Installation manual
COOLING
SYSTEM
CHANGING
THE
RAW
WATER
PUMP
IMPELLER
Close the raw water intake valve. Remove the pump cover
and gasket or
0-ring
with the aid
of
two screwdrivers or
pliers. Carefully pry/pull the impeller out
of
the pump.
Lightly coat the inside
of
the pump housing
w,ith
glycerine.
Install the new impeller, bending the blades in the direction
of
the curve
of
the cam plate. Re-assemble the gasket and
cover.
Open the raw water intake valve.
CAM
PLATE
INSPECTION:
CHECK
THE
BASE
OF
EACH
BLADE
BY
BENDING
VIGOROUSLY.
REPLACE
THE
IMPELLER
IF
THERE
ARE
A
NYC
RACKS.
RAW
WATER
PUMP
NOTE:
Also follow
the
above
procedure
after having
run
hard
a
[!round.
If
.the engine temperature gauge ever shows a higher than
norinal 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.
,
~
RAW
WATER
STRAINER
WASHER~
LIGHTLY
GREASE
THE
PUMP
CHAMBER
WITH
GLYCERINEL
TYPICAL
RAW
WATER
INTAKE
STRAINER
(OWNER
INSTALLED)
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.
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.
16
HEAT
EXCHANGER
The heat exchanger is a copper cylinder which encloses a
number
of
small copper tubes. Raw water is pumped through
the small copper tubes and the fresh water coolant from the
engine is circulated around the copper tubes. The raw water
removes heat from the fresh water coolant.
CLEAN
DEBRIS
aEANCVT
DEBRIS
AT
BOTH
ENDS
ANODE
HEAT
EXCHANGERS
ARE
AL.roAVAILABLE
WITH
CUPRO-NICKEL
TUBING
HEAT
EXCHANGER
GASKET