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the water line and an anti-siphon break installed at the top of its
loop.
This loop should be high enough above the water line so as not
to be below it at various angles of heel when under sail.
Lines feeding raw cooling water to stuffing boxes, if installed,
must be installed so as to prevent siphoning of water back into the
engine exhaust and engine cylinders as above.
Most exhaust systems today use a water lift type muffler such as
the Westerbeke "Hydro-Hush".
In most installations there is a dry,
insulated high loop after the engine manifold and before the muffler
to prevent water flowing backwards into the engine during cranking.
It
is
essential
not
to hang
too much weight
in
the
form of
exhaust
system
components
rigidly
from
the
engine
manifold.
Generally, it is permissible to directiy connect a pipe nipple and a
water
jacketed
exhaust
elbow,
which two components weigh about
8 pounds (4 kg).
If there are
more
components
to
be
rigidly
connected
to
each
other
than
will
weigh
8
pounds,
then
a
flexible exhaust section must be
I
installed
between
the
manifold
~~~~
outlet and these exhaust system
-~
components.
~~
ENCINE INSTALLATIONS WITH EXHAUST MANI-
FOLD/WATER INJECTED ELBOW MINIMUM OF 6
INCHES ABOVE VESSEL WATER LINE.
ENCINE INSTALLATIONS WITH EXHAUST MANI-
FOLD/WATER INJECTED ELBOW AT OR BELOW
VESSEL WATER LINE
48"
max.
I
I
I
~~-J
.~/
12"min.
The exhaust system must be supported or suspended independently of
the engine manifold, usually using simple metal hangers secured to the
overhead.
All dry portions of the exhaust system can be constructed of com-
mon
black
iron pipe
and
should
be wrapped
in sui table
insulation
material to keep surface temperatures as low as possible.
Many installations use flexible rubber exhaust hose for the water
7
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