Raw Water System - Nanni T4.205 Operator's Manual

Raw water system

I DANGER
When the boat is in the water,
water can flow into the boat via
components located below the
waterline. Close the raw water
cock (if fitted) or prevent water
discharge before working on this
raw water system.
The raw water system allows to
cool the engine coolant and the
exhaust gas.
Raw water is drawn into the heat
exchanger by the raw water pump
of the engine. The raw water is
discharged via the exhaust elbow,
where it is mixed with exhaust
gases.
NOTICE: If there's any risk of
frost, raw water system should be
drained.
47
Siphon breaker
I DANGER
Close the sea cock before any
operation on the siphon breaker.
NOTICE: The use of a siphon
breaker is mandatory if the exhaust
elbow is under the waterline at full
load or at less than 200 mm above
it. A siphon breaker is mandatory in
all Sail Boat and when there's a risk
of water entry in the engine.
The siphon breaker prevents raw
water entry into the cylinders via
the raw water/exhaust system.
To operate correctly, the siphon
breaker should clean twice a sea-
son, or when leakage appears.
I CAUTION
A faulty operation of the siphon
breaker will lead to water entry in
the engine.
Inspect it regularly and clean it fol-
lowing the instructions given by the
manufacturer.