We are on our first extended cruise of the year
for a club event in Olympia WA and are hiving a
problem with overheating with our 3HM35 Yanmar. Here's the deal...
We usually run as about 26-2800 RPM. Depending
on the condition of the bottom and the prop, that
gives us between 6.5-7.3 KTS. We have had some
intermittent issues with overheating, but it was
usually me pushing too hard in heavy seas or
running above the usual RPM range. Backing off
always relieved the problem. And we have no
gauge, so this is all based on the alarm which may or may not be accurate.
As we were heading out this time the Admiral was
at the helm and I was below messing with
something and the alarm went off as we were
running at about 2200 RPM. We were able to run
at under 2000, but above that the alarm sounded
and we had to back down. We continued on at 4.5 KTS.
I checked the strainer and through hull. All
good there. Water seems to be exiting the
exhaust as usual. I am planning on a haul out and
bottom job next month, and did not have a diver
clean the bottom and prop (should have done that
for sure). My assumption was that the barnacles
on the prop and dirty bottom, along with the
15-20 KT head wind were taxing the engine and
causing the overheating. But the "experts" in my club feel otherwise.
I tried to get at the gooseneck to see if that
might be the problem. I was able to get the
water hose off and poke around in there with a
wire, but decided that pulling the exhaust hose
was not something to try 30 miles from home as if
I screwed it up and damages the exhaust hose I
could be stuck here for a while.
I have heard all of the problem YANMAR's have
with exhaust back up and am wondering if that may
actually be the problem. I have asked to have it
checked every tine I get the engine serviced, but
there's no telling what that entailed or even if
it was done....so, when she goes into the yard
for the pain job I think replacing the gooseneck
with the stainless aftermarket one may be in order.
Here are my questions:
1. Can the dirty bottom and barnacle
encrusted prop- result in an overheating problem?
2. Would a carboned up gooseneck cause a
problem like the one I am experiencing?
3. Where can I get one of those nifty aftermarket stainless goosenecks?
Any additional suggestions are welcome and appreciated!
thx
Tom B
.¤º°`°º¤,¸¸,¤º°`°º¤¤º°`°º¤,¸¸,¤º°`°º¤.
Tom & Lynn Buscaglia
SV Alera
C&C 37+/40
Vashon Island WA
(206) 463-9200
www.sv-alera.com
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