Nanni N4.65 User Manual

42
S07 STARTING & RUNNING
BEFORE STARTING
ENGINE INSTALLATION
See Installation manual
FUEL SYSTEM
The fuel is drawn from the tank by the fuel feed pump
and is injected into the combustion chamber by the
injection pump. A fuel lter is placed between the feed
pump and the injection pump.
The injection pump delivers a larger amount of fuel than
required for combustion. The fuel that is not burned is
re-injected into the tank through an over-flow pipe.
CAUTION !
The injection pump is an extremely precise unit. Water
entry in the fuel system will cause major failure to the
injection pump and to the whole fuel system.
A fuel prelter with a water separator should be installed
between the fuel tank and the fuel lter on the engine.
The prelter should be installed as close as possible to
the engine fuel lter. It must never be installed on the
engine as vibrations affect the water/fuel separation
process.
If the fuel tank is located below the engine injection
pump, an additional electric fuel feed pump should be
installed between the prelter and the feed pump of the
engine.
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
engine raw water pump. The raw water is drained via the
exhaust elbow, where it is mixed with exhaust gases.
The siphon breaker prevents raw water entry into the
cylinders via the raw water/exhaust system.
NOTE !
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.
A raw water lter must be tted between the raw water
intake and the raw water pump of the engine.
ELECTRICAL SYSTEM
The engine extension harness should be away from any
water projection and must be correctly attached as high
as possible in the hold.
Engines in metallic hulls are generally tted with a two-
pole electrical system. This system allows to electrically
isolate the engine from the electrical ground of the boat.
The alternator belt drives both the coolant pump and the
alternator. Additional belt can also be tted.

Nanni N4.65 Specifications

General

Brand	Nanni
Model	N4.65
Category	Engine
Language	English