- 21
MARINER
1800-2100-2400-2700-2500T-3000T-3400T
GB
GB
1
2
3.5 C
OOLING
WATER
CIRCUIT
The engine is cooled by a closed system circuit with
water and antifreeze mixture.
Coolant is maintained to optimal temperature through the
generator water / water cooler. Inside water / water cooler
there is a thermal exchange between engine liquid and
seawater (or other cooled liquid, for example coming from
a keel cooler).
During the installation it is necessary to predispose a
suitable circuit for water inlet and outlet from generator
group.
3.5.1 S
EAWATER
FEED
SYSTEM
(
IF
USE
SEAWATER
FOR
COOLING
)
Two water intake systems are normally adopted on boats:
-Direct intake system (
ref.1
).
-System with baffle (
ref.2
).
ma
s
e
recommends using the direct intake system
(
ref.1
), since it prevents intake of pressurised water into
the intake ducts, instead generating a vacuum easily
overcome by the water pump head of the generator.
Do not fit any type of protection cap on the direct
intake system.
The system with baffle (
ref.2
), on the other hand, may
cause the following problems:
a
- If mounted with the slots facing the bow:
In this case, during navigation and with the generator
off, pressure is created in the water intake duct, which
may cause the system to fill up until reaching the exhaust
port, thus making it possible for water to enter the
cylinders.
b
- If mounted with the slots facing the stern:
In this case, during navigation a vacuum may be created
in the water intake duct such as to inhibit the water pump
to activate the cooling system or such as to limit the flow
rate with consequent overheating of the generator.
