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COOLING SYSTEM
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.
NOTE:
Also follow the above procedure after having run hard
aground.
If the engine temperature gauge ever shows a higher than
Donna1 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
WASHER ->i(;",L;~
STRAINER
I
RAW WATER INTAKE STRAINER
OWNER/BUILDER INSTALLED
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 carn 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 torn impeller blades. See MAINTENANCE
SCHEDULE.
NOTE:
Should a failure occur with the pump
s
internal parts
(seals and bearings), it may be more cost efficient to pur-
chase a new pump and rebuild the original pump as a spare.
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
assein~
bling, apply a thin coating of lubricant to the impeller and
gasket. Open the raw water intake valve .
. RAW WATER IN
--_*"
t
TO HEAT
EXCHANGER
ALIGN WITH THE
SLOT IN THE SHAFT
A
CAUTION:
If any
of
the vanes have broken off the
impeller, they must be .located
to
prevent blockage in
the COOling circuit. They often can be found in the heat
exchanger.
Engines & Generators
17
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