Hi David,
Probably a pitted shaft at the seal area. Replace shaft & seal no big
deal, assess bearing(s) at the same time.
Cheers, Russ
Sweet 35 mk-1
At 06:04 PM 18/05/2015, you wrote:
Rick,
Thank you. Correct on all counts except the missing vane is from
the impeller which internally circulates the glycol.
I need to do a bit of digging around the Sen-Dur exchanger and its
design. Flat out at work all week and will be back out it this weekend.
FYI...The raw water pump needs to be replaced too. Leaking
shaft. $400 for a pump. Whodathunk?
Damn.
David F. Risch
(401) 419-4650 (cell)
----------
To: [email protected]
Date: Mon, 18 May 2015 18:44:59 -0400
Subject: Re: Stus-List Impeller Damn...
From: [email protected]
CC: [email protected]
David,
If I'm not mistaken, having the Sen-Dur retrofit makes it a fresh
water cooled engine, not raw water.
Two water pumps, right? The pump on the front of the engine
circulates water/glycol through the engine block and to the heat
exchanger, the second pumps sea water to the heat exchanger and then
to the exhaust mixing elbow?
If that is the case, and the impeller blade is from the sea water
pump, there is about a 90% chance the blade is in the heat exchanger.
Rick Brass
Washington, NC
From: CnC-List [mailto:[email protected]] On Behalf Of
David via CnC-List
Sent: Sunday, May 17, 2015 6:01 PM
To: CNC CNC
Cc: David
Subject: Re: Stus-List Impeller Damn...
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: <mailto:[email protected]>[email protected]
Subject: Re: Stus-List Impeller Damn...
From: <mailto:[email protected]>[email protected]
CC: <mailto:[email protected]>[email protected]
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"
<<mailto:[email protected]>[email protected]> 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: <mailto:[email protected]>Rick Rohwer via CnC-List
To: <mailto:[email protected]>[email protected]
Cc: <mailto:[email protected]>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
<<mailto:[email protected]>[email protected]> 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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