Operator`s manual
Operation
A
pressure
drop
warning
light
is
mounted
on
the
instrument
panel
on
V-drives
equipped
with
an
oil
cir-
culating
pump.
The
warning
light
will
stay
on
until
the
boat
gets
under
way
and
the
engine
speed
increases
to
suf-
ficient
RPM
for
the
pump
to
maintain
pressure.
This
normally
occurs
at
approximately
1200
RPM,
but
the
actual
speed
may
vary
by
as
much
as
400
RPM.
Extended
cruising
at
low
RPM,
such
as
when
trolling,
is
not
harmful
to
the
V-drive,
even
though
the
warning
light
may
stay
lit.
Normal
operation
is
between
6
to
12
PSI.
The
light
will
go
on
when
the
oil
pressure
drops
below
2
PSI.
Loss
of
oil
and/or
insufficient
oil
level
are
the
major
causes
of
pressure
drop.
The
oil
level
should
immediately
be
restored,
and
while
running
the
boat,
the
unit
should
be
checked
for
leaks.
If
the
oil
level
is
normal
and
the
light
stays
lit
when
the
boat
reaches
normal
cruising
speed,
the
wir
ing
should
be
checked
for
loose
and/or
corroded
connections.
If
the
wiring
is
correct
and
the
light
remains
lit,
the
#49
pressure
drop
switch,
which
is
mounted
on
the
side
of
the
V-dr
i
ve
(see
illustration),
should
be
checked
for
proper
oper
ation.
The
switch
can
easily
be
removed
and
an
accurate
oil
pressure
gauge
installed
in
its
place.
If
the
pressure
is
normal,
the
switch
should
be
replaced.
If
the
pressure
is
below
normal,
the
oil
lines
should
be
checked
for
blockage.
The
pump
should
be
inspected
and
replaced
if
necessary.
The
pump
is
standard
on
the
RV-48
and
an
optional
feature
on
other
models
(not
available
on
the
RV-IO).
The
oil
level
should
be
checked
several
times
during
the
season,
especially
on
V-drives
whitout
pumps
(see
OIL
FILL).
A
clatter
or
rattle
in
the
V-drive
at
low
RPM
is
due
to
the
over-
riding
of
the
propeller
during
the
compression
stroke
of
the
engine.
Although
annoying,
it
is
not
harmful.
It
may
be
reduced
by
adjusting
the
idle
speed
and/or
tuning
up
the
engine
for
smoother
operation.
Maintenance
1.
OIL
CHANGE
AND
JOINT
LUBE
After
the
first
100
hours
of
operation
and
every
season
and/or
500
hours
thereafter,
the
oil
should
be
changed.
Run
the
boat
to
warm
up
the
V-drive
to
operating
temperature.
Turn
off
the
engine.
Remove
the
plug
in
the
#6B
bottom
cover
that
is
opposite
the
#438
oil
strainer.
Reinstall
after
draining.
Disconnect
the
oil
hose
leading
from
the
#438
strainer
(leave
the
elbow
on
the
strainer).
Unscrew
the
strainer
and
clean
the
outside
surface.
Reinstall
the
strainer
and
reconnect
the
oil
hose.
Unscrew
the
two
#22
magnetic
plugs
that
are
located
on
diagonally
opposite
corners
of
the
#lC
main
housing.
77
Westerbeke Diesel Engines