Fresh Water Pump Drive
BeH
Tension
Generator models come equipped with belt guards that cover over the belt(s)
on
the front of the
engine.
("Out
of sight-out of
mind."
The
belt guard
is
not
installed
for that
purpose.)
Operators
are
advised
that
the inspection,
service,
and
maintenance
spoken
of below
should
be
followed.
IWARNINGI
Never attempt to adjust the drive belt's tension while the
engine
is
in
operation.
CAUTION
Excessive
water pump drive belt tension
can
cause
rapid
wear
of the belt
and
reduce
the
service life of the
fresh
water pump's
bearings.
Excessive
slack or the presence of
oil
on
the
belt
can
cause
belt slipping, resulting
in
high operating temperatures.
The
water pump drive belt
is
properly adjusted if the belt
can
be
deflected
no
less
than
3/8 inch
and
no
more
than
1/2
inch
(10
mm,
12
mm)
as
the belt
is
depressed
with the thumb at the midpoint
between
the two
pulleys
on
the longest
span
of the
belt.
A
spare
drive belt
should
be
carried
on
board.
Raw
Water Pump
The
raw
water pump
is
a self-priming,
gear-driven,
rotary pump with a non-ferrous housing
and
a neoprene
impeller.
The
impeller
has
flexible
vanes
which wipe against a
curved
cam
plate within the impeller housing,
producing the pumping action.
On
no account should this pump
be
run dry.
There
should
always
be
a
spare
impeller
and
impeller cover gasket aboard
(an
impeller
kit).
Impeller failures occur
when
lubricant
(raw
water)
is
not
present.
Such
failures
are
not warrantable
and
the
operator's
are
cautioned to
make
sure
raw
water flow
is
present at start-up.
Know
your
pump,
know its location
on
the engine
and
know how to
change
the impeller
in
it.
CURVED
CAM
PLATE
RAW WATER PUMP
Remove
the impeller with the
aid
of two
small
screwdrivers,
as
illustrated,
and
carefully pry the impeller
out of the
pump.
Install
the impeller by positioning the
hub
pin
to align with the slot
in
the drive
shaft.
Move
the
blades
to conform to the
curved
cam
plate
and
push
the impeller into the pump's housing.
Westerbeke Engines
68
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