Alan,
A few seasons back, after motoring back home, I noticed antifreeze
underneath the my engine (Yanmar 2GMF). What I eventually discovered
was that one of the 'bled or drain screws' had loosened just enough to
cause a small leak. On my engine, there are, I think, 3 outlets which
have 'T shaped' taps which you open to drain the antifreeze, 2 for the
engine and 1 for the heat ex changer, all on the starboard side of the
engine. There are small clear hoses, maybe 1/4", attached to each
making it easy to drain into a container when each is opened.
Don't know if you have the same but worth a look.....all I did was
tighten them (the 1 from the heat exchanger) was the one loose, problem
solved.
Rob Abbott
AZURA
C&C 32 - #277
Halifax, N.S.
On 2019-04-05 12:45 p.m., ALAN BERGEN via CnC-List wrote:
Over a period of time, I'm losing antifreeze from the engine. I
haven't seen any leaks coming from any of the hoses or hose
connections while the engine is running. Can anyone confirm that the
likely cause is a leak in the heat exchanger? The engine is a Yanmar
3GMf, 20hp model. How difficult is it to replace/repair the heat
exchanger core?
Alan Bergen
35 Mk III Thirsty
Rose City YC
Portland, OR
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