Operator`s manual
Oil Drain Hose
An
oil
sump drain hose
is
installed
on
the
engine
with the discharge
end
secured
by
a bracket at
the
front
of
the
engine.
Oil
may
be
drained from this
hose
by removing
the
cap
and
the discharge
end
of
the
hose
from
the
support bracket
and
lowering the
hose
into a container.
The
hose
cap
fitting
is
1/4 inch
NPT
(National
Pipe
Tap)
and
can
be
extended, or
have
a pump added for easier
removal
of
the
old
oil,
if
desired.
Connecting Pressure Sensing Devices
to
Oil
Galleries
Oil
pressure sensing devices,
such
as
senders
and
switches, must not
be
connected to
an
engine's
oil
gal-
lery with the
use
of extended nipples or
tees.
The
reason
is
simply that continued engine vibration
causes
fatigue
of
the fittings
used
to
make
such a connection.
If
these
fittings
fail,
the
engine
loses
its
oil
pressure
and
quickly
seizes.
When
additional sensing devices such
as
switches or sensors
need
to
be
installed that function
on
engine
oil
pressure, these devices
must
be
bulkhead-mounted
and
connected to the
oil
gallery using
an
appropriate
grade
of
lubricating
oil
hose.
Any fittings
used
to connect
the
hose to the gallery must
be
of
steel
or
malle-
able iron composition.
Brass
must not
be
used
for this application.
Cooling System
The
engine
is
fresh
water cooled
by
an
engine-mounted
heat
exchanger.
Sea
water
is
used
as
the heat
exchanger's
cooling medium.
Sea
water
is
pumped into the exchanger
by
a
sea
water
pump,
where
it
cools
the
fresh
water that circulates through
the
engine block,
and
is
then injected into
the
exhaust discharge, car-
rying with it
the
heat removed from the engine's
fresh
water cooling
system.
Sea
water should
be
supplied to the
sea
water pump through a flush-type through-hull fitting using a wire-
reinforced hose between the through-hull fitting
and
the
sea
water pump.
The
sea
water should
be
directed
through a visual-type
sea
water strainer, which will trap debris before
~
reaches
the
sea
water pump
and
the
heat exchanger,
and
then
be
delivered to
the
pump. Hoses routed from
the
through-hull fitting to
the
strainer
and
to
the
sea
water pump should
be
wire-reinforced to
prevent
the
hose
from collapsing while the engine.
is
running (suction from
the
pump may collapse a non-reinforced
hose).
The
sea
water strainer should
be
mounted
at
or below the water line to
make
sure
the
sea
water line
remains
primed.
CAUTION
DO
NOT
use
a scoop-type through-hull fitting
as
a
means
of supplying
sea
water to the
en-
gine.
Water pressure against this type of fitting, while
the
vessel
is
under
sail,
can
push
sea
water past the
sea
water pump's impeller into the engine's exhaust
system,
filling
it
and
the
engine
as
well.
Flush-type,
clear,
through-hull fittings
are
recommended
and
should
be
lo-
cated
on
the
hull
so
as
to
be
below
the
waterline during
all
angles
of
boat operation.
The
use
of common-type street elbows
is
not recommended for plumbing the
sea
water cir-
cuit.
These
generally
have
very restrictive inside diameters. Machine fittings
are
preferred.
Westerbeke Diesel Engines
30