Changing The Raw Water Impeller; Heat Exchanger - Westerbeke 8.0KW - 60Hz EDT Operator's Manual

COOLING SYSTEM
CHANGING THE RAW WATER PUMP IMPELLER
. Close the raw water intake valve. Remove the pump cover
and gasket or O-riug with the aid of two screwdrivers or
pliers. Carefully pry/pull the impeller out of the pump.
Lightly coat the iuside of the pump housing with glycerine.
Install the new impeller and cover with gasket, Open the raw
water intake valve.
INSPECTION: CHECK THE BASE OF
EACH BLAOE BY BENDING VIGOROUSLY.
REPLACE THE IMPELLER IF
I
Htlit Alit
ANY CRACKS.
BLADES WITH
GLYCERINE
RAW WATER PUMP
A
CAUTION:
If any of the vanes have broken off the
impeller, they must be found to prevent blockage in the
cool/ng circuit. They often can be found hl 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.
Perfonn 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 rLln hard
aground.·
If the engine temperature gauge ever shows a higher than
nonnal 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
TYPICAL RAW WATER INTAKE STRAINER
(OWNER INSTALLED)
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 atound the copper tubes. The raw water
removes heat from the fresh water coolant.
HEAT EXCHANGER
PETCOCK·
CLEAN
DEBRIS
CLEANOUT
DEBRIBAT
BOTHENOB
ANODE
HEAT EXCHANGERS ARE
N..&PAVAILABLE WITH
CUPRO·NlCKEL TUBING
HEAT EXCHANGER
Enl!ines & Generators
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