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COOLING SYSTEM
RAW WATER INTAKE STRAINER
IIOTE:
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 1 ()() hours of
operation:
1. Close the raw water seacock.
2. Remove and clean the strainer filter.
3. Clean the glass.
4.
Replace the sealing washer if necessary.
S. 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
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.
SEALING
WI;SHER~~~~~
RAW WATER INTAKE STRAINER
OWNER INSTAllED /TYPICAL)
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 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 tom impeller blades. See
MAINTENANCE SCHEDULE.
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 pumps housing. When assembling,
apply a thin coating of lubricant to the impeller and gasket.
Open the raw water intake valve.
A
CAUTION:
If any of the vanes have broken off the
ImpelleT, they must be found to prevent blockage In the
cooling circuit. They often can be found In the heat
exchanger.
Engines & Generators
14
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