Installation manual
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 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
Donna1
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
WASHER
->i(;",L;~
STRAINER
I
RAW
WATER
INTAKE
STRAINER
OWNER/BUILDER
INSTALLED
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 carn 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
torn impeller blades. See MAINTENANCE
SCHEDULE.
NOTE:
Should a failure occur with the pump s internal parts
(seals
and
bearings), it may be more cost efficient to pur-
chase a new pump and rebuild the original pump as a spare.
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
pump's
housing. When
assein~
bling, apply a thin coating
of
lubricant to the impeller and
gasket.
Open the raw water intake valve .
.
RAW
WATER
IN
--_*"
t
TO
HEAT
EXCHANGER
ALIGN
WITH
THE
SLOT
IN
THE
SHAFT
A
CAUTION:
If
any
of
the
vanes
have
broken
off
the
impeller,
they
must
be
.located
to
prevent
blockage
in
the
COOling
circuit.
They
often
can
be
found
in
the
heat
exchanger.
Engines
&
Generators
17