Heat Exchanger - Westerbeke 44A FOUR-35 C THREE Operator's Manual

COOLING SYSTEM
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 assem-
bling, apply a thin coating of lubricant to the impeller and
gasket. Open the raw water intake valve.
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.
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1:
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.
STRAINER
FILTER
I
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~--~
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 around the copper tubes. The raw water
removes heat from the fresh water coolant.
HEAT EXCHANGER
PETCOCK
CLEAN
DEBRIS
ZINC
ANODE
HEAT EXCHANGER
GASKET
Engines & Generators
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