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SEAWATER INLET SYSTEM (HEAT EXCHANGER COOLED ENGINES)
Your engine is fitted with a gear
driven sea water pump which sucks
in seawater or raw water to cool the
closed circuit system via the heat
exchanger.
1. It is very important that the
seawater inlet should have a
strainer system either built into
the sea cock or a high level
system with visual inspection
glass, as shown, mounted just
above the water line.
2. The inlet sea cock and pipe work
to the sea water pump should be
22mm ID or 3/4" minimum.
3. Good access to the inlet seacock
is essential so that plastic bags or
sea weed trapped in the intake
can be poked out!
4. All pipe work should have
approved marine grade stainless
steel hose clips. Any loose
clamps or bad connections can
cause flooding and sinking of the
vessel.
5. If water is required for stern tube
lubrication then this should be
taken from a 'T' piece in the pipe
going from the heat exchanger
outlet to the water injection bend.
6. Scoop type water pickups should
never be used, as water will be
forced through the pump and
into the exhaust system whilst
Water Level
the vessel is in motion. This is
very dangerous as the exhaust
will eventually fill and raw water
will back up into the engine
through the exhaust valve.
Catastrophic failure will result as
soon as the engine is restarted.
Note: The maximum lift of the sea
water pump is 2m
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