Raw Water Intake Strainer; Raw Water Pump - Westerbeke 12C- TWO Operator's Manual

COOLING SYSTEM
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 fat1ures are not warrantable, and operators
are cautioned
to
tnllke sure raw water flow is present at
start-up. The raw water pump should be inspected
peiipdjcally for broken or
tom
impeller blades. See
MAtNI'ENANCP; S9HEDULE. .
NOTE:
Shoultr afailure occur with the pumps internal parts'
(seals and bearings), it may be more cost efficient to
p~rc1ulse
a new pump and rebuild the original pump as
. a spare.
ImpellerKit #048500
FITTING SCREW
SLIDES INTO
SHAFT SLOT
• IMPELLER
INSPECTION: CHECK AT THE
.' 0 "
ni,'"
, EACH BLADE BY BENOiNG VIGOROUSLY.
. REPLACE THE IMPELLER IF THERE
ARE ANY CRACKS •.
WHEN INSTALLING: TAKE CARE TO AUGN
THE IMPELLER KEYWAY WITH THE SHAFT
KEY. FOLD THE IMPELLER BLAOESIN
EITHER DIRECTION (THEY WILL TURN IN
THE CORRECT POSITION WHEN THE
IMPELLER STARTS TO ROTATE).
RAW WATER
PUMP'
#048080·
CHANGING THE RAW WATER PUMP IMPELLER
Close the raw water intake valve. Remove the pump cover
and gasket or O-ring with the aid of tWo screwdrivers or pli-
ers. Carefully pry/pull the impeller out of the pump. Lightly
coat the inside of the pump housing with glycerine, InstaU
the new impeller aod cover with gasket, open the raw water
intake valve.
NOTE:
Never allow the pump to rnn dry. Even a short period ,
of dry rnnning may destroy the impeller.
.. ·RAW-wATERJ'llMP(wu,Y"MODELsj
SAME INSTRUCTIONS APPLY . .
,~:--,
Impeller Kit
#034440
THE IMPELLER
SCREW WITH THE
, SLOT IN THe SHAFT
NOTE:
[{any of the
vanes
have broken off the impeller tliey
must be found to prevent blockage in the cooling circuit
They often can be founil iii; the heat exchanger.
RAW WATER INTAKE STRAINER
A cleao raw water intrus:e:strainer is a vital component of the
engine's cooling sysfum. Include a visual inspection of this ,
strainer when nuiking your pedodic engine check. The water
in the glass should be clear.
Perform the following maintenance after every
100
h6.urs' of
operation:
1. Close the raW water Beacoelt ..
2. Remove aod clean the strainer filtet
3. Clean tile glass .
4. Replace the washer if necessary.
5. Reassemble aod install the strainer.
6. Open the seacock .
7. ,Roo the engine and check for leaks,
NOTE:
Also follow the above procedure after having rnll hard
ag1'rJund.
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
ill
the strainer, slOWing the flow of
raw water through the. cooling system.
NOTE:
Always install the strainer at or belo~ the waterline so
the strainer will always be self-printing.
TYPICAL RAW WATER INTAKE STRAINER
(OWNER INSTALLED) .
INCOMING
FI~TER
SEACOCK;,..· """''''''''''
~WESTERBEKE
INSPECT AND
GLEAN EVERY
100HOURS
Engl!J~-4~en!Jrators
18
..
:.;.