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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