SERVICE BULLETIN
V.27
DATE:
December
5,
1984
BULLETIN
NUMBER:
139
MODEL:
All
Propulsion
and
Generator
Models
SUBJECT:
Hydro-Hush
Muffl
er
Install
ations
PIN:
The
illustrations
shown
with
this
text
should
be
used
as a guide
when
making
an
installation
of a
Hydro-Hush
Muffler.
When
used
in conjunction with propulsion engine, the
Hydro-Hush
Muffler should
be
mounted
close to the
fore-aft
center
line
of the boat.
When
used
with
a
generator
unit,
the muffler should
be
as
close
as
possible to the generator.
All
installations
should
be
such
that
the entry of water into the engine exhaust
manifold
and
cylinders
is
prevented while under
sail
and
at
various angles of
heel,
from
following seas,
when
backing
down,
or
any
other condition.
Units
installed
with the exhaust manifold/water injected exhaust
elbow
at
or
below
the water
line
of the vessel
must
install
a vent or
syphon
break in the
sea water supply
line
to the water injected exhaust
elbow.
The
seawater supply
line
must
be
looped
above
the water
line
a
minimum
of six (6) inches with the
vent or
syphon
break
installed
at
the top of
this
loop.
The
vented loop,
when
used,
can
be
a
mechanical
syphon
break
as
shown
in the
illustration
or a simple tee arrangement
with
a
small
hose
or tube (3/16-1/4
inch
1.0.)
routed to the transom exhaust discharge or to a separate thru-hull
fitting
located
above
the water
line.
This
hose
or tube
must
be
routed in
such
a
way
that
it
will drain of water
when
the engine
is
shut
down
and
allow
air
into the sea water supply
hose
and
injection
elbow.
The
syphon
break or vent
is
installed
to break the
vacuum
in the
sea
water
cooling
circuit
and
thereby discourage
syphoning
of sea water through
this
circuit,
and
subsequently
filling
of the exhaust
and
engine cylinders
with
sea water.
When
used,
syphon
breaks should
be
checked
periodically for proper
operation
and
should
be
installed
in a location where, should they leak sea
water,
it
would
not leak onto the engine or
its
accessories.
The
syphon
break or vent
must
be
located
above
the
vessel's
water
line
high
enough
so
as to
remain
above
the water
line
at..2llangles
of vessel
heel
and
pitch.
The
Hydro-Hush
Muffler
remains
approximately
30%
full
of water
after
engine
shut-down
when
there
is
a
maximum
of
48
inches of
lift
on
the discharge side.
The
installation
information given in
this
text
is
to
be
used
as a guide only.
Westerbeke
cannot
be
responsible in
any
way
for muffler
installations.
Wester-
beke
presumes
the
installer
to
have
a basic
knowledge
of
marine
installation
requirements.
33934
J. H.
WESTERBEKE
CORP.
AVON
INDUSTRIAL
PARK,
AVON,
MASS.
02322·
(6f7J
588-7700
CABLE:
WESTCORP,
AVON·
TELEX:
92-4444
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