Thanks all.
Checked obvious hose areas. Nothing. Ran it today on the hard, seemed fine,
Will be launched tomorrow. As we are Bermuda bound in June I need to find
that puppy as it will invariably find its way to the worst spot at the worst
time. My guess its in the after market (Sen-Dur) heat exchanger.
Wish me luck.
David F. Risch
1981 40-2
(401) 419-4650 (cell)
Date: Sun, 17 May 2015 16:11:49 -0500
To: cnc-list@cnc-list.com
Subject: Re: Stus-List Impeller Damn...
From: cnc-list@cnc-list.com
CC: muckl...@gmail.com
You can use the shop-vac to blow out the system too...or a garden hose.
On May 17, 2015 4:51 PM, "Gary Nylander via CnC-List" <cnc-list@cnc-list.com>
wrote:
I agree with the comments which Rick made. I had
intermittent cooling problems on my Yanmar 2QM15 for a number of years - most
of
the time when it had been run for a while, then stopped, then started again.
The
whistle was annoying...
I then had more serious problems, and found the
impeller had come apart. I took all the little pieces of the busted impeller
and
assembled them with glue and tape to make sure there was nothing still in the
engine. OK. With a new impeller it went back to overheating every so often like
it used to do.
I started again - I ran the engine each time I
changed anything... After checking the hoses, strainer, pump, more hoses, and
replacing the zincs, I found not much water coming through the hose leading to
the zinc at the forward part of the engine. Confusing. When I pulled the hose
going to the zinc area and fired the engine, I found a piece of an impeller
which was hard as a rock and coated in rust stuck in there. The impeller I had
just pulled was recent, no rust and not hard. All the other impellers I have
changed in 20+ years of ownership had been whole.
The only thing I can think of is that piece must have been
in there for years - - - and only caused problems in certain conditions. Once
it
was removed, I have had no cooling problems for the last year!
Start at one end, and follow it through. Blow out
everything as you go.
Gary Nylander
30-1 Maryland
----- Original Message -----
From:
Rick Rohwer
via CnC-List
To: cnc-list@cnc-list.com
Cc: Rick Rohwer
Sent: Sunday, May 17, 2015 12:44 PM
Subject: Re: Stus-List Impeller
Damn...
Hi David,
i’ll chime in and hope it helps.
If you are lucky, the vane was torn to tiny particles and pushed all the
way through the cooling system and you are free as rain!
If you are like me, it is lurking somewhere in the system between the
pump and the exhaust outlet and pretty much the same size as when it left.
In a raw water cooled application, that means it could be anywhere in
the cooling system of your engine block, potentially blocking or contributing
to future blockage. In a fresh water cooling system I think the chunks
end up in the heat exchanger or where the raw water is introduced to the
exhaust gases.
Just as a suggestion, try not to run the engine, and starting at the
pump, work your way up line carefully checking for pieces in the hoses hoping
that it lodged in that line prior to entering the block. Hang on to any
chunks you find so you can get an idea of how pulverized it is. After
that point i doubt that there is much chance you would find it. i don’t
know that there is much you can do after that except watch temps and signs of
overheating. Maybe the new fully functioning impeller will push it out
over time.
I like to “lay hands” on my diesel occasionally! I had a hot tub
that would heal itself on occasion after a brief group hug!
Good luck,
Rick
C&C 37+ Paikea
Poulsbo, WA
On May 17, 2015, at 6:01 AM, David via CnC-List <cnc-list@cnc-list.com>
wrote:
A first time. Found a missing impeller vane on my 3QM30.
The whole damn vane. Suggestions before I start tearing the who
damned cooling system apart? Its a raw water cooled engine with
a Sen-Dur retro-fit.
Thanks in advance.
David F.
Risch
C & C 40-2
(401) 419-4650 (cell)
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