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.
Water Level
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.
cause flooding and sinking of the vessel.
3. Good access to the inlet seacock is essential so that plastic bags or sea weed trapped in the intake can be poked out!
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.
4. All pipe work should have approved marine grade stainless steel hose clips. Any loose clamps or bad connections can
6. Scoop type water pickups should never be used, as water will be forced through the pump and into the exhaust system whilst
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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
