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engine block or heat exchanger, and relinquished with the
exhaust gases through the exhaust system. The water pump
uses a small impeller made of synthetic rubber. The impeller
and water pump cannot run dry for more than a few seconds.
Inboard engines use a thru-hull water intake scoop and strainer
for each engine. The scoop is located on the hull bottom and
must be kept free of mud, weeds and other debris. The strainer
is mounted in the engine compartment bilge. A ball valve is
provided on each intake thru-hull. Be sure these valves are in
the open position before operating the boat engines.
The in-line sea strainers are mounted in the bilge, in front of
each engine. The strainers should be visually inspected fre-
quently, by looking through the glass case, for accumulation
of marine growth, weeds, and other foreign objects. If clogged
or dirty, the strainer should be cleaned.
A CLOGGED SEA STRAINER CAN RESTRICT THE
SUPPLY OF COOLING WATER TO THE ENGINE AND
EXHAUST COMPONENTS, WHICH COULD RESULT
IN SEVERE ENGINE AND EXHAUST SYSTEM
DAMAGE.
Cleaning the sea strainers
•
Turn off the engines.
•
Close the engine water intake valve.
•
Remove the plastic thumb nuts to open the top of the
strainer and remove the screen.
•
Thoroughly flush the screen and the inside of the strainer
to remove foreign matter.
•
Lubricate the seal.
•
Reassemble the strainer making sure that all fasteners
are tight.
•
Open the intake valve.
•
Start the engine and inspect the strainer for leaks.
Inboard boats utilize an exhaust hose to expel/discharge cool-
ing water. A periodic inspection of the hose, mufflers and
related parts should be made to ensure that leaks or heat dete-
rioration have not resulted.
A “freshwater” or “closed” cooling system that is cooled by
a heat exchanger and the seawater cooling system provides
adequate engine cooling without exposing the internal en-
gine cooling system to the harmful effects of surface water.
This system is standard with all diesel engines. The engine
owner’s manual provides additional information regarding the
service and maintenance of this equipment.
SHOULD AN ENGINE INTAKE, EXHAUST OR
COOLING HOSE RUPTURE, TURN OFF THE ENGINE
AND CLOSE THE ENGINE WATER INTAKE VALVE
IMMEDIATELY. PROCEED, UNDER TOW IF
NECESSARY, TO A SERVICE FACILITY FOR
APPROPRIATE REPAIRS. MAINTAIN A CLOSE
VISUAL WATCH ON THE PROBLEM HOSE AND THE
BILGE WATER LEVEL.
1.5
Emergency Pump Out System
(Optional)
There is an optional emergency pump out system located in
the intake line for the starboard engine that enables the op-
erator to use the starboard engine seawater pump to remove
water from the bilge in an emergency. A Tee fitting in the
intake line between the sea strainer and the starboard engine
is connected to a tube that extends close to the bottom of the
bilge. There is a ball valve on the tube that can be opened to
allow the engine pump to consume accumulated water in the
bilge. This valve should always be completely closed during
normal operation.
If the boat should develope a leak serious enough to over-
come the bilge pump system, the emergency pump out sys-
tem can be engaged to assist the bilge pumps. Since diesel
engines use a large quantity of seawater to cool the heat ex-
changer and exhaust system, the engine seawater pump can
remove much more water than the bilge pumps and could
save the vessel from sinking.
Port Engine and Accessory Sea Strainers and Ball Valves
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