Specifications
COOLING
SYSTEM
RAW
WATER
INTAKE
STRAINER
NOTE:
Always
install
the strainer at or
below
the
waterline
so
the
strainer
will
always
be
self-priming.
A clean raw water intake strainer
is
a vital component
of
the
engine's cooling system. Include a visual inspection
of
this
strainer when making your periodic engine check. The water
in
the
glass should be
clear.
Perform the following maintenance after every
100
hours of
operation:
1.
Close the raw water seacock.
2.
Remove and clean the strainer
filter.
3. Clean the glass.
4.
Replace the sealing washer
if
necessary.
5.
Reassemble and install the strainer.
6.
Open the seacock.
7. Run the engine and check for leaks.
NOTE:
Also follow
the
above procedure after
having
run
hard
aground.
If the engine temperature gauge ever shows a higher than
normal
reading, the cause may be that silt, leaves or grass
may have been caught
up
in
the strainer, slowing the
flow
of
raw water through the cooling system.
STRAINER
RAW
WATER
INTAKE
STRAINER
OWNER
INSTALLED
(TYPICAL)
RAW
WATER
PUMP
The raw water pump
is
a self-priming, rotary pump with a
non-ferrous housing and a Neoprene impeller. The impeller
has
flexible blades 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). Raw water pump impeller failures occur
when lubricant (raw water)
is
not present during engine
operation. Such failures
are
not warrantable, and operators
are
cautioned to make sure raw water
flow
is
present
at
start-up. The raw water pump should
be
inspected
periodically for broken or tom impeller blades. See
MAINTENANCE
SCHEDULE.
Changing
the
Raw
Water
Pump
Impeller
Close the
raw
water intake valve. Remove the pump cover
and,
with
the
aid of two small screwdrivers, carefully
pry
the
impeller out of the
pump.
Install
the
new
impeller and gasket.
Move the blades
to
conform
to
the curved cam plate
and
push the impeller into the pumps housing. When assembling,
apply a
thin
coating
of
lubricant
to
the impeller and gasket.
Open the raw water intake valve.
A
CAUTION:
If
any
of
the
vanes
have
broken
off
the
impeller,
they
must
be
found
to
prevent
blockage
in
the
cooling
circuit.
They
often
can
be
found
in
the
heat
exchanger.
Engines & Generators
14