Dave,

I put a Universal M30-B in my club launch two years ago, and it had a mixing "elbow" supplied loose, I had to add a 2" long pipe between the manifold and the elbow. If you go to page 13 of the manual in the link below, you'll see it. Not sure if the M4-30 has the same, as the manual on the westerbeke site for that engine doesn't show one, but the engine I took out of our launch was a 1990's vintage Universal and it had the same thing.

Neil Gallagher
Weatherly, 35-1
Glen Cove, NY

http://www.westerbeke.com/OnlineManuals/201009_m3_20b_parts.pdf


On 11/15/2014 12:49 PM, Joe Della Barba via CnC-List wrote:

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


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Aries

1990 C&C 34+

New London, CT




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