The following season, I replaced mine......I deem it preventable maintenance and what will eventually fail. Rob Abbott AZURA C&C 32 - 84 Halifax, N.S. Our 34 has the original Yanmar 3GM which is working like a charm. How does one tell if the mixing elbow is due for replacement??. Ours still has the original mixing elbow which we removed and inspected about 12 years ago. It was fine. Lots of water comes out the exhaust and engine performance is fine. Engine is used mostly for motoring in and out of the mooring field with periodic runs of an hour or so to get to the starting line. I was thinking of removing the hose and use a mirror and spot light to look inside?? John and Maryann Legacy III 1982 C&C 34 Noank, CT --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com <mailto:CnC-List@cnc-list.com> To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com <mailto:CnC-List@cnc-list.com> To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com Aries 1990 C&C 34+ New London, CT
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