Dave:
I am with Rich on this one......maybe time to replace the mixing elbow
if it is original.....two things not good happen to them over
time....they corridor from the inside out, especially in a salt water
environment, and they 'soot up' and/or carbon up inside.....I have seen
cleaning them but it is never as efficient as replacing them.
Depending on access to your engine, specifically your exhaust manifold,
and your mechanical abilities, the job can be a DIY or maybe you might
need someone who has done it before to do it for you and/or assist you.
I replaced mine last year with mentoring for someone who has replaced
them....glad I had the second set of hands and tips to make the job easier.
Let us know which route you decide to go.....clean or replace....the
tips to remove and reattach the mixing apply, whether cleaning or
replacing, apply both ways.
Rob Abbott
AZURA
C&C 32 - 84
Halifax, N.S.,
On 2014/05/20 9:26 PM, Rich Knowles via CnC-List wrote:
But.... If it's the original elbow, I suggest replacing it. It's not pretty
when the side falls out of it due to corrosion and your boat slowly fills with
exhaust gas and dirty water.
Rich
On May 20, 2014, at 21:12, "Dennis C. via CnC-List" <cnc-list@cnc-list.com>
wrote:
Common issue with Yanmars. Soot builds up in the mix elbow. Pull the mix elbow
and clean it. Should be 4 nuts.
Dennis C.
Touché 35-1 #83
Mandeville, LA
Sent from my iPhone
On May 20, 2014, at 5:17 PM, Dave Lane via CnC-List <cnc-list@cnc-list.com>
wrote:
Well, as things usually go, something that worked in the fall doesn't in the
spring.
The engine starts but no cooling water flows out the exhaust - I did not need
to find this out on launch day!
Anyway, this is a C&C 29-2 with 2GM-F engine. I diagnosed it and it's fine all the way to
and including the raw water out of the heat exchanger. When I blow into the hose going into
the u-shaped exhaust mixer, it's plugged. The engine exhaust itself seems fine. After it goes
through the mixer, there is about a 2" ID hose to the muffler then another 2" hose
to the stern port.
This problem may have been getting worse as the years went by as last year I
was thinking the water flow was not as much as previous years.
Questions:
1. Is it likely that the blockage is in the mixer? Any suggestion for what I
should try next?
2. The mixer has a right angle elbow going into it - should I try to remove it?
Or stick I wire in it to try to unclog it?
3. In order to motor "slowly" home (a few miles) from the marina, I made a run to
Canadian Tire for "stuff" and I plugged the exhaust water input to the mixer and made a
temporary hose from the heat exchanger that I could feed out of the cockpit locker and over the
side (the water flow was great). Can engine be run without water flowing through the muffler? (ie.
does it depend on water cooling?)
Thanks in advance,
Dave
St. Margaret's Bay, NS
"Vela" C&C 29-2
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