I have had similar experiences a few times now where the problem turned out to
be a partial obstruction to the raw water flow ahead of the strainer, including
on one occasion a tiny piece of twig that got stuck in the elbow in the top of
the strainer housing itself. A quick and dirty fix that has worked for me when
dock side is to disconnect the hose at the strainer and blow it out using a
water hose from the dock. Obviously that did not work when the blockage was in
the strainer housing itself, and it took me quite a while to find that little
bugger. I am not very good at judging the rate of water flow by observing the
splashy output of the exhaust, which can make a partial raw water blockage hard
to diagnose.
My 2 cents.
Steve Thomas
C&C27 MKIII
Port Stanley, ON
----- Original Message -----
From: Robert Boyer via CnC-List
To: Tom Buscaglia ; cnc-list@cnc-list.com
Cc: Robert Boyer
Sent: Tuesday, May 05, 2015 07:49
Subject: Re: Stus-List Overheating as high RPM only
Maybe one or two blades of the pump's impeller are worn off so that the pump
supplies enough cooling water up to a point. I would check the impeller next.
Bob Boyer
S/V Rainy Days / Annapolis MD
1983 C&C Landfall 38 - Hull #230
email: dainyr...@icloud.com
blog: dainyrays.blogspot.com
"There is nothing--absolutely nothing--half so much worth doing as simply
messing about in boats." --Kenneth Grahame
On May 4, 2015, at 9:19 PM, Tom Buscaglia via CnC-List
<cnc-list@cnc-list.com> wrote:
We did a run last weekend to a local harbor for the weekend. Wind was
fluky and it was a short trip so we were motoring. Alera has a Yanmar 3HM35
with around 700 original hours and was running fine at our usual cruising RPM
of 26-2800 on the tach. The hot alarm went off and I let her cool down and
then ran at a lower ROM (1800 or so) and no more alarms. When I got to our
destination, I cleaned out the raw water trap as it was pretty crapped up. On
the way back the alarm went off again but this time all I had to do was
throttle back to around 2200 and it was fine. Much less steam/smoke that on
the way out.
Today I checked the fan belt on the pump and it was a little loose so I
tightened that. I'll be getting her hauled next week for a pressure wash, prop
grease and zinc replacement, and will check the intake then.
Aside from the intake, belt and crap trap, anything else I should check?
Tom B
Tom Buscaglia
SV Alera
1990 C&C 37+/40
Vashon Island WA
(206) 463-9200
www.sv-alera.com
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