FNM® Series HPE – Installation Manual – 23
Sea water
minimum flow rate
Minimum diameter of
sea water pipes
The location of the flange or the sea water intake connector is
available in the following table:
Position of the sea water
intake flange position
At the diesel fuel or diesel
fuel/steering oil
3.0HPE with exception of the Volvo®
stern drive prearrangement
3.0HPE Volvo® stern drive
prearrangement
At the diesel fuel or diesel
fuel/steering oil
The sea water intake circuit connection must be made as in
Figure 22 below:
Figure 22 - Sea water intake connection
The intake pipe must go from the sea water intake to the filter
(not supplied as standard), then to the engine intake flange.
Use only rubber hoses of suitable thickness to prevent
breakage. Ensure that the pipe touches the moving parts of
the engine. Fasten the pipe with metal clamps.
Figure 23 - Sea water intake
Make sure that between the sea water intake and the sea
water filter there is a shut-off valve of the pipe and that no
point of the circuit is less than the minimum diameter indicated
in the tables above.
The water filter and the size of all the pipes of the sea water
system must ensure the minimum flow rate required for
operation of the engine.
Failure to comply with the requirements of this
chapter involves damage to the engine and will void
the engine warranty.
In the case of stern drive installations, it is mandatory to install
an additional sea water intake: the sea water intake on the
transom of the stern drive can easily become clogged leading
to a lack of engine cooling.
The absence of double sea water intake in case of
stern drive installation may void the warranty.
Refer to the diagram in the following figure to connect the
double sea water intake in case of stern drive installations. In
the junction of two circuits, use a T shape fitting.
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