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SEA WATER INLET FOR HEAT EXCHANGER COOLED ENGINES
Your engine is fitted with a gear driven sea water pump
which sucks in seawater (raw water) to cool the closed
circuit system via the heat exchanger.
1. We recommend a standard inlet sea cock that should
be 1"/25 mm minimum; to suit 1"/25mm ID hose.
Please ensure a good quality hose (possibly reinforced)
that does not collapse when under suction from the
seawater pump.
2. It is very important that the seawater inlet should have
a strainer system either 'A' built into the sea cock, or
'B' a high level system with visual inspection glass (as
shown) mounted just above the water line.
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Sea Water Inlet / Filter
'B'
Sea Water Level
'A'
5. We do not recommend the use of 'Scoop' type water
pickups, because if fitted the wrong way around the
water will be forced through the pump and into the
exhaust system whilst the vessel is sailing.
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Sea Water Inlet - Scoop
3. Good access to the inlet sea cock from inside your
boat is essential so that plastic bags or seaweed
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. It is accepted practice that two stainless steel
clips should be used on all raw water pipes for
security. Ensure that you use the correct grade of hose.
Note: The maximum lift of the sea water pump is 2m
when primed.
This is very dangerous as the exhaust will eventually
fill and sea / raw water will back up into the engine
through the exhaust valve. Catastrophic failure will
result as soon as the engine is restarted.
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